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Make WordPress Core

Changeset 33751


Ignore:
Timestamp:
08/26/2015 04:41:29 AM (5 years ago)
Author:
wonderboymusic
Message:

Rewrite: move WP_Rewrite into its own file. rewrite.php loads the new files, so this is 100% BC if someone is loading rewrite.php directly. New files created using svn cp.

The rewrite functions have all kinds of cross-dependencies (like WP_Query), so loading the file by itself would have been bizarre (and still is).

Creates:
rewrite-constants.php
rewrite-functions.php
class-wp-rewrite.php

rewrite.php contains only top-level code. Class file only contains the class. Functions file only contains functions.

See #33413.

Location:
trunk/src/wp-includes
Files:
1 edited
3 copied

Legend:

Unmodified
Added
Removed
  • trunk/src/wp-includes/class-wp-rewrite.php

    r33746 r33751  
    11<?php
    2 /**
    3  * WordPress Rewrite API
    4  *
    5  * @package WordPress
    6  * @subpackage Rewrite
    7  */
    8 
    9 /**
    10  * Add a straight rewrite rule.
    11  *
    12  * @since 2.1.0
    13  *
    14  * @global WP_Rewrite $wp_rewrite
    15  *
    16  * @param string $regex    Regular Expression to match request against.
    17  * @param string $redirect Page to redirect to.
    18  * @param string $after    Optional, default is 'bottom'. Where to add rule, can also be 'top'.
    19  */
    20 function add_rewrite_rule($regex, $redirect, $after = 'bottom') {
    21     global $wp_rewrite;
    22     $wp_rewrite->add_rule($regex, $redirect, $after);
    23 }
    24 
    25 /**
    26  * Add a new rewrite tag (like %postname%).
    27  *
    28  * The $query parameter is optional. If it is omitted you must ensure that
    29  * you call this on, or before, the 'init' hook. This is because $query defaults
    30  * to "$tag=", and for this to work a new query var has to be added.
    31  *
    32  * @since 2.1.0
    33  *
    34  * @global WP_Rewrite $wp_rewrite
    35  * @global WP         $wp
    36  *
    37  * @param string $tag   Name of the new rewrite tag.
    38  * @param string $regex Regular expression to substitute the tag for in rewrite rules.
    39  * @param string $query String to append to the rewritten query. Must end in '='. Optional.
    40  */
    41 function add_rewrite_tag( $tag, $regex, $query = '' ) {
    42     // validate the tag's name
    43     if ( strlen( $tag ) < 3 || $tag[0] != '%' || $tag[ strlen($tag) - 1 ] != '%' )
    44         return;
    45 
    46     global $wp_rewrite, $wp;
    47 
    48     if ( empty( $query ) ) {
    49         $qv = trim( $tag, '%' );
    50         $wp->add_query_var( $qv );
    51         $query = $qv . '=';
    52     }
    53 
    54     $wp_rewrite->add_rewrite_tag( $tag, $regex, $query );
    55 }
    56 
    57 /**
    58  * Add permalink structure.
    59  *
    60  * @since 3.0.0
    61  *
    62  * @global WP_Rewrite $wp_rewrite
    63  *
    64  * @param string $name   Name for permalink structure.
    65  * @param string $struct Permalink structure.
    66  * @param array  $args   Optional configuration for building the rules from the permalink structure,
    67  *                       see {@link WP_Rewrite::add_permastruct()} for full details.
    68  */
    69 function add_permastruct( $name, $struct, $args = array() ) {
    70     global $wp_rewrite;
    71 
    72     // backwards compatibility for the old parameters: $with_front and $ep_mask
    73     if ( ! is_array( $args ) )
    74         $args = array( 'with_front' => $args );
    75     if ( func_num_args() == 4 )
    76         $args['ep_mask'] = func_get_arg( 3 );
    77 
    78     $wp_rewrite->add_permastruct( $name, $struct, $args );
    79 }
    80 
    81 /**
    82  * Add a new feed type like /atom1/.
    83  *
    84  * @since 2.1.0
    85  *
    86  * @global WP_Rewrite $wp_rewrite
    87  *
    88  * @param string   $feedname
    89  * @param callback $function Callback to run on feed display.
    90  * @return string Feed action name.
    91  */
    92 function add_feed($feedname, $function) {
    93     global $wp_rewrite;
    94     if ( ! in_array($feedname, $wp_rewrite->feeds) ) //override the file if it is
    95         $wp_rewrite->feeds[] = $feedname;
    96     $hook = 'do_feed_' . $feedname;
    97     // Remove default function hook
    98     remove_action($hook, $hook);
    99     add_action($hook, $function, 10, 1);
    100     return $hook;
    101 }
    102 
    103 /**
    104  * Remove rewrite rules and then recreate rewrite rules.
    105  *
    106  * @since 3.0.0
    107  *
    108  * @global WP_Rewrite $wp_rewrite
    109  *
    110  * @param bool $hard Whether to update .htaccess (hard flush) or just update
    111  *                   rewrite_rules transient (soft flush). Default is true (hard).
    112  */
    113 function flush_rewrite_rules( $hard = true ) {
    114     global $wp_rewrite;
    115     $wp_rewrite->flush_rules( $hard );
    116 }
    117 
    118 /**
    119  * Endpoint Mask for default, which is nothing.
    120  *
    121  * @since 2.1.0
    122  */
    123 define('EP_NONE', 0);
    124 
    125 /**
    126  * Endpoint Mask for Permalink.
    127  *
    128  * @since 2.1.0
    129  */
    130 define('EP_PERMALINK', 1);
    131 
    132 /**
    133  * Endpoint Mask for Attachment.
    134  *
    135  * @since 2.1.0
    136  */
    137 define('EP_ATTACHMENT', 2);
    138 
    139 /**
    140  * Endpoint Mask for date.
    141  *
    142  * @since 2.1.0
    143  */
    144 define('EP_DATE', 4);
    145 
    146 /**
    147  * Endpoint Mask for year
    148  *
    149  * @since 2.1.0
    150  */
    151 define('EP_YEAR', 8);
    152 
    153 /**
    154  * Endpoint Mask for month.
    155  *
    156  * @since 2.1.0
    157  */
    158 define('EP_MONTH', 16);
    159 
    160 /**
    161  * Endpoint Mask for day.
    162  *
    163  * @since 2.1.0
    164  */
    165 define('EP_DAY', 32);
    166 
    167 /**
    168  * Endpoint Mask for root.
    169  *
    170  * @since 2.1.0
    171  */
    172 define('EP_ROOT', 64);
    173 
    174 /**
    175  * Endpoint Mask for comments.
    176  *
    177  * @since 2.1.0
    178  */
    179 define('EP_COMMENTS', 128);
    180 
    181 /**
    182  * Endpoint Mask for searches.
    183  *
    184  * @since 2.1.0
    185  */
    186 define('EP_SEARCH', 256);
    187 
    188 /**
    189  * Endpoint Mask for categories.
    190  *
    191  * @since 2.1.0
    192  */
    193 define('EP_CATEGORIES', 512);
    194 
    195 /**
    196  * Endpoint Mask for tags.
    197  *
    198  * @since 2.3.0
    199  */
    200 define('EP_TAGS', 1024);
    201 
    202 /**
    203  * Endpoint Mask for authors.
    204  *
    205  * @since 2.1.0
    206  */
    207 define('EP_AUTHORS', 2048);
    208 
    209 /**
    210  * Endpoint Mask for pages.
    211  *
    212  * @since 2.1.0
    213  */
    214 define('EP_PAGES', 4096);
    215 
    216 /**
    217  * Endpoint Mask for all archive views.
    218  *
    219  * @since 3.7.0
    220  */
    221 define( 'EP_ALL_ARCHIVES', EP_DATE | EP_YEAR | EP_MONTH | EP_DAY | EP_CATEGORIES | EP_TAGS | EP_AUTHORS );
    222 
    223 /**
    224  * Endpoint Mask for everything.
    225  *
    226  * @since 2.1.0
    227  */
    228 define( 'EP_ALL', EP_PERMALINK | EP_ATTACHMENT | EP_ROOT | EP_COMMENTS | EP_SEARCH | EP_PAGES | EP_ALL_ARCHIVES );
    229 
    230 /**
    231  * Add an endpoint, like /trackback/.
    232  *
    233  * Adding an endpoint creates extra rewrite rules for each of the matching
    234  * places specified by the provided bitmask. For example:
    235  *
    236  *     add_rewrite_endpoint( 'json', EP_PERMALINK | EP_PAGES );
    237  *
    238  * will add a new rewrite rule ending with "json(/(.*))?/?$" for every permastruct
    239  * that describes a permalink (post) or page. This is rewritten to "json=$match"
    240  * where $match is the part of the URL matched by the endpoint regex (e.g. "foo" in
    241  * "[permalink]/json/foo/").
    242  *
    243  * A new query var with the same name as the endpoint will also be created.
    244  *
    245  * When specifying $places ensure that you are using the EP_* constants (or a
    246  * combination of them using the bitwise OR operator) as their values are not
    247  * guaranteed to remain static (especially `EP_ALL`).
    248  *
    249  * Be sure to flush the rewrite rules - see flush_rewrite_rules() - when your plugin gets
    250  * activated and deactivated.
    251  *
    252  * @since 2.1.0
    253  * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
    254  *
    255  * @global WP_Rewrite $wp_rewrite
    256  *
    257  * @param string      $name      Name of the endpoint.
    258  * @param int         $places    Endpoint mask describing the places the endpoint should be added.
    259  * @param string|bool $query_var Name of the corresponding query variable. Pass `false` to skip registering a query_var
    260  *                               for this endpoint. Defaults to the value of `$name`.
    261  */
    262 function add_rewrite_endpoint( $name, $places, $query_var = true ) {
    263     global $wp_rewrite;
    264     $wp_rewrite->add_endpoint( $name, $places, $query_var );
    265 }
    266 
    267 /**
    268  * Filter the URL base for taxonomies.
    269  *
    270  * To remove any manually prepended /index.php/.
    271  *
    272  * @access private
    273  * @since 2.6.0
    274  *
    275  * @param string $base The taxonomy base that we're going to filter
    276  * @return string
    277  */
    278 function _wp_filter_taxonomy_base( $base ) {
    279     if ( !empty( $base ) ) {
    280         $base = preg_replace( '|^/index\.php/|', '', $base );
    281         $base = trim( $base, '/' );
    282     }
    283     return $base;
    284 }
    285 
    286 
    287 /**
    288  * Resolve numeric slugs that collide with date permalinks.
    289  *
    290  * Permalinks of posts with numeric slugs can sometimes look to WP_Query::parse_query()
    291  * like a date archive, as when your permalink structure is `/%year%/%postname%/` and
    292  * a post with post_name '05' has the URL `/2015/05/`.
    293  *
    294  * This function detects conflicts of this type and resolves them in favor of the
    295  * post permalink.
    296  *
    297  * Note that, since 4.3.0, wp_unique_post_slug() prevents the creation of post slugs
    298  * that would result in a date archive conflict. The resolution performed in this
    299  * function is primarily for legacy content, as well as cases when the admin has changed
    300  * the site's permalink structure in a way that introduces URL conflicts.
    301  *
    302  * @since 4.3.0
    303  *
    304  * @param array $query_vars Optional. Query variables for setting up the loop, as determined in
    305  *                          WP::parse_request(). Default empty array.
    306  * @return array Returns the original array of query vars, with date/post conflicts resolved.
    307  */
    308 function wp_resolve_numeric_slug_conflicts( $query_vars = array() ) {
    309     if ( ! isset( $query_vars['year'] ) && ! isset( $query_vars['monthnum'] ) && ! isset( $query_vars['day'] ) ) {
    310         return $query_vars;
    311     }
    312 
    313     // Identify the 'postname' position in the permastruct array.
    314     $permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
    315     $postname_index = array_search( '%postname%', $permastructs );
    316 
    317     if ( false === $postname_index ) {
    318         return $query_vars;
    319     }
    320 
    321     /*
    322      * A numeric slug could be confused with a year, month, or day, depending on position. To account for
    323      * the possibility of post pagination (eg 2015/2 for the second page of a post called '2015'), our
    324      * `is_*` checks are generous: check for year-slug clashes when `is_year` *or* `is_month`, and check
    325      * for month-slug clashes when `is_month` *or* `is_day`.
    326      */
    327     $compare = '';
    328     if ( 0 === $postname_index && ( isset( $query_vars['year'] ) || isset( $query_vars['monthnum'] ) ) ) {
    329         $compare = 'year';
    330     } elseif ( '%year%' === $permastructs[ $postname_index - 1 ] && ( isset( $query_vars['monthnum'] ) || isset( $query_vars['day'] ) ) ) {
    331         $compare = 'monthnum';
    332     } elseif ( '%monthnum%' === $permastructs[ $postname_index - 1 ] && isset( $query_vars['day'] ) ) {
    333         $compare = 'day';
    334     }
    335 
    336     if ( ! $compare ) {
    337         return $query_vars;
    338     }
    339 
    340     // This is the potentially clashing slug.
    341     $value = $query_vars[ $compare ];
    342 
    343     $post = get_page_by_path( $value, OBJECT, 'post' );
    344     if ( ! ( $post instanceof WP_Post ) ) {
    345         return $query_vars;
    346     }
    347 
    348     // If the date of the post doesn't match the date specified in the URL, resolve to the date archive.
    349     if ( preg_match( '/^([0-9]{4})\-([0-9]{2})/', $post->post_date, $matches ) && isset( $query_vars['year'] ) && ( 'monthnum' === $compare || 'day' === $compare ) ) {
    350         // $matches[1] is the year the post was published.
    351         if ( intval( $query_vars['year'] ) !== intval( $matches[1] ) ) {
    352             return $query_vars;
    353         }
    354 
    355         // $matches[2] is the month the post was published.
    356         if ( 'day' === $compare && isset( $query_vars['monthnum'] ) && intval( $query_vars['monthnum'] ) !== intval( $matches[2] ) ) {
    357             return $query_vars;
    358         }
    359     }
    360 
    361     /*
    362      * If the located post contains nextpage pagination, then the URL chunk following postname may be
    363      * intended as the page number. Verify that it's a valid page before resolving to it.
    364      */
    365     $maybe_page = '';
    366     if ( 'year' === $compare && isset( $query_vars['monthnum'] ) ) {
    367         $maybe_page = $query_vars['monthnum'];
    368     } elseif ( 'monthnum' === $compare && isset( $query_vars['day'] ) ) {
    369         $maybe_page = $query_vars['day'];
    370     }
    371 
    372     $post_page_count = substr_count( $post->post_content, '<!--nextpage-->' ) + 1;
    373 
    374     // If the post doesn't have multiple pages, but a 'page' candidate is found, resolve to the date archive.
    375     if ( 1 === $post_page_count && $maybe_page ) {
    376         return $query_vars;
    377     }
    378 
    379     // If the post has multiple pages and the 'page' number isn't valid, resolve to the date archive.
    380     if ( $post_page_count > 1 && $maybe_page > $post_page_count ) {
    381         return $query_vars;
    382     }
    383 
    384     // If we've gotten to this point, we have a slug/date clash. First, adjust for nextpage.
    385     if ( '' !== $maybe_page ) {
    386         $query_vars['page'] = intval( $maybe_page );
    387     }
    388 
    389     // Next, unset autodetected date-related query vars.
    390     unset( $query_vars['year'] );
    391     unset( $query_vars['monthnum'] );
    392     unset( $query_vars['day'] );
    393 
    394     // Then, set the identified post.
    395     $query_vars['name'] = $post->post_name;
    396 
    397     // Finally, return the modified query vars.
    398     return $query_vars;
    399 }
    400 
    401 /**
    402  * Examine a url and try to determine the post ID it represents.
    403  *
    404  * Checks are supposedly from the hosted site blog.
    405  *
    406  * @since 1.0.0
    407  *
    408  * @global WP_Rewrite $wp_rewrite
    409  * @global WP         $wp
    410  *
    411  * @param string $url Permalink to check.
    412  * @return int Post ID, or 0 on failure.
    413  */
    414 function url_to_postid( $url ) {
    415     global $wp_rewrite;
    416 
    417     /**
    418      * Filter the URL to derive the post ID from.
    419      *
    420      * @since 2.2.0
    421      *
    422      * @param string $url The URL to derive the post ID from.
    423      */
    424     $url = apply_filters( 'url_to_postid', $url );
    425 
    426     // First, check to see if there is a 'p=N' or 'page_id=N' to match against
    427     if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) )   {
    428         $id = absint($values[2]);
    429         if ( $id )
    430             return $id;
    431     }
    432 
    433     // Check to see if we are using rewrite rules
    434     $rewrite = $wp_rewrite->wp_rewrite_rules();
    435 
    436     // Not using rewrite rules, and 'p=N' and 'page_id=N' methods failed, so we're out of options
    437     if ( empty($rewrite) )
    438         return 0;
    439 
    440     // Get rid of the #anchor
    441     $url_split = explode('#', $url);
    442     $url = $url_split[0];
    443 
    444     // Get rid of URL ?query=string
    445     $url_split = explode('?', $url);
    446     $url = $url_split[0];
    447 
    448     // Add 'www.' if it is absent and should be there
    449     if ( false !== strpos(home_url(), '://www.') && false === strpos($url, '://www.') )
    450         $url = str_replace('://', '://www.', $url);
    451 
    452     // Strip 'www.' if it is present and shouldn't be
    453     if ( false === strpos(home_url(), '://www.') )
    454         $url = str_replace('://www.', '://', $url);
    455 
    456     // Strip 'index.php/' if we're not using path info permalinks
    457     if ( !$wp_rewrite->using_index_permalinks() )
    458         $url = str_replace( $wp_rewrite->index . '/', '', $url );
    459 
    460     if ( false !== strpos( trailingslashit( $url ), home_url( '/' ) ) ) {
    461         // Chop off http://domain.com/[path]
    462         $url = str_replace(home_url(), '', $url);
    463     } else {
    464         // Chop off /path/to/blog
    465         $home_path = parse_url( home_url( '/' ) );
    466         $home_path = isset( $home_path['path'] ) ? $home_path['path'] : '' ;
    467         $url = preg_replace( sprintf( '#^%s#', preg_quote( $home_path ) ), '', trailingslashit( $url ) );
    468     }
    469 
    470     // Trim leading and lagging slashes
    471     $url = trim($url, '/');
    472 
    473     $request = $url;
    474     $post_type_query_vars = array();
    475 
    476     foreach ( get_post_types( array() , 'objects' ) as $post_type => $t ) {
    477         if ( ! empty( $t->query_var ) )
    478             $post_type_query_vars[ $t->query_var ] = $post_type;
    479     }
    480 
    481     // Look for matches.
    482     $request_match = $request;
    483     foreach ( (array)$rewrite as $match => $query) {
    484 
    485         // If the requesting file is the anchor of the match, prepend it
    486         // to the path info.
    487         if ( !empty($url) && ($url != $request) && (strpos($match, $url) === 0) )
    488             $request_match = $url . '/' . $request;
    489 
    490         if ( preg_match("#^$match#", $request_match, $matches) ) {
    491 
    492             if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {
    493                 // This is a verbose page match, let's check to be sure about it.
    494                 if ( ! get_page_by_path( $matches[ $varmatch[1] ] ) )
    495                     continue;
    496             }
    497 
    498             // Got a match.
    499             // Trim the query of everything up to the '?'.
    500             $query = preg_replace("!^.+\?!", '', $query);
    501 
    502             // Substitute the substring matches into the query.
    503             $query = addslashes(WP_MatchesMapRegex::apply($query, $matches));
    504 
    505             // Filter out non-public query vars
    506             global $wp;
    507             parse_str( $query, $query_vars );
    508             $query = array();
    509             foreach ( (array) $query_vars as $key => $value ) {
    510                 if ( in_array( $key, $wp->public_query_vars ) ){
    511                     $query[$key] = $value;
    512                     if ( isset( $post_type_query_vars[$key] ) ) {
    513                         $query['post_type'] = $post_type_query_vars[$key];
    514                         $query['name'] = $value;
    515                     }
    516                 }
    517             }
    518 
    519             // Resolve conflicts between posts with numeric slugs and date archive queries.
    520             $query = wp_resolve_numeric_slug_conflicts( $query );
    521 
    522             // Do the query
    523             $query = new WP_Query( $query );
    524             if ( ! empty( $query->posts ) && $query->is_singular )
    525                 return $query->post->ID;
    526             else
    527                 return 0;
    528         }
    529     }
    530     return 0;
    531 }
    532 
    5332/**
    5343 * WordPress Rewrite Component.
     
    54514 *
    54615 * @since 1.5.0
     16 * @package WordPress
     17 * @subpackage Rewrite
    54718 */
    54819class WP_Rewrite {
  • trunk/src/wp-includes/rewrite-constants.php

    r33746 r33751  
    66 * @subpackage Rewrite
    77 */
    8 
    9 /**
    10  * Add a straight rewrite rule.
    11  *
    12  * @since 2.1.0
    13  *
    14  * @global WP_Rewrite $wp_rewrite
    15  *
    16  * @param string $regex    Regular Expression to match request against.
    17  * @param string $redirect Page to redirect to.
    18  * @param string $after    Optional, default is 'bottom'. Where to add rule, can also be 'top'.
    19  */
    20 function add_rewrite_rule($regex, $redirect, $after = 'bottom') {
    21     global $wp_rewrite;
    22     $wp_rewrite->add_rule($regex, $redirect, $after);
    23 }
    24 
    25 /**
    26  * Add a new rewrite tag (like %postname%).
    27  *
    28  * The $query parameter is optional. If it is omitted you must ensure that
    29  * you call this on, or before, the 'init' hook. This is because $query defaults
    30  * to "$tag=", and for this to work a new query var has to be added.
    31  *
    32  * @since 2.1.0
    33  *
    34  * @global WP_Rewrite $wp_rewrite
    35  * @global WP         $wp
    36  *
    37  * @param string $tag   Name of the new rewrite tag.
    38  * @param string $regex Regular expression to substitute the tag for in rewrite rules.
    39  * @param string $query String to append to the rewritten query. Must end in '='. Optional.
    40  */
    41 function add_rewrite_tag( $tag, $regex, $query = '' ) {
    42     // validate the tag's name
    43     if ( strlen( $tag ) < 3 || $tag[0] != '%' || $tag[ strlen($tag) - 1 ] != '%' )
    44         return;
    45 
    46     global $wp_rewrite, $wp;
    47 
    48     if ( empty( $query ) ) {
    49         $qv = trim( $tag, '%' );
    50         $wp->add_query_var( $qv );
    51         $query = $qv . '=';
    52     }
    53 
    54     $wp_rewrite->add_rewrite_tag( $tag, $regex, $query );
    55 }
    56 
    57 /**
    58  * Add permalink structure.
    59  *
    60  * @since 3.0.0
    61  *
    62  * @global WP_Rewrite $wp_rewrite
    63  *
    64  * @param string $name   Name for permalink structure.
    65  * @param string $struct Permalink structure.
    66  * @param array  $args   Optional configuration for building the rules from the permalink structure,
    67  *                       see {@link WP_Rewrite::add_permastruct()} for full details.
    68  */
    69 function add_permastruct( $name, $struct, $args = array() ) {
    70     global $wp_rewrite;
    71 
    72     // backwards compatibility for the old parameters: $with_front and $ep_mask
    73     if ( ! is_array( $args ) )
    74         $args = array( 'with_front' => $args );
    75     if ( func_num_args() == 4 )
    76         $args['ep_mask'] = func_get_arg( 3 );
    77 
    78     $wp_rewrite->add_permastruct( $name, $struct, $args );
    79 }
    80 
    81 /**
    82  * Add a new feed type like /atom1/.
    83  *
    84  * @since 2.1.0
    85  *
    86  * @global WP_Rewrite $wp_rewrite
    87  *
    88  * @param string   $feedname
    89  * @param callback $function Callback to run on feed display.
    90  * @return string Feed action name.
    91  */
    92 function add_feed($feedname, $function) {
    93     global $wp_rewrite;
    94     if ( ! in_array($feedname, $wp_rewrite->feeds) ) //override the file if it is
    95         $wp_rewrite->feeds[] = $feedname;
    96     $hook = 'do_feed_' . $feedname;
    97     // Remove default function hook
    98     remove_action($hook, $hook);
    99     add_action($hook, $function, 10, 1);
    100     return $hook;
    101 }
    102 
    103 /**
    104  * Remove rewrite rules and then recreate rewrite rules.
    105  *
    106  * @since 3.0.0
    107  *
    108  * @global WP_Rewrite $wp_rewrite
    109  *
    110  * @param bool $hard Whether to update .htaccess (hard flush) or just update
    111  *                   rewrite_rules transient (soft flush). Default is true (hard).
    112  */
    113 function flush_rewrite_rules( $hard = true ) {
    114     global $wp_rewrite;
    115     $wp_rewrite->flush_rules( $hard );
    116 }
    1178
    1189/**
     
    227118 */
    228119define( 'EP_ALL', EP_PERMALINK | EP_ATTACHMENT | EP_ROOT | EP_COMMENTS | EP_SEARCH | EP_PAGES | EP_ALL_ARCHIVES );
    229 
    230 /**
    231  * Add an endpoint, like /trackback/.
    232  *
    233  * Adding an endpoint creates extra rewrite rules for each of the matching
    234  * places specified by the provided bitmask. For example:
    235  *
    236  *     add_rewrite_endpoint( 'json', EP_PERMALINK | EP_PAGES );
    237  *
    238  * will add a new rewrite rule ending with "json(/(.*))?/?$" for every permastruct
    239  * that describes a permalink (post) or page. This is rewritten to "json=$match"
    240  * where $match is the part of the URL matched by the endpoint regex (e.g. "foo" in
    241  * "[permalink]/json/foo/").
    242  *
    243  * A new query var with the same name as the endpoint will also be created.
    244  *
    245  * When specifying $places ensure that you are using the EP_* constants (or a
    246  * combination of them using the bitwise OR operator) as their values are not
    247  * guaranteed to remain static (especially `EP_ALL`).
    248  *
    249  * Be sure to flush the rewrite rules - see flush_rewrite_rules() - when your plugin gets
    250  * activated and deactivated.
    251  *
    252  * @since 2.1.0
    253  * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
    254  *
    255  * @global WP_Rewrite $wp_rewrite
    256  *
    257  * @param string      $name      Name of the endpoint.
    258  * @param int         $places    Endpoint mask describing the places the endpoint should be added.
    259  * @param string|bool $query_var Name of the corresponding query variable. Pass `false` to skip registering a query_var
    260  *                               for this endpoint. Defaults to the value of `$name`.
    261  */
    262 function add_rewrite_endpoint( $name, $places, $query_var = true ) {
    263     global $wp_rewrite;
    264     $wp_rewrite->add_endpoint( $name, $places, $query_var );
    265 }
    266 
    267 /**
    268  * Filter the URL base for taxonomies.
    269  *
    270  * To remove any manually prepended /index.php/.
    271  *
    272  * @access private
    273  * @since 2.6.0
    274  *
    275  * @param string $base The taxonomy base that we're going to filter
    276  * @return string
    277  */
    278 function _wp_filter_taxonomy_base( $base ) {
    279     if ( !empty( $base ) ) {
    280         $base = preg_replace( '|^/index\.php/|', '', $base );
    281         $base = trim( $base, '/' );
    282     }
    283     return $base;
    284 }
    285 
    286 
    287 /**
    288  * Resolve numeric slugs that collide with date permalinks.
    289  *
    290  * Permalinks of posts with numeric slugs can sometimes look to WP_Query::parse_query()
    291  * like a date archive, as when your permalink structure is `/%year%/%postname%/` and
    292  * a post with post_name '05' has the URL `/2015/05/`.
    293  *
    294  * This function detects conflicts of this type and resolves them in favor of the
    295  * post permalink.
    296  *
    297  * Note that, since 4.3.0, wp_unique_post_slug() prevents the creation of post slugs
    298  * that would result in a date archive conflict. The resolution performed in this
    299  * function is primarily for legacy content, as well as cases when the admin has changed
    300  * the site's permalink structure in a way that introduces URL conflicts.
    301  *
    302  * @since 4.3.0
    303  *
    304  * @param array $query_vars Optional. Query variables for setting up the loop, as determined in
    305  *                          WP::parse_request(). Default empty array.
    306  * @return array Returns the original array of query vars, with date/post conflicts resolved.
    307  */
    308 function wp_resolve_numeric_slug_conflicts( $query_vars = array() ) {
    309     if ( ! isset( $query_vars['year'] ) && ! isset( $query_vars['monthnum'] ) && ! isset( $query_vars['day'] ) ) {
    310         return $query_vars;
    311     }
    312 
    313     // Identify the 'postname' position in the permastruct array.
    314     $permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
    315     $postname_index = array_search( '%postname%', $permastructs );
    316 
    317     if ( false === $postname_index ) {
    318         return $query_vars;
    319     }
    320 
    321     /*
    322      * A numeric slug could be confused with a year, month, or day, depending on position. To account for
    323      * the possibility of post pagination (eg 2015/2 for the second page of a post called '2015'), our
    324      * `is_*` checks are generous: check for year-slug clashes when `is_year` *or* `is_month`, and check
    325      * for month-slug clashes when `is_month` *or* `is_day`.
    326      */
    327     $compare = '';
    328     if ( 0 === $postname_index && ( isset( $query_vars['year'] ) || isset( $query_vars['monthnum'] ) ) ) {
    329         $compare = 'year';
    330     } elseif ( '%year%' === $permastructs[ $postname_index - 1 ] && ( isset( $query_vars['monthnum'] ) || isset( $query_vars['day'] ) ) ) {
    331         $compare = 'monthnum';
    332     } elseif ( '%monthnum%' === $permastructs[ $postname_index - 1 ] && isset( $query_vars['day'] ) ) {
    333         $compare = 'day';
    334     }
    335 
    336     if ( ! $compare ) {
    337         return $query_vars;
    338     }
    339 
    340     // This is the potentially clashing slug.
    341     $value = $query_vars[ $compare ];
    342 
    343     $post = get_page_by_path( $value, OBJECT, 'post' );
    344     if ( ! ( $post instanceof WP_Post ) ) {
    345         return $query_vars;
    346     }
    347 
    348     // If the date of the post doesn't match the date specified in the URL, resolve to the date archive.
    349     if ( preg_match( '/^([0-9]{4})\-([0-9]{2})/', $post->post_date, $matches ) && isset( $query_vars['year'] ) && ( 'monthnum' === $compare || 'day' === $compare ) ) {
    350         // $matches[1] is the year the post was published.
    351         if ( intval( $query_vars['year'] ) !== intval( $matches[1] ) ) {
    352             return $query_vars;
    353         }
    354 
    355         // $matches[2] is the month the post was published.
    356         if ( 'day' === $compare && isset( $query_vars['monthnum'] ) && intval( $query_vars['monthnum'] ) !== intval( $matches[2] ) ) {
    357             return $query_vars;
    358         }
    359     }
    360 
    361     /*
    362      * If the located post contains nextpage pagination, then the URL chunk following postname may be
    363      * intended as the page number. Verify that it's a valid page before resolving to it.
    364      */
    365     $maybe_page = '';
    366     if ( 'year' === $compare && isset( $query_vars['monthnum'] ) ) {
    367         $maybe_page = $query_vars['monthnum'];
    368     } elseif ( 'monthnum' === $compare && isset( $query_vars['day'] ) ) {
    369         $maybe_page = $query_vars['day'];
    370     }
    371 
    372     $post_page_count = substr_count( $post->post_content, '<!--nextpage-->' ) + 1;
    373 
    374     // If the post doesn't have multiple pages, but a 'page' candidate is found, resolve to the date archive.
    375     if ( 1 === $post_page_count && $maybe_page ) {
    376         return $query_vars;
    377     }
    378 
    379     // If the post has multiple pages and the 'page' number isn't valid, resolve to the date archive.
    380     if ( $post_page_count > 1 && $maybe_page > $post_page_count ) {
    381         return $query_vars;
    382     }
    383 
    384     // If we've gotten to this point, we have a slug/date clash. First, adjust for nextpage.
    385     if ( '' !== $maybe_page ) {
    386         $query_vars['page'] = intval( $maybe_page );
    387     }
    388 
    389     // Next, unset autodetected date-related query vars.
    390     unset( $query_vars['year'] );
    391     unset( $query_vars['monthnum'] );
    392     unset( $query_vars['day'] );
    393 
    394     // Then, set the identified post.
    395     $query_vars['name'] = $post->post_name;
    396 
    397     // Finally, return the modified query vars.
    398     return $query_vars;
    399 }
    400 
    401 /**
    402  * Examine a url and try to determine the post ID it represents.
    403  *
    404  * Checks are supposedly from the hosted site blog.
    405  *
    406  * @since 1.0.0
    407  *
    408  * @global WP_Rewrite $wp_rewrite
    409  * @global WP         $wp
    410  *
    411  * @param string $url Permalink to check.
    412  * @return int Post ID, or 0 on failure.
    413  */
    414 function url_to_postid( $url ) {
    415     global $wp_rewrite;
    416 
    417     /**
    418      * Filter the URL to derive the post ID from.
    419      *
    420      * @since 2.2.0
    421      *
    422      * @param string $url The URL to derive the post ID from.
    423      */
    424     $url = apply_filters( 'url_to_postid', $url );
    425 
    426     // First, check to see if there is a 'p=N' or 'page_id=N' to match against
    427     if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) )   {
    428         $id = absint($values[2]);
    429         if ( $id )
    430             return $id;
    431     }
    432 
    433     // Check to see if we are using rewrite rules
    434     $rewrite = $wp_rewrite->wp_rewrite_rules();
    435 
    436     // Not using rewrite rules, and 'p=N' and 'page_id=N' methods failed, so we're out of options
    437     if ( empty($rewrite) )
    438         return 0;
    439 
    440     // Get rid of the #anchor
    441     $url_split = explode('#', $url);
    442     $url = $url_split[0];
    443 
    444     // Get rid of URL ?query=string
    445     $url_split = explode('?', $url);
    446     $url = $url_split[0];
    447 
    448     // Add 'www.' if it is absent and should be there
    449     if ( false !== strpos(home_url(), '://www.') && false === strpos($url, '://www.') )
    450         $url = str_replace('://', '://www.', $url);
    451 
    452     // Strip 'www.' if it is present and shouldn't be
    453     if ( false === strpos(home_url(), '://www.') )
    454         $url = str_replace('://www.', '://', $url);
    455 
    456     // Strip 'index.php/' if we're not using path info permalinks
    457     if ( !$wp_rewrite->using_index_permalinks() )
    458         $url = str_replace( $wp_rewrite->index . '/', '', $url );
    459 
    460     if ( false !== strpos( trailingslashit( $url ), home_url( '/' ) ) ) {
    461         // Chop off http://domain.com/[path]
    462         $url = str_replace(home_url(), '', $url);
    463     } else {
    464         // Chop off /path/to/blog
    465         $home_path = parse_url( home_url( '/' ) );
    466         $home_path = isset( $home_path['path'] ) ? $home_path['path'] : '' ;
    467         $url = preg_replace( sprintf( '#^%s#', preg_quote( $home_path ) ), '', trailingslashit( $url ) );
    468     }
    469 
    470     // Trim leading and lagging slashes
    471     $url = trim($url, '/');
    472 
    473     $request = $url;
    474     $post_type_query_vars = array();
    475 
    476     foreach ( get_post_types( array() , 'objects' ) as $post_type => $t ) {
    477         if ( ! empty( $t->query_var ) )
    478             $post_type_query_vars[ $t->query_var ] = $post_type;
    479     }
    480 
    481     // Look for matches.
    482     $request_match = $request;
    483     foreach ( (array)$rewrite as $match => $query) {
    484 
    485         // If the requesting file is the anchor of the match, prepend it
    486         // to the path info.
    487         if ( !empty($url) && ($url != $request) && (strpos($match, $url) === 0) )
    488             $request_match = $url . '/' . $request;
    489 
    490         if ( preg_match("#^$match#", $request_match, $matches) ) {
    491 
    492             if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {
    493                 // This is a verbose page match, let's check to be sure about it.
    494                 if ( ! get_page_by_path( $matches[ $varmatch[1] ] ) )
    495                     continue;
    496             }
    497 
    498             // Got a match.
    499             // Trim the query of everything up to the '?'.
    500             $query = preg_replace("!^.+\?!", '', $query);
    501 
    502             // Substitute the substring matches into the query.
    503             $query = addslashes(WP_MatchesMapRegex::apply($query, $matches));
    504 
    505             // Filter out non-public query vars
    506             global $wp;
    507             parse_str( $query, $query_vars );
    508             $query = array();
    509             foreach ( (array) $query_vars as $key => $value ) {
    510                 if ( in_array( $key, $wp->public_query_vars ) ){
    511                     $query[$key] = $value;
    512                     if ( isset( $post_type_query_vars[$key] ) ) {
    513                         $query['post_type'] = $post_type_query_vars[$key];
    514                         $query['name'] = $value;
    515                     }
    516                 }
    517             }
    518 
    519             // Resolve conflicts between posts with numeric slugs and date archive queries.
    520             $query = wp_resolve_numeric_slug_conflicts( $query );
    521 
    522             // Do the query
    523             $query = new WP_Query( $query );
    524             if ( ! empty( $query->posts ) && $query->is_singular )
    525                 return $query->post->ID;
    526             else
    527                 return 0;
    528         }
    529     }
    530     return 0;
    531 }
    532 
    533 /**
    534  * WordPress Rewrite Component.
    535  *
    536  * The WordPress Rewrite class writes the rewrite module rules to the .htaccess
    537  * file. It also handles parsing the request to get the correct setup for the
    538  * WordPress Query class.
    539  *
    540  * The Rewrite along with WP class function as a front controller for WordPress.
    541  * You can add rules to trigger your page view and processing using this
    542  * component. The full functionality of a front controller does not exist,
    543  * meaning you can't define how the template files load based on the rewrite
    544  * rules.
    545  *
    546  * @since 1.5.0
    547  */
    548 class WP_Rewrite {
    549     /**
    550      * Permalink structure for posts.
    551      *
    552      * @since 1.5.0
    553      * @var string
    554      */
    555     public $permalink_structure;
    556 
    557     /**
    558      * Whether to add trailing slashes.
    559      *
    560      * @since 2.2.0
    561      * @var bool
    562      */
    563     public $use_trailing_slashes;
    564 
    565     /**
    566      * Base for the author permalink structure (example.com/$author_base/authorname).
    567      *
    568      * @since 1.5.0
    569      * @access private
    570      * @var string
    571      */
    572     var $author_base = 'author';
    573 
    574     /**
    575      * Permalink structure for author archives.
    576      *
    577      * @since 1.5.0
    578      * @access private
    579      * @var string
    580      */
    581     var $author_structure;
    582 
    583     /**
    584      * Permalink structure for date archives.
    585      *
    586      * @since 1.5.0
    587      * @access private
    588      * @var string
    589      */
    590     var $date_structure;
    591 
    592     /**
    593      * Permalink structure for pages.
    594      *
    595      * @since 1.5.0
    596      * @access private
    597      * @var string
    598      */
    599     var $page_structure;
    600 
    601     /**
    602      * Base of the search permalink structure (example.com/$search_base/query).
    603      *
    604      * @since 1.5.0
    605      * @access private
    606      * @var string
    607      */
    608     var $search_base = 'search';
    609 
    610     /**
    611      * Permalink structure for searches.
    612      *
    613      * @since 1.5.0
    614      * @access private
    615      * @var string
    616      */
    617     var $search_structure;
    618 
    619     /**
    620      * Comments permalink base.
    621      *
    622      * @since 1.5.0
    623      * @access private
    624      * @var string
    625      */
    626     var $comments_base = 'comments';
    627 
    628     /**
    629      * Pagination permalink base.
    630      *
    631      * @since 3.1.0
    632      * @var string
    633      */
    634     public $pagination_base = 'page';
    635 
    636     /**
    637      * Comments pagination permalink base.
    638      *
    639      * @since 4.2.0
    640      * @access private
    641      * @var string
    642      */
    643     var $comments_pagination_base = 'comment-page';
    644 
    645     /**
    646      * Feed permalink base.
    647      *
    648      * @since 1.5.0
    649      * @access private
    650      * @var string
    651      */
    652     var $feed_base = 'feed';
    653 
    654     /**
    655      * Comments feed permalink structure.
    656      *
    657      * @since 1.5.0
    658      * @access private
    659      * @var string
    660      */
    661     var $comment_feed_structure;
    662 
    663     /**
    664      * Feed request permalink structure.
    665      *
    666      * @since 1.5.0
    667      * @access private
    668      * @var string
    669      */
    670     var $feed_structure;
    671 
    672     /**
    673      * The static portion of the post permalink structure.
    674      *
    675      * If the permalink structure is "/archive/%post_id%" then the front
    676      * is "/archive/". If the permalink structure is "/%year%/%postname%/"
    677      * then the front is "/".
    678      *
    679      * @see WP_Rewrite::init()
    680      * @since 1.5.0
    681      * @var string
    682      */
    683     public $front;
    684 
    685     /**
    686      * The prefix for all permalink structures.
    687      *
    688      * If PATHINFO/index permalinks are in use then the root is the value of
    689      * {@link WP_Rewrite::$index} with a trailing slash appended. Otherwise
    690      * the root will be empty.
    691      *
    692      * @see WP_Rewrite::init()
    693      * @see WP_Rewrite::using_index_permalinks()
    694      * @since 1.5.0
    695      * @var string
    696      */
    697     public $root = '';
    698 
    699     /**
    700      * The name of the index file which is the entry point to all requests.
    701      *
    702      * @since 1.5.0
    703      * @access public
    704      * @var string
    705      */
    706     public $index = 'index.php';
    707 
    708     /**
    709      * Variable name to use for regex matches in the rewritten query.
    710      *
    711      * @since 1.5.0
    712      * @access private
    713      * @var string
    714      */
    715     var $matches = '';
    716 
    717     /**
    718      * Rewrite rules to match against the request to find the redirect or query.
    719      *
    720      * @since 1.5.0
    721      * @access private
    722      * @var array
    723      */
    724     var $rules;
    725 
    726     /**
    727      * Additional rules added external to the rewrite class.
    728      *
    729      * Those not generated by the class, see add_rewrite_rule().
    730      *
    731      * @since 2.1.0
    732      * @access private
    733      * @var array
    734      */
    735     var $extra_rules = array();
    736 
    737     /**
    738      * Additional rules that belong at the beginning to match first.
    739      *
    740      * Those not generated by the class, see add_rewrite_rule().
    741      *
    742      * @since 2.3.0
    743      * @access private
    744      * @var array
    745      */
    746     var $extra_rules_top = array();
    747 
    748     /**
    749      * Rules that don't redirect to WordPress' index.php.
    750      *
    751      * These rules are written to the mod_rewrite portion of the .htaccess,
    752      * and are added by {@link add_external_rule()}.
    753      *
    754      * @since 2.1.0
    755      * @access private
    756      * @var array
    757      */
    758     var $non_wp_rules = array();
    759 
    760     /**
    761      * Extra permalink structures, e.g. categories, added by {@link add_permastruct()}.
    762      *
    763      * @since 2.1.0
    764      * @access private
    765      * @var array
    766      */
    767     var $extra_permastructs = array();
    768 
    769     /**
    770      * Endpoints (like /trackback/) added by {@link add_rewrite_endpoint()}.
    771      *
    772      * @since 2.1.0
    773      * @access private
    774      * @var array
    775      */
    776     var $endpoints;
    777 
    778     /**
    779      * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
    780      *
    781      * This is off by default, turning it on might print a lot of rewrite rules
    782      * to the .htaccess file.
    783      *
    784      * @see WP_Rewrite::mod_rewrite_rules()
    785      * @since 2.0.0
    786      * @access public
    787      * @var bool
    788      */
    789     public $use_verbose_rules = false;
    790 
    791     /**
    792      * Could post permalinks be confused with those of pages?
    793      *
    794      * If the first rewrite tag in the post permalink structure is one that could
    795      * also match a page name (e.g. %postname% or %author%) then this flag is
    796      * set to true. Prior to WordPress 3.3 this flag indicated that every page
    797      * would have a set of rules added to the top of the rewrite rules array.
    798      * Now it tells {@link WP::parse_request()} to check if a URL matching the
    799      * page permastruct is actually a page before accepting it.
    800      *
    801      * @link https://core.trac.wordpress.org/ticket/16687
    802      * @see WP_Rewrite::init()
    803      * @since 2.5.0
    804      * @access public
    805      * @var bool
    806      */
    807     public $use_verbose_page_rules = true;
    808 
    809     /**
    810      * Rewrite tags that can be used in permalink structures.
    811      *
    812      * These are translated into the regular expressions stored in
    813      * {@link WP_Rewrite::$rewritereplace} and are rewritten to the
    814      * query variables listed in {@link WP_Rewrite::$queryreplace}.
    815      *
    816      * Additional tags can be added with {@link add_rewrite_tag()}.
    817      *
    818      * @since 1.5.0
    819      * @access private
    820      * @var array
    821      */
    822     var $rewritecode = array(
    823         '%year%',
    824         '%monthnum%',
    825         '%day%',
    826         '%hour%',
    827         '%minute%',
    828         '%second%',
    829         '%postname%',
    830         '%post_id%',
    831         '%author%',
    832         '%pagename%',
    833         '%search%'
    834     );
    835 
    836     /**
    837      * Regular expressions to be substituted into rewrite rules in place
    838      * of rewrite tags, see {@link WP_Rewrite::$rewritecode}.
    839      *
    840      * @since 1.5.0
    841      * @access private
    842      * @var array
    843      */
    844     var $rewritereplace = array(
    845         '([0-9]{4})',
    846         '([0-9]{1,2})',
    847         '([0-9]{1,2})',
    848         '([0-9]{1,2})',
    849         '([0-9]{1,2})',
    850         '([0-9]{1,2})',
    851         '([^/]+)',
    852         '([0-9]+)',
    853         '([^/]+)',
    854         '([^/]+?)',
    855         '(.+)'
    856     );
    857 
    858     /**
    859      * Query variables that rewrite tags map to, see {@link WP_Rewrite::$rewritecode}.
    860      *
    861      * @since 1.5.0
    862      * @access private
    863      * @var array
    864      */
    865     var $queryreplace = array(
    866         'year=',
    867         'monthnum=',
    868         'day=',
    869         'hour=',
    870         'minute=',
    871         'second=',
    872         'name=',
    873         'p=',
    874         'author_name=',
    875         'pagename=',
    876         's='
    877     );
    878 
    879     /**
    880      * Supported default feeds.
    881      *
    882      * @since 1.5.0
    883      * @var array
    884      */
    885     public $feeds = array( 'feed', 'rdf', 'rss', 'rss2', 'atom' );
    886 
    887     /**
    888      * Whether permalinks are being used.
    889      *
    890      * This can be either rewrite module or permalink in the HTTP query string.
    891      *
    892      * @since 1.5.0
    893      * @access public
    894      *
    895      * @return bool True, if permalinks are enabled.
    896      */
    897     public function using_permalinks() {
    898         return ! empty($this->permalink_structure);
    899     }
    900 
    901     /**
    902      * Whether permalinks are being used and rewrite module is not enabled.
    903      *
    904      * Means that permalink links are enabled and index.php is in the URL.
    905      *
    906      * @since 1.5.0
    907      * @access public
    908      *
    909      * @return bool
    910      */
    911     public function using_index_permalinks() {
    912         if ( empty( $this->permalink_structure ) ) {
    913             return false;
    914         }
    915         // If the index is not in the permalink, we're using mod_rewrite.
    916         return preg_match( '#^/*' . $this->index . '#', $this->permalink_structure );
    917     }
    918 
    919     /**
    920      * Whether permalinks are being used and rewrite module is enabled.
    921      *
    922      * Using permalinks and index.php is not in the URL.
    923      *
    924      * @since 1.5.0
    925      * @access public
    926      *
    927      * @return bool
    928      */
    929     public function using_mod_rewrite_permalinks() {
    930         return $this->using_permalinks() && ! $this->using_index_permalinks();
    931     }
    932 
    933     /**
    934      * Index for matches for usage in preg_*() functions.
    935      *
    936      * The format of the string is, with empty matches property value, '$NUM'.
    937      * The 'NUM' will be replaced with the value in the $number parameter. With
    938      * the matches property not empty, the value of the returned string will
    939      * contain that value of the matches property. The format then will be
    940      * '$MATCHES[NUM]', with MATCHES as the value in the property and NUM the
    941      * value of the $number parameter.
    942      *
    943      * @since 1.5.0
    944      * @access public
    945      *
    946      * @param int $number Index number.
    947      * @return string
    948      */
    949     public function preg_index($number) {
    950         $match_prefix = '$';
    951         $match_suffix = '';
    952 
    953         if ( ! empty($this->matches) ) {
    954             $match_prefix = '$' . $this->matches . '[';
    955             $match_suffix = ']';
    956         }
    957 
    958         return "$match_prefix$number$match_suffix";
    959     }
    960 
    961     /**
    962      * Retrieve all page and attachments for pages URIs.
    963      *
    964      * The attachments are for those that have pages as parents and will be
    965      * retrieved.
    966      *
    967      * @since 2.5.0
    968      * @access public
    969      *
    970      * @global wpdb $wpdb
    971      *
    972      * @return array Array of page URIs as first element and attachment URIs as second element.
    973      */
    974     public function page_uri_index() {
    975         global $wpdb;
    976 
    977         //get pages in order of hierarchy, i.e. children after parents
    978         $pages = $wpdb->get_results("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page' AND post_status != 'auto-draft'");
    979         $posts = get_page_hierarchy( $pages );
    980 
    981         // If we have no pages get out quick
    982         if ( !$posts )
    983             return array( array(), array() );
    984 
    985         //now reverse it, because we need parents after children for rewrite rules to work properly
    986         $posts = array_reverse($posts, true);
    987 
    988         $page_uris = array();
    989         $page_attachment_uris = array();
    990 
    991         foreach ( $posts as $id => $post ) {
    992             // URL => page name
    993             $uri = get_page_uri($id);
    994             $attachments = $wpdb->get_results( $wpdb->prepare( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = %d", $id ));
    995             if ( !empty($attachments) ) {
    996                 foreach ( $attachments as $attachment ) {
    997                     $attach_uri = get_page_uri($attachment->ID);
    998                     $page_attachment_uris[$attach_uri] = $attachment->ID;
    999                 }
    1000             }
    1001 
    1002             $page_uris[$uri] = $id;
    1003         }
    1004 
    1005         return array( $page_uris, $page_attachment_uris );
    1006     }
    1007 
    1008     /**
    1009      * Retrieve all of the rewrite rules for pages.
    1010      *
    1011      * @since 1.5.0
    1012      * @access public
    1013      *
    1014      * @return array
    1015      */
    1016     public function page_rewrite_rules() {
    1017         // the extra .? at the beginning prevents clashes with other regular expressions in the rules array
    1018         $this->add_rewrite_tag( '%pagename%', '(.?.+?)', 'pagename=' );
    1019 
    1020         return $this->generate_rewrite_rules( $this->get_page_permastruct(), EP_PAGES, true, true, false, false );
    1021     }
    1022 
    1023     /**
    1024      * Retrieve date permalink structure, with year, month, and day.
    1025      *
    1026      * The permalink structure for the date, if not set already depends on the
    1027      * permalink structure. It can be one of three formats. The first is year,
    1028      * month, day; the second is day, month, year; and the last format is month,
    1029      * day, year. These are matched against the permalink structure for which
    1030      * one is used. If none matches, then the default will be used, which is
    1031      * year, month, day.
    1032      *
    1033      * Prevents post ID and date permalinks from overlapping. In the case of
    1034      * post_id, the date permalink will be prepended with front permalink with
    1035      * 'date/' before the actual permalink to form the complete date permalink
    1036      * structure.
    1037      *
    1038      * @since 1.5.0
    1039      * @access public
    1040      *
    1041      * @return string|false False on no permalink structure. Date permalink structure.
    1042      */
    1043     public function get_date_permastruct() {
    1044         if ( isset($this->date_structure) )
    1045             return $this->date_structure;
    1046 
    1047         if ( empty($this->permalink_structure) ) {
    1048             $this->date_structure = '';
    1049             return false;
    1050         }
    1051 
    1052         // The date permalink must have year, month, and day separated by slashes.
    1053         $endians = array('%year%/%monthnum%/%day%', '%day%/%monthnum%/%year%', '%monthnum%/%day%/%year%');
    1054 
    1055         $this->date_structure = '';
    1056         $date_endian = '';
    1057 
    1058         foreach ( $endians as $endian ) {
    1059             if ( false !== strpos($this->permalink_structure, $endian) ) {
    1060                 $date_endian= $endian;
    1061                 break;
    1062             }
    1063         }
    1064 
    1065         if ( empty($date_endian) )
    1066             $date_endian = '%year%/%monthnum%/%day%';
    1067 
    1068         // Do not allow the date tags and %post_id% to overlap in the permalink
    1069         // structure. If they do, move the date tags to $front/date/.
    1070         $front = $this->front;
    1071         preg_match_all('/%.+?%/', $this->permalink_structure, $tokens);
    1072         $tok_index = 1;
    1073         foreach ( (array) $tokens[0] as $token) {
    1074             if ( '%post_id%' == $token && ($tok_index <= 3) ) {
    1075                 $front = $front . 'date/';
    1076                 break;
    1077             }
    1078             $tok_index++;
    1079         }
    1080 
    1081         $this->date_structure = $front . $date_endian;
    1082 
    1083         return $this->date_structure;
    1084     }
    1085 
    1086     /**
    1087      * Retrieve the year permalink structure without month and day.
    1088      *
    1089      * Gets the date permalink structure and strips out the month and day
    1090      * permalink structures.
    1091      *
    1092      * @since 1.5.0
    1093      * @access public
    1094      *
    1095      * @return false|string False on failure. Year structure on success.
    1096      */
    1097     public function get_year_permastruct() {
    1098         $structure = $this->get_date_permastruct();
    1099 
    1100         if ( empty($structure) )
    1101             return false;
    1102 
    1103         $structure = str_replace('%monthnum%', '', $structure);
    1104         $structure = str_replace('%day%', '', $structure);
    1105         $structure = preg_replace('#/+#', '/', $structure);
    1106 
    1107         return $structure;
    1108     }
    1109 
    1110     /**
    1111      * Retrieve the month permalink structure without day and with year.
    1112      *
    1113      * Gets the date permalink structure and strips out the day permalink
    1114      * structures. Keeps the year permalink structure.
    1115      *
    1116      * @since 1.5.0
    1117      * @access public
    1118      *
    1119      * @return false|string False on failure. Year/Month structure on success.
    1120      */
    1121     public function get_month_permastruct() {
    1122         $structure = $this->get_date_permastruct();
    1123 
    1124         if ( empty($structure) )
    1125             return false;
    1126 
    1127         $structure = str_replace('%day%', '', $structure);
    1128         $structure = preg_replace('#/+#', '/', $structure);
    1129 
    1130         return $structure;
    1131     }
    1132 
    1133     /**
    1134      * Retrieve the day permalink structure with month and year.
    1135      *
    1136      * Keeps date permalink structure with all year, month, and day.
    1137      *
    1138      * @since 1.5.0
    1139      * @access public
    1140      *
    1141      * @return string|false False on failure. Year/Month/Day structure on success.
    1142      */
    1143     public function get_day_permastruct() {
    1144         return $this->get_date_permastruct();
    1145     }
    1146 
    1147     /**
    1148      * Retrieve the permalink structure for categories.
    1149      *
    1150      * If the category_base property has no value, then the category structure
    1151      * will have the front property value, followed by 'category', and finally
    1152      * '%category%'. If it does, then the root property will be used, along with
    1153      * the category_base property value.
    1154      *
    1155      * @since 1.5.0
    1156      * @access public
    1157      *
    1158      * @return string|false False on failure. Category permalink structure.
    1159      */
    1160     public function get_category_permastruct() {
    1161         return $this->get_extra_permastruct('category');
    1162     }
    1163 
    1164     /**
    1165      * Retrieve the permalink structure for tags.
    1166      *
    1167      * If the tag_base property has no value, then the tag structure will have
    1168      * the front property value, followed by 'tag', and finally '%tag%'. If it
    1169      * does, then the root property will be used, along with the tag_base
    1170      * property value.
    1171      *
    1172      * @since 2.3.0
    1173      * @access public
    1174      *
    1175      * @return string|false False on failure. Tag permalink structure.
    1176      */
    1177     public function get_tag_permastruct() {
    1178         return $this->get_extra_permastruct('post_tag');
    1179     }
    1180 
    1181     /**
    1182      * Retrieve extra permalink structure by name.
    1183      *
    1184      * @since 2.5.0
    1185      * @access public
    1186      *
    1187      * @param string $name Permalink structure name.
    1188      * @return string|false False if not found. Permalink structure string.
    1189      */
    1190     public function get_extra_permastruct($name) {
    1191         if ( empty($this->permalink_structure) )
    1192             return false;
    1193 
    1194         if ( isset($this->extra_permastructs[$name]) )
    1195             return $this->extra_permastructs[$name]['struct'];
    1196 
    1197         return false;
    1198     }
    1199 
    1200     /**
    1201      * Retrieve the author permalink structure.
    1202      *
    1203      * The permalink structure is front property, author base, and finally
    1204      * '/%author%'. Will set the author_structure property and then return it
    1205      * without attempting to set the value again.
    1206      *
    1207      * @since 1.5.0
    1208      * @access public
    1209      *
    1210      * @return string|false False if not found. Permalink structure string.
    1211      */
    1212     public function get_author_permastruct() {
    1213         if ( isset($this->author_structure) )
    1214             return $this->author_structure;
    1215 
    1216         if ( empty($this->permalink_structure) ) {
    1217             $this->author_structure = '';
    1218             return false;
    1219         }
    1220 
    1221         $this->author_structure = $this->front . $this->author_base . '/%author%';
    1222 
    1223         return $this->author_structure;
    1224     }
    1225 
    1226     /**
    1227      * Retrieve the search permalink structure.
    1228      *
    1229      * The permalink structure is root property, search base, and finally
    1230      * '/%search%'. Will set the search_structure property and then return it
    1231      * without attempting to set the value again.
    1232      *
    1233      * @since 1.5.0
    1234      * @access public
    1235      *
    1236      * @return string|false False if not found. Permalink structure string.
    1237      */
    1238     public function get_search_permastruct() {
    1239         if ( isset($this->search_structure) )
    1240             return $this->search_structure;
    1241 
    1242         if ( empty($this->permalink_structure) ) {
    1243             $this->search_structure = '';
    1244             return false;
    1245         }
    1246 
    1247         $this->search_structure = $this->root . $this->search_base . '/%search%';
    1248 
    1249         return $this->search_structure;
    1250     }
    1251 
    1252     /**
    1253      * Retrieve the page permalink structure.
    1254      *
    1255      * The permalink structure is root property, and '%pagename%'. Will set the
    1256      * page_structure property and then return it without attempting to set the
    1257      * value again.
    1258      *
    1259      * @since 1.5.0
    1260      * @access public
    1261      *
    1262      * @return string|false False if not found. Permalink structure string.
    1263      */
    1264     public function get_page_permastruct() {
    1265         if ( isset($this->page_structure) )
    1266             return $this->page_structure;
    1267 
    1268         if (empty($this->permalink_structure)) {
    1269             $this->page_structure = '';
    1270             return false;
    1271         }
    1272 
    1273         $this->page_structure = $this->root . '%pagename%';
    1274 
    1275         return $this->page_structure;
    1276     }
    1277 
    1278     /**
    1279      * Retrieve the feed permalink structure.
    1280      *
    1281      * The permalink structure is root property, feed base, and finally
    1282      * '/%feed%'. Will set the feed_structure property and then return it
    1283      * without attempting to set the value again.
    1284      *
    1285      * @since 1.5.0
    1286      * @access public
    1287      *
    1288      * @return string|false False if not found. Permalink structure string.
    1289      */
    1290     public function get_feed_permastruct() {
    1291         if ( isset($this->feed_structure) )
    1292             return $this->feed_structure;
    1293 
    1294         if ( empty($this->permalink_structure) ) {
    1295             $this->feed_structure = '';
    1296             return false;
    1297         }
    1298 
    1299         $this->feed_structure = $this->root . $this->feed_base . '/%feed%';
    1300 
    1301         return $this->feed_structure;
    1302     }
    1303 
    1304     /**
    1305      * Retrieve the comment feed permalink structure.
    1306      *
    1307      * The permalink structure is root property, comment base property, feed
    1308      * base and finally '/%feed%'. Will set the comment_feed_structure property
    1309      * and then return it without attempting to set the value again.
    1310      *
    1311      * @since 1.5.0
    1312      * @access public
    1313      *
    1314      * @return string|false False if not found. Permalink structure string.
    1315      */
    1316     public function get_comment_feed_permastruct() {
    1317         if ( isset($this->comment_feed_structure) )
    1318             return $this->comment_feed_structure;
    1319 
    1320         if (empty($this->permalink_structure)) {
    1321             $this->comment_feed_structure = '';
    1322             return false;
    1323         }
    1324 
    1325         $this->comment_feed_structure = $this->root . $this->comments_base . '/' . $this->feed_base . '/%feed%';
    1326 
    1327         return $this->comment_feed_structure;
    1328     }
    1329 
    1330     /**
    1331      * Add or update existing rewrite tags (e.g. %postname%).
    1332      *
    1333      * If the tag already exists, replace the existing pattern and query for
    1334      * that tag, otherwise add the new tag.
    1335      *
    1336      * @see WP_Rewrite::$rewritecode
    1337      * @see WP_Rewrite::$rewritereplace
    1338      * @see WP_Rewrite::$queryreplace
    1339      * @since 1.5.0
    1340      * @access public
    1341      *
    1342      * @param string $tag   Name of the rewrite tag to add or update.
    1343      * @param string $regex Regular expression to substitute the tag for in rewrite rules.
    1344      * @param string $query String to append to the rewritten query. Must end in '='.
    1345      */
    1346     public function add_rewrite_tag( $tag, $regex, $query ) {
    1347         $position = array_search( $tag, $this->rewritecode );
    1348         if ( false !== $position && null !== $position ) {
    1349             $this->rewritereplace[ $position ] = $regex;
    1350             $this->queryreplace[ $position ] = $query;
    1351         } else {
    1352             $this->rewritecode[] = $tag;
    1353             $this->rewritereplace[] = $regex;
    1354             $this->queryreplace[] = $query;
    1355         }
    1356     }
    1357 
    1358     /**
    1359      * Generate rewrite rules from a permalink structure.
    1360      *
    1361      * The main WP_Rewrite function for building the rewrite rule list. The
    1362      * contents of the function is a mix of black magic and regular expressions,
    1363      * so best just ignore the contents and move to the parameters.
    1364      *
    1365      * @since 1.5.0
    1366      * @access public
    1367      *
    1368      * @param string $permalink_structure The permalink structure.
    1369      * @param int    $ep_mask             Endpoint mask defining what endpoints are added to the structure. Default is EP_NONE.
    1370      * @param bool   $paged               Should archive pagination rules be added for the structure? Default is true.
    1371      * @param bool   $feed                Should feed rewrite rules be added for the structure? Default is true.
    1372      * @param bool   $forcomments         Should the feed rules be a query for a comments feed? Default is false.
    1373      * @param bool   $walk_dirs           Should the 'directories' making up the structure be walked over and rewrite rules
    1374      *                                    built for each in turn? Default is true.
    1375      * @param bool   $endpoints           Should endpoints be applied to the generated rewrite rules? Default is true.
    1376      * @return array Rewrite rule list.
    1377      */
    1378     public function generate_rewrite_rules($permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true) {
    1379         //build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
    1380         $feedregex2 = '';
    1381         foreach ( (array) $this->feeds as $feed_name)
    1382             $feedregex2 .= $feed_name . '|';
    1383         $feedregex2 = '(' . trim($feedregex2, '|') . ')/?$';
    1384 
    1385         //$feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom
    1386         //and <permalink>/atom are both possible
    1387         $feedregex = $this->feed_base . '/' . $feedregex2;
    1388 
    1389         //build a regex to match the trackback and page/xx parts of URLs
    1390         $trackbackregex = 'trackback/?$';
    1391         $pageregex = $this->pagination_base . '/?([0-9]{1,})/?$';
    1392         $commentregex = $this->comments_pagination_base . '-([0-9]{1,})/?$';
    1393 
    1394         //build up an array of endpoint regexes to append => queries to append
    1395         if ( $endpoints ) {
    1396             $ep_query_append = array ();
    1397             foreach ( (array) $this->endpoints as $endpoint) {
    1398                 //match everything after the endpoint name, but allow for nothing to appear there
    1399                 $epmatch = $endpoint[1] . '(/(.*))?/?$';
    1400                 //this will be appended on to the rest of the query for each dir
    1401                 $epquery = '&' . $endpoint[2] . '=';
    1402                 $ep_query_append[$epmatch] = array ( $endpoint[0], $epquery );
    1403             }
    1404         }
    1405 
    1406         //get everything up to the first rewrite tag
    1407         $front = substr($permalink_structure, 0, strpos($permalink_structure, '%'));
    1408         //build an array of the tags (note that said array ends up being in $tokens[0])
    1409         preg_match_all('/%.+?%/', $permalink_structure, $tokens);
    1410 
    1411         $num_tokens = count($tokens[0]);
    1412 
    1413         $index = $this->index; //probably 'index.php'
    1414         $feedindex = $index;
    1415         $trackbackindex = $index;
    1416         //build a list from the rewritecode and queryreplace arrays, that will look something like
    1417         //tagname=$matches[i] where i is the current $i
    1418         $queries = array();
    1419         for ( $i = 0; $i < $num_tokens; ++$i ) {
    1420             if ( 0 < $i )
    1421                 $queries[$i] = $queries[$i - 1] . '&';
    1422             else
    1423                 $queries[$i] = '';
    1424 
    1425             $query_token = str_replace($this->rewritecode, $this->queryreplace, $tokens[0][$i]) . $this->preg_index($i+1);
    1426             $queries[$i] .= $query_token;
    1427         }
    1428 
    1429         //get the structure, minus any cruft (stuff that isn't tags) at the front
    1430         $structure = $permalink_structure;
    1431         if ( $front != '/' )
    1432             $structure = str_replace($front, '', $structure);
    1433 
    1434         //create a list of dirs to walk over, making rewrite rules for each level
    1435         //so for example, a $structure of /%year%/%monthnum%/%postname% would create
    1436         //rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
    1437         $structure = trim($structure, '/');
    1438         $dirs = $walk_dirs ? explode('/', $structure) : array( $structure );
    1439         $num_dirs = count($dirs);
    1440 
    1441         //strip slashes from the front of $front
    1442         $front = preg_replace('|^/+|', '', $front);
    1443 
    1444         //the main workhorse loop
    1445         $post_rewrite = array();
    1446         $struct = $front;
    1447         for ( $j = 0; $j < $num_dirs; ++$j ) {
    1448             //get the struct for this dir, and trim slashes off the front
    1449             $struct .= $dirs[$j] . '/'; //accumulate. see comment near explode('/', $structure) above
    1450             $struct = ltrim($struct, '/');
    1451 
    1452             //replace tags with regexes
    1453             $match = str_replace($this->rewritecode, $this->rewritereplace, $struct);
    1454 
    1455             //make a list of tags, and store how many there are in $num_toks
    1456             $num_toks = preg_match_all('/%.+?%/', $struct, $toks);
    1457 
    1458             //get the 'tagname=$matches[i]'
    1459             $query = ( ! empty( $num_toks ) && isset( $queries[$num_toks - 1] ) ) ? $queries[$num_toks - 1] : '';
    1460 
    1461             //set up $ep_mask_specific which is used to match more specific URL types
    1462             switch ( $dirs[$j] ) {
    1463                 case '%year%':
    1464                     $ep_mask_specific = EP_YEAR;
    1465                     break;
    1466                 case '%monthnum%':
    1467                     $ep_mask_specific = EP_MONTH;
    1468                     break;
    1469                 case '%day%':
    1470                     $ep_mask_specific = EP_DAY;
    1471                     break;
    1472                 default:
    1473                     $ep_mask_specific = EP_NONE;
    1474             }
    1475 
    1476             //create query for /page/xx
    1477             $pagematch = $match . $pageregex;
    1478             $pagequery = $index . '?' . $query . '&paged=' . $this->preg_index($num_toks + 1);
    1479 
    1480             //create query for /comment-page-xx
    1481             $commentmatch = $match . $commentregex;
    1482             $commentquery = $index . '?' . $query . '&cpage=' . $this->preg_index($num_toks + 1);
    1483 
    1484             if ( get_option('page_on_front') ) {
    1485                 //create query for Root /comment-page-xx
    1486                 $rootcommentmatch = $match . $commentregex;
    1487                 $rootcommentquery = $index . '?' . $query . '&page_id=' . get_option('page_on_front') . '&cpage=' . $this->preg_index($num_toks + 1);
    1488             }
    1489 
    1490             //create query for /feed/(feed|atom|rss|rss2|rdf)
    1491             $feedmatch = $match . $feedregex;
    1492             $feedquery = $feedindex . '?' . $query . '&feed=' . $this->preg_index($num_toks + 1);
    1493 
    1494             //create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex)
    1495             $feedmatch2 = $match . $feedregex2;
    1496             $feedquery2 = $feedindex . '?' . $query . '&feed=' . $this->preg_index($num_toks + 1);
    1497 
    1498             //if asked to, turn the feed queries into comment feed ones
    1499             if ( $forcomments ) {
    1500                 $feedquery .= '&withcomments=1';
    1501                 $feedquery2 .= '&withcomments=1';
    1502             }
    1503 
    1504             //start creating the array of rewrites for this dir
    1505             $rewrite = array();
    1506             if ( $feed ) //...adding on /feed/ regexes => queries
    1507                 $rewrite = array($feedmatch => $feedquery, $feedmatch2 => $feedquery2);
    1508             if ( $paged ) //...and /page/xx ones
    1509                 $rewrite = array_merge($rewrite, array($pagematch => $pagequery));
    1510 
    1511             //only on pages with comments add ../comment-page-xx/
    1512             if ( EP_PAGES & $ep_mask || EP_PERMALINK & $ep_mask ) {
    1513                 $rewrite = array_merge($rewrite, array($commentmatch => $commentquery));
    1514             } elseif ( EP_ROOT & $ep_mask && get_option('page_on_front') ) {
    1515                 $rewrite = array_merge($rewrite, array($rootcommentmatch => $rootcommentquery));
    1516             }
    1517             //do endpoints
    1518             if ( $endpoints ) {
    1519                 foreach ( (array) $ep_query_append as $regex => $ep) {
    1520                     //add the endpoints on if the mask fits
    1521                     if ( $ep[0] & $ep_mask || $ep[0] & $ep_mask_specific )
    1522                         $rewrite[$match . $regex] = $index . '?' . $query . $ep[1] . $this->preg_index($num_toks + 2);
    1523                 }
    1524             }
    1525 
    1526             //if we've got some tags in this dir
    1527             if ( $num_toks ) {
    1528                 $post = false;
    1529                 $page = false;
    1530 
    1531                 //check to see if this dir is permalink-level: i.e. the structure specifies an
    1532                 //individual post. Do this by checking it contains at least one of 1) post name,
    1533                 //2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
    1534                 //minute all present). Set these flags now as we need them for the endpoints.
    1535                 if ( strpos($struct, '%postname%') !== false
    1536                         || strpos($struct, '%post_id%') !== false
    1537                         || strpos($struct, '%pagename%') !== false
    1538                         || (strpos($struct, '%year%') !== false && strpos($struct, '%monthnum%') !== false && strpos($struct, '%day%') !== false && strpos($struct, '%hour%') !== false && strpos($struct, '%minute%') !== false && strpos($struct, '%second%') !== false)
    1539                         ) {
    1540                     $post = true;
    1541                     if ( strpos($struct, '%pagename%') !== false )
    1542                         $page = true;
    1543                 }
    1544 
    1545                 if ( ! $post ) {
    1546                     // For custom post types, we need to add on endpoints as well.
    1547                     foreach ( get_post_types( array('_builtin' => false ) ) as $ptype ) {
    1548                         if ( strpos($struct, "%$ptype%") !== false ) {
    1549                             $post = true;
    1550                             $page = is_post_type_hierarchical( $ptype ); // This is for page style attachment url's
    1551                             break;
    1552                         }
    1553                     }
    1554                 }
    1555 
    1556                 //if we're creating rules for a permalink, do all the endpoints like attachments etc
    1557                 if ( $post ) {
    1558                     //create query and regex for trackback
    1559                     $trackbackmatch = $match . $trackbackregex;
    1560                     $trackbackquery = $trackbackindex . '?' . $query . '&tb=1';
    1561                     //trim slashes from the end of the regex for this dir
    1562                     $match = rtrim($match, '/');
    1563                     //get rid of brackets
    1564                     $submatchbase = str_replace( array('(', ')'), '', $match);
    1565 
    1566                     //add a rule for at attachments, which take the form of <permalink>/some-text
    1567                     $sub1 = $submatchbase . '/([^/]+)/';
    1568                     $sub1tb = $sub1 . $trackbackregex; //add trackback regex <permalink>/trackback/...
    1569                     $sub1feed = $sub1 . $feedregex; //and <permalink>/feed/(atom|...)
    1570                     $sub1feed2 = $sub1 . $feedregex2; //and <permalink>/(feed|atom...)
    1571                     $sub1comment = $sub1 . $commentregex; //and <permalink>/comment-page-xx
    1572 
    1573                     //add another rule to match attachments in the explicit form:
    1574                     //<permalink>/attachment/some-text
    1575                     $sub2 = $submatchbase . '/attachment/([^/]+)/';
    1576                     $sub2tb = $sub2 . $trackbackregex; //and add trackbacks <permalink>/attachment/trackback
    1577                     $sub2feed = $sub2 . $feedregex;    //feeds, <permalink>/attachment/feed/(atom|...)
    1578                     $sub2feed2 = $sub2 . $feedregex2;  //and feeds again on to this <permalink>/attachment/(feed|atom...)
    1579                     $sub2comment = $sub2 . $commentregex; //and <permalink>/comment-page-xx
    1580 
    1581                     //create queries for these extra tag-ons we've just dealt with
    1582                     $subquery = $index . '?attachment=' . $this->preg_index(1);
    1583                     $subtbquery = $subquery . '&tb=1';
    1584                     $subfeedquery = $subquery . '&feed=' . $this->preg_index(2);
    1585                     $subcommentquery = $subquery . '&cpage=' . $this->preg_index(2);
    1586 
    1587                     //do endpoints for attachments
    1588                     if ( !empty($endpoints) ) {
    1589                         foreach ( (array) $ep_query_append as $regex => $ep ) {
    1590                             if ( $ep[0] & EP_ATTACHMENT ) {
    1591                                 $rewrite[$sub1 . $regex] = $subquery . $ep[1] . $this->preg_index(3);
    1592                                 $rewrite[$sub2 . $regex] = $subquery . $ep[1] . $this->preg_index(3);
    1593                             }
    1594                         }
    1595                     }
    1596 
    1597                     //now we've finished with endpoints, finish off the $sub1 and $sub2 matches
    1598                     //add a ? as we don't have to match that last slash, and finally a $ so we
    1599                     //match to the end of the URL
    1600                     $sub1 .= '?$';
    1601                     $sub2 .= '?$';
    1602 
    1603                     //post pagination, e.g. <permalink>/2/
    1604                     $match = $match . '(/[0-9]+)?/?$';
    1605                     $query = $index . '?' . $query . '&page=' . $this->preg_index($num_toks + 1);
    1606                 } else { //not matching a permalink so this is a lot simpler
    1607                     //close the match and finalise the query
    1608                     $match .= '?$';
    1609                     $query = $index . '?' . $query;
    1610                 }
    1611 
    1612                 //create the final array for this dir by joining the $rewrite array (which currently
    1613                 //only contains rules/queries for trackback, pages etc) to the main regex/query for
    1614                 //this dir
    1615                 $rewrite = array_merge($rewrite, array($match => $query));
    1616 
    1617                 //if we're matching a permalink, add those extras (attachments etc) on
    1618                 if ( $post ) {
    1619                     //add trackback
    1620                     $rewrite = array_merge(array($trackbackmatch => $trackbackquery), $rewrite);
    1621 
    1622                     //add regexes/queries for attachments, attachment trackbacks and so on
    1623                     if ( ! $page ) //require <permalink>/attachment/stuff form for pages because of confusion with subpages
    1624                         $rewrite = array_merge($rewrite, array($sub1 => $subquery, $sub1tb => $subtbquery, $sub1feed => $subfeedquery, $sub1feed2 => $subfeedquery, $sub1comment => $subcommentquery));
    1625                     $rewrite = array_merge(array($sub2 => $subquery, $sub2tb => $subtbquery, $sub2feed => $subfeedquery, $sub2feed2 => $subfeedquery, $sub2comment => $subcommentquery), $rewrite);
    1626                 }
    1627             } //if($num_toks)
    1628             //add the rules for this dir to the accumulating $post_rewrite
    1629             $post_rewrite = array_merge($rewrite, $post_rewrite);
    1630         } //foreach ($dir)
    1631         return $post_rewrite; //the finished rules. phew!
    1632     }
    1633 
    1634     /**
    1635      * Generate Rewrite rules with permalink structure and walking directory only.
    1636      *
    1637      * Shorten version of {@link WP_Rewrite::generate_rewrite_rules()} that
    1638      * allows for shorter list of parameters. See the method for longer
    1639      * description of what generating rewrite rules does.
    1640      *
    1641      * @uses WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
    1642      * @since 1.5.0
    1643      * @access public
    1644      *
    1645      * @param string $permalink_structure The permalink structure to generate rules.
    1646      * @param bool   $walk_dirs           Optional, default is false. Whether to create list of directories to walk over.
    1647      * @return array
    1648      */
    1649     public function generate_rewrite_rule($permalink_structure, $walk_dirs = false) {
    1650         return $this->generate_rewrite_rules($permalink_structure, EP_NONE, false, false, false, $walk_dirs);
    1651     }
    1652 
    1653     /**
    1654      * Construct rewrite matches and queries from permalink structure.
    1655      *
    1656      * Runs the action 'generate_rewrite_rules' with the parameter that is an
    1657      * reference to the current WP_Rewrite instance to further manipulate the
    1658      * permalink structures and rewrite rules. Runs the 'rewrite_rules_array'
    1659      * filter on the full rewrite rule array.
    1660      *
    1661      * There are two ways to manipulate the rewrite rules, one by hooking into
    1662      * the 'generate_rewrite_rules' action and gaining full control of the
    1663      * object or just manipulating the rewrite rule array before it is passed
    1664      * from the function.
    1665      *
    1666      * @since 1.5.0
    1667      * @access public
    1668      *
    1669      * @return array An associate array of matches and queries.
    1670      */
    1671     public function rewrite_rules() {
    1672         $rewrite = array();
    1673 
    1674         if ( empty($this->permalink_structure) )
    1675             return $rewrite;
    1676 
    1677         // robots.txt -only if installed at the root
    1678         $home_path = parse_url( home_url() );
    1679         $robots_rewrite = ( empty( $home_path['path'] ) || '/' == $home_path['path'] ) ? array( 'robots\.txt$' => $this->index . '?robots=1' ) : array();
    1680 
    1681         // Old feed and service files
    1682         $deprecated_files = array(
    1683             '.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
    1684             '.*wp-app\.php(/.*)?$' => $this->index . '?error=403',
    1685         );
    1686 
    1687         // Registration rules
    1688         $registration_pages = array();
    1689         if ( is_multisite() && is_main_site() ) {
    1690             $registration_pages['.*wp-signup.php$'] = $this->index . '?signup=true';
    1691             $registration_pages['.*wp-activate.php$'] = $this->index . '?activate=true';
    1692         }
    1693         $registration_pages['.*wp-register.php$'] = $this->index . '?register=true'; // Deprecated
    1694 
    1695         // Post rewrite rules.
    1696         $post_rewrite = $this->generate_rewrite_rules( $this->permalink_structure, EP_PERMALINK );
    1697 
    1698         /**
    1699          * Filter rewrite rules used for "post" archives.
    1700          *
    1701          * @since 1.5.0
    1702          *
    1703          * @param array $post_rewrite The rewrite rules for posts.
    1704          */
    1705         $post_rewrite = apply_filters( 'post_rewrite_rules', $post_rewrite );
    1706 
    1707         // Date rewrite rules.
    1708         $date_rewrite = $this->generate_rewrite_rules($this->get_date_permastruct(), EP_DATE);
    1709 
    1710         /**
    1711          * Filter rewrite rules used for date archives.
    1712          *
    1713          * Likely date archives would include /yyyy/, /yyyy/mm/, and /yyyy/mm/dd/.
    1714          *
    1715          * @since 1.5.0
    1716          *
    1717          * @param array $date_rewrite The rewrite rules for date archives.
    1718          */
    1719         $date_rewrite = apply_filters( 'date_rewrite_rules', $date_rewrite );
    1720 
    1721         // Root-level rewrite rules.
    1722         $root_rewrite = $this->generate_rewrite_rules($this->root . '/', EP_ROOT);
    1723 
    1724         /**
    1725          * Filter rewrite rules used for root-level archives.
    1726          *
    1727          * Likely root-level archives would include pagination rules for the homepage
    1728          * as well as site-wide post feeds (e.g. /feed/, and /feed/atom/).
    1729          *
    1730          * @since 1.5.0
    1731          *
    1732          * @param array $root_rewrite The root-level rewrite rules.
    1733          */
    1734         $root_rewrite = apply_filters( 'root_rewrite_rules', $root_rewrite );
    1735 
    1736         // Comments rewrite rules.
    1737         $comments_rewrite = $this->generate_rewrite_rules($this->root . $this->comments_base, EP_COMMENTS, false, true, true, false);
    1738 
    1739         /**
    1740          * Filter rewrite rules used for comment feed archives.
    1741          *
    1742          * Likely comments feed archives include /comments/feed/, and /comments/feed/atom/.
    1743          *
    1744          * @since 1.5.0
    1745          *
    1746          * @param array $comments_rewrite The rewrite rules for the site-wide comments feeds.
    1747          */
    1748         $comments_rewrite = apply_filters( 'comments_rewrite_rules', $comments_rewrite );
    1749 
    1750         // Search rewrite rules.
    1751         $search_structure = $this->get_search_permastruct();
    1752         $search_rewrite = $this->generate_rewrite_rules($search_structure, EP_SEARCH);
    1753 
    1754         /**
    1755          * Filter rewrite rules used for search archives.
    1756          *
    1757          * Likely search-related archives include /search/search+query/ as well as
    1758          * pagination and feed paths for a search.
    1759          *
    1760          * @since 1.5.0
    1761          *
    1762          * @param array $search_rewrite The rewrite rules for search queries.
    1763          */
    1764         $search_rewrite = apply_filters( 'search_rewrite_rules', $search_rewrite );
    1765 
    1766         // Author rewrite rules.
    1767         $author_rewrite = $this->generate_rewrite_rules($this->get_author_permastruct(), EP_AUTHORS);
    1768 
    1769         /**
    1770          * Filter rewrite rules used for author archives.
    1771          *
    1772          * Likely author archives would include /author/author-name/, as well as
    1773          * pagination and feed paths for author archives.
    1774          *
    1775          * @since 1.5.0
    1776          *
    1777          * @param array $author_rewrite The rewrite rules for author archives.
    1778          */
    1779         $author_rewrite = apply_filters( 'author_rewrite_rules', $author_rewrite );
    1780 
    1781         // Pages rewrite rules.
    1782         $page_rewrite = $this->page_rewrite_rules();
    1783 
    1784         /**
    1785          * Filter rewrite rules used for "page" post type archives.
    1786          *
    1787          * @since 1.5.0
    1788          *
    1789          * @param array $page_rewrite The rewrite rules for the "page" post type.
    1790          */
    1791         $page_rewrite = apply_filters( 'page_rewrite_rules', $page_rewrite );
    1792 
    1793         // Extra permastructs.
    1794         foreach ( $this->extra_permastructs as $permastructname => $struct ) {
    1795             if ( is_array( $struct ) ) {
    1796                 if ( count( $struct ) == 2 )
    1797                     $rules = $this->generate_rewrite_rules( $struct[0], $struct[1] );
    1798                 else
    1799                     $rules = $this->generate_rewrite_rules( $struct['struct'], $struct['ep_mask'], $struct['paged'], $struct['feed'], $struct['forcomments'], $struct['walk_dirs'], $struct['endpoints'] );
    1800             } else {
    1801                 $rules = $this->generate_rewrite_rules( $struct );
    1802             }
    1803 
    1804             /**
    1805              * Filter rewrite rules used for individual permastructs.
    1806              *
    1807              * The dynamic portion of the hook name, `$permastructname`, refers
    1808              * to the name of the registered permastruct, e.g. 'post_tag' (tags),
    1809              * 'category' (categories), etc.
    1810              *
    1811              * @since 3.1.0
    1812              *
    1813              * @param array $rules The rewrite rules generated for the current permastruct.
    1814              */
    1815             $rules = apply_filters( $permastructname . '_rewrite_rules', $rules );
    1816             if ( 'post_tag' == $permastructname ) {
    1817 
    1818                 /**
    1819                  * Filter rewrite rules used specifically for Tags.
    1820                  *
    1821                  * @since 2.3.0
    1822                  * @deprecated 3.1.0 Use 'post_tag_rewrite_rules' instead
    1823                  *
    1824                  * @param array $rules The rewrite rules generated for tags.
    1825                  */
    1826                 $rules = apply_filters( 'tag_rewrite_rules', $rules );
    1827             }
    1828 
    1829             $this->extra_rules_top = array_merge($this->extra_rules_top, $rules);
    1830         }
    1831 
    1832         // Put them together.
    1833         if ( $this->use_verbose_page_rules )
    1834             $this->rules = array_merge($this->extra_rules_top, $robots_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite,  $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules);
    1835         else
    1836             $this->rules = array_merge($this->extra_rules_top, $robots_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite,  $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules);
    1837 
    1838         /**
    1839          * Fires after the rewrite rules are generated.
    1840          *
    1841          * @since 1.5.0
    1842          *
    1843          * @param WP_Rewrite $this Current WP_Rewrite instance, passed by reference.
    1844          */
    1845         do_action_ref_array( 'generate_rewrite_rules', array( &$this ) );
    1846 
    1847         /**
    1848          * Filter the full set of generated rewrite rules.
    1849          *
    1850          * @since 1.5.0
    1851          *
    1852          * @param array $this->rules The compiled array of rewrite rules.
    1853          */
    1854         $this->rules = apply_filters( 'rewrite_rules_array', $this->rules );
    1855 
    1856         return $this->rules;
    1857     }
    1858 
    1859     /**
    1860      * Retrieve the rewrite rules.
    1861      *
    1862      * The difference between this method and {@link
    1863      * WP_Rewrite::rewrite_rules()} is that this method stores the rewrite rules
    1864      * in the 'rewrite_rules' option and retrieves it. This prevents having to
    1865      * process all of the permalinks to get the rewrite rules in the form of
    1866      * caching.
    1867      *
    1868      * @since 1.5.0
    1869      * @access public
    1870      *
    1871      * @return array Rewrite rules.
    1872      */
    1873     public function wp_rewrite_rules() {
    1874         $this->rules = get_option('rewrite_rules');
    1875         if ( empty($this->rules) ) {
    1876             $this->matches = 'matches';
    1877             $this->rewrite_rules();
    1878             update_option('rewrite_rules', $this->rules);
    1879         }
    1880 
    1881         return $this->rules;
    1882     }
    1883 
    1884     /**
    1885      * Retrieve mod_rewrite formatted rewrite rules to write to .htaccess.
    1886      *
    1887      * Does not actually write to the .htaccess file, but creates the rules for
    1888      * the process that will.
    1889      *
    1890      * Will add the non_wp_rules property rules to the .htaccess file before
    1891      * the WordPress rewrite rules one.
    1892      *
    1893      * @since 1.5.0
    1894      * @access public
    1895      *
    1896      * @return string
    1897      */
    1898     public function mod_rewrite_rules() {
    1899         if ( ! $this->using_permalinks() )
    1900             return '';
    1901 
    1902         $site_root = parse_url( site_url() );
    1903         if ( isset( $site_root['path'] ) )
    1904             $site_root = trailingslashit($site_root['path']);
    1905 
    1906         $home_root = parse_url(home_url());
    1907         if ( isset( $home_root['path'] ) )
    1908             $home_root = trailingslashit($home_root['path']);
    1909         else
    1910             $home_root = '/';
    1911 
    1912         $rules = "<IfModule mod_rewrite.c>\n";
    1913         $rules .= "RewriteEngine On\n";
    1914         $rules .= "RewriteBase $home_root\n";
    1915         $rules .= "RewriteRule ^index\.php$ - [L]\n"; // Prevent -f checks on index.php.
    1916 
    1917         //add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all)
    1918         foreach ( (array) $this->non_wp_rules as $match => $query) {
    1919             // Apache 1.3 does not support the reluctant (non-greedy) modifier.
    1920             $match = str_replace('.+?', '.+', $match);
    1921 
    1922             // If the match is unanchored and greedy, prepend rewrite conditions
    1923             // to avoid infinite redirects and eclipsing of real files.
    1924             //if ($match == '(.+)/?$' || $match == '([^/]+)/?$' ) {
    1925                 //nada.
    1926             //}
    1927 
    1928             $rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
    1929         }
    1930 
    1931         if ( $this->use_verbose_rules ) {
    1932             $this->matches = '';
    1933             $rewrite = $this->rewrite_rules();
    1934             $num_rules = count($rewrite);
    1935             $rules .= "RewriteCond %{REQUEST_FILENAME} -f [OR]\n" .
    1936                 "RewriteCond %{REQUEST_FILENAME} -d\n" .
    1937                 "RewriteRule ^.*$ - [S=$num_rules]\n";
    1938 
    1939             foreach ( (array) $rewrite as $match => $query) {
    1940                 // Apache 1.3 does not support the reluctant (non-greedy) modifier.
    1941                 $match = str_replace('.+?', '.+', $match);
    1942 
    1943                 // If the match is unanchored and greedy, prepend rewrite conditions
    1944                 // to avoid infinite redirects and eclipsing of real files.
    1945                 //if ($match == '(.+)/?$' || $match == '([^/]+)/?$' ) {
    1946                     //nada.
    1947                 //}
    1948 
    1949                 if ( strpos($query, $this->index) !== false )
    1950                     $rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
    1951                 else
    1952                     $rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA,L]\n";
    1953             }
    1954         } else {
    1955             $rules .= "RewriteCond %{REQUEST_FILENAME} !-f\n" .
    1956                 "RewriteCond %{REQUEST_FILENAME} !-d\n" .
    1957                 "RewriteRule . {$home_root}{$this->index} [L]\n";
    1958         }
    1959 
    1960         $rules .= "</IfModule>\n";
    1961 
    1962         /**
    1963          *
    1964          * Filter the list of rewrite rules formatted for output to an .htaccess file.
    1965          *
    1966          * @since 1.5.0
    1967          *
    1968          * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
    1969          */
    1970         $rules = apply_filters( 'mod_rewrite_rules', $rules );
    1971 
    1972         /**
    1973          * Filter the list of rewrite rules formatted for output to an .htaccess file.
    1974          *
    1975          * @since 1.5.0
    1976          * @deprecated 1.5.0 Use the mod_rewrite_rules filter instead.
    1977          *
    1978          * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
    1979          */
    1980         return apply_filters( 'rewrite_rules', $rules );
    1981     }
    1982 
    1983     /**
    1984      * Retrieve IIS7 URL Rewrite formatted rewrite rules to write to web.config file.
    1985      *
    1986      * Does not actually write to the web.config file, but creates the rules for
    1987      * the process that will.
    1988      *
    1989      * @since 2.8.0
    1990      * @access public
    1991      *
    1992      * @return string
    1993      */
    1994     public function iis7_url_rewrite_rules( $add_parent_tags = false ) {
    1995         if ( ! $this->using_permalinks() )
    1996             return '';
    1997         $rules = '';
    1998         if ( $add_parent_tags ) {
    1999             $rules .= '<configuration>
    2000     <system.webServer>
    2001         <rewrite>
    2002             <rules>';
    2003         }
    2004 
    2005         $rules .= '
    2006             <rule name="wordpress" patternSyntax="Wildcard">
    2007                 <match url="*" />
    2008                     <conditions>
    2009                         <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    2010                         <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
    2011                     </conditions>
    2012                 <action type="Rewrite" url="index.php" />
    2013             </rule>';
    2014 
    2015         if ( $add_parent_tags ) {
    2016             $rules .= '
    2017             </rules>
    2018         </rewrite>
    2019     </system.webServer>
    2020 </configuration>';
    2021         }
    2022 
    2023         /**
    2024          * Filter the list of rewrite rules formatted for output to a web.config.
    2025          *
    2026          * @since 2.8.0
    2027          *
    2028          * @param string $rules Rewrite rules formatted for IIS web.config.
    2029          */
    2030         return apply_filters( 'iis7_url_rewrite_rules', $rules );
    2031     }
    2032 
    2033     /**
    2034      * Add a straight rewrite rule.
    2035      *
    2036      * Any value in the $after parameter that isn't 'bottom' will be placed at
    2037      * the top of the rules.
    2038      *
    2039      * @since 2.1.0
    2040      * @access public
    2041      *
    2042      * @param string $regex    Regular expression to match against request.
    2043      * @param string $redirect URL regex redirects to when regex matches request.
    2044      * @param string $after    Optional, default is bottom. Location to place rule.
    2045      */
    2046     public function add_rule($regex, $redirect, $after = 'bottom') {
    2047         //get everything up to the first ?
    2048         $index = (strpos($redirect, '?') === false ? strlen($redirect) : strpos($redirect, '?'));
    2049         $front = substr($redirect, 0, $index);
    2050         if ( $front != $this->index ) { //it doesn't redirect to WP's index.php
    2051             $this->add_external_rule($regex, $redirect);
    2052         } else {
    2053             if ( 'bottom' == $after)
    2054                 $this->extra_rules = array_merge($this->extra_rules, array($regex => $redirect));
    2055             else
    2056                 $this->extra_rules_top = array_merge($this->extra_rules_top, array($regex => $redirect));
    2057             //$this->extra_rules[$regex] = $redirect;
    2058         }
    2059     }
    2060 
    2061     /**
    2062      * Add a rule that doesn't redirect to index.php.
    2063      *
    2064      * Can redirect to any place.
    2065      *
    2066      * @since 2.1.0
    2067      * @access public
    2068      *
    2069      * @param string $regex    Regular expression to match against request.
    2070      * @param string $redirect URL regex redirects to when regex matches request.
    2071      */
    2072     public function add_external_rule($regex, $redirect) {
    2073         $this->non_wp_rules[$regex] = $redirect;
    2074     }
    2075 
    2076     /**
    2077      * Add an endpoint, like /trackback/.
    2078      *
    2079      * @since 2.1.0
    2080      * @since 3.9.0 $query_var parameter added.
    2081      * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
    2082      * @access public
    2083      *
    2084      * @see add_rewrite_endpoint() for full documentation.
    2085      *
    2086      * @global WP $wp
    2087      *
    2088      * @param string      $name      Name of the endpoint.
    2089      * @param int         $places    Endpoint mask describing the places the endpoint should be added.
    2090      * @param string|bool $query_var Optional. Name of the corresponding query variable. Pass `false` to
    2091      *                               skip registering a query_var for this endpoint. Defaults to the
    2092      *                               value of `$name`.
    2093      */
    2094     public function add_endpoint( $name, $places, $query_var = true ) {
    2095         global $wp;
    2096 
    2097         // For backward compatibility, if `null` has explicitly been passed as `$query_var`, assume `true`.
    2098         if ( true === $query_var || null === func_get_arg( 2 ) ) {
    2099             $query_var = $name;
    2100         }
    2101         $this->endpoints[] = array( $places, $name, $query_var );
    2102 
    2103         if ( $query_var ) {
    2104             $wp->add_query_var( $query_var );
    2105         }
    2106     }
    2107 
    2108     /**
    2109      * Add a new permalink structure.
    2110      *
    2111      * A permalink structure (permastruct) is an abstract definition of a set of rewrite rules; it
    2112      * is an easy way of expressing a set of regular expressions that rewrite to a set of query strings.
    2113      * The new permastruct is added to the {@link WP_Rewrite::$extra_permastructs} array. When the
    2114      * rewrite rules are built by {@link WP_Rewrite::rewrite_rules()} all of these extra permastructs
    2115      * are passed to {@link WP_Rewrite::generate_rewrite_rules()} which transforms them into the
    2116      * regular expressions that many love to hate.
    2117      *
    2118      * The $args parameter gives you control over how {@link WP_Rewrite::generate_rewrite_rules()}
    2119      * works on the new permastruct.
    2120      *
    2121      * @since 2.5.0
    2122      * @access public
    2123      *
    2124      * @param string $name   Name for permalink structure.
    2125      * @param string $struct Permalink structure (e.g. category/%category%)
    2126      * @param array  $args   Optional configuration for building the rules from the permalink structure:
    2127      *     - with_front (bool) - Should the structure be prepended with WP_Rewrite::$front? Default is true.
    2128      *     - ep_mask (int) - Endpoint mask defining what endpoints are added to the structure. Default is EP_NONE.
    2129      *     - paged (bool) - Should archive pagination rules be added for the structure? Default is true.
    2130      *     - feed (bool) - Should feed rewrite rules be added for the structure? Default is true.
    2131      *     - forcomments (bool) - Should the feed rules be a query for a comments feed? Default is false.
    2132      *     - walk_dirs (bool) - Should the 'directories' making up the structure be walked over and rewrite
    2133      *                          rules built for each in turn? Default is true.
    2134      *     - endpoints (bool) - Should endpoints be applied to the generated rewrite rules? Default is true.
    2135      */
    2136     public function add_permastruct( $name, $struct, $args = array() ) {
    2137         // backwards compatibility for the old parameters: $with_front and $ep_mask
    2138         if ( ! is_array( $args ) )
    2139             $args = array( 'with_front' => $args );
    2140         if ( func_num_args() == 4 )
    2141             $args['ep_mask'] = func_get_arg( 3 );
    2142 
    2143         $defaults = array(
    2144             'with_front' => true,
    2145             'ep_mask' => EP_NONE,
    2146             'paged' => true,
    2147             'feed' => true,
    2148             'forcomments' => false,
    2149             'walk_dirs' => true,
    2150             'endpoints' => true,
    2151         );
    2152         $args = array_intersect_key( $args, $defaults );
    2153         $args = wp_parse_args( $args, $defaults );
    2154 
    2155         if ( $args['with_front'] )
    2156             $struct = $this->front . $struct;
    2157         else
    2158             $struct = $this->root . $struct;
    2159         $args['struct'] = $struct;
    2160 
    2161         $this->extra_permastructs[ $name ] = $args;
    2162     }
    2163 
    2164     /**
    2165      * Remove rewrite rules and then recreate rewrite rules.
    2166      *
    2167      * Calls {@link WP_Rewrite::wp_rewrite_rules()} after removing the
    2168      * 'rewrite_rules' option. If the function named 'save_mod_rewrite_rules'
    2169      * exists, it will be called.
    2170      *
    2171      * @since 2.0.1
    2172      * @access public
    2173      *
    2174      * @staticvar bool $do_hard_later
    2175      *
    2176      * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
    2177      */
    2178     public function flush_rules( $hard = true ) {
    2179         static $do_hard_later = null;
    2180 
    2181         // Prevent this action from running before everyone has registered their rewrites
    2182         if ( ! did_action( 'wp_loaded' ) ) {
    2183             add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
    2184             $do_hard_later = ( isset( $do_hard_later ) ) ? $do_hard_later || $hard : $hard;
    2185             return;
    2186         }
    2187 
    2188         if ( isset( $do_hard_later ) ) {
    2189             $hard = $do_hard_later;
    2190             unset( $do_hard_later );
    2191         }
    2192 
    2193         delete_option('rewrite_rules');
    2194         $this->wp_rewrite_rules();
    2195         /**
    2196          * Filter whether a "hard" rewrite rule flush should be performed when requested.
    2197          *
    2198          * A "hard" flush updates .htaccess (Apache) or web.config (IIS).
    2199          *
    2200          * @since 3.7.0
    2201          *
    2202          * @param bool $hard Whether to flush rewrite rules "hard". Default true.
    2203          */
    2204         if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) ) {
    2205             return;
    2206         }
    2207         if ( function_exists( 'save_mod_rewrite_rules' ) )
    2208             save_mod_rewrite_rules();
    2209         if ( function_exists( 'iis7_save_url_rewrite_rules' ) )
    2210             iis7_save_url_rewrite_rules();
    2211     }
    2212 
    2213     /**
    2214      * Sets up the object's properties.
    2215      *
    2216      * The 'use_verbose_page_rules' object property will be set to true if the
    2217      * permalink structure begins with one of the following: '%postname%', '%category%',
    2218      * '%tag%', or '%author%'.
    2219      *
    2220      * @since 1.5.0
    2221      * @access public
    2222      */
    2223     public function init() {
    2224         $this->extra_rules = $this->non_wp_rules = $this->endpoints = array();
    2225         $this->permalink_structure = get_option('permalink_structure');
    2226         $this->front = substr($this->permalink_structure, 0, strpos($this->permalink_structure, '%'));
    2227         $this->root = '';
    2228         if ( $this->using_index_permalinks() )
    2229             $this->root = $this->index . '/';
    2230         unset($this->author_structure);
    2231         unset($this->date_structure);
    2232         unset($this->page_structure);
    2233         unset($this->search_structure);
    2234         unset($this->feed_structure);
    2235         unset($this->comment_feed_structure);
    2236         $this->use_trailing_slashes = ( '/' == substr($this->permalink_structure, -1, 1) );
    2237 
    2238         // Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
    2239         if ( preg_match("/^[^%]*%(?:postname|category|tag|author)%/", $this->permalink_structure) )
    2240              $this->use_verbose_page_rules = true;
    2241         else
    2242             $this->use_verbose_page_rules = false;
    2243     }
    2244 
    2245     /**
    2246      * Set the main permalink structure for the blog.
    2247      *
    2248      * Will update the 'permalink_structure' option, if there is a difference
    2249      * between the current permalink structure and the parameter value. Calls
    2250      * {@link WP_Rewrite::init()} after the option is updated.
    2251      *
    2252      * Fires the 'permalink_structure_changed' action once the init call has
    2253      * processed passing the old and new values
    2254      *
    2255      * @since 1.5.0
    2256      * @access public
    2257      *
    2258      * @param string $permalink_structure Permalink structure.
    2259      */
    2260     public function set_permalink_structure($permalink_structure) {
    2261         if ( $permalink_structure != $this->permalink_structure ) {
    2262             $old_permalink_structure = $this->permalink_structure;
    2263             update_option('permalink_structure', $permalink_structure);
    2264             $this->init();
    2265 
    2266             /**
    2267              * Fires after the permalink structure is updated.
    2268              *
    2269              * @since 2.8.0
    2270              *
    2271              * @param string $old_permalink_structure The previous permalink structure.
    2272              * @param string $permalink_structure     The new permalink structure.
    2273              */
    2274             do_action( 'permalink_structure_changed', $old_permalink_structure, $permalink_structure );
    2275         }
    2276     }
    2277 
    2278     /**
    2279      * Set the category base for the category permalink.
    2280      *
    2281      * Will update the 'category_base' option, if there is a difference between
    2282      * the current category base and the parameter value. Calls
    2283      * {@link WP_Rewrite::init()} after the option is updated.
    2284      *
    2285      * @since 1.5.0
    2286      * @access public
    2287      *
    2288      * @param string $category_base Category permalink structure base.
    2289      */
    2290     public function set_category_base($category_base) {
    2291         if ( $category_base != get_option('category_base') ) {
    2292             update_option('category_base', $category_base);
    2293             $this->init();
    2294         }
    2295     }
    2296 
    2297     /**
    2298      * Set the tag base for the tag permalink.
    2299      *
    2300      * Will update the 'tag_base' option, if there is a difference between the
    2301      * current tag base and the parameter value. Calls
    2302      * {@link WP_Rewrite::init()} after the option is updated.
    2303      *
    2304      * @since 2.3.0
    2305      * @access public
    2306      *
    2307      * @param string $tag_base Tag permalink structure base.
    2308      */
    2309     public function set_tag_base( $tag_base ) {
    2310         if ( $tag_base != get_option( 'tag_base') ) {
    2311             update_option( 'tag_base', $tag_base );
    2312             $this->init();
    2313         }
    2314     }
    2315 
    2316     /**
    2317      * Constructor - Calls init(), which runs setup.
    2318      *
    2319      * @since 1.5.0
    2320      * @access public
    2321      *
    2322      */
    2323     public function __construct() {
    2324         $this->init();
    2325     }
    2326 }
  • trunk/src/wp-includes/rewrite-functions.php

    r33746 r33751  
    115115    $wp_rewrite->flush_rules( $hard );
    116116}
    117 
    118 /**
    119  * Endpoint Mask for default, which is nothing.
    120  *
    121  * @since 2.1.0
    122  */
    123 define('EP_NONE', 0);
    124 
    125 /**
    126  * Endpoint Mask for Permalink.
    127  *
    128  * @since 2.1.0
    129  */
    130 define('EP_PERMALINK', 1);
    131 
    132 /**
    133  * Endpoint Mask for Attachment.
    134  *
    135  * @since 2.1.0
    136  */
    137 define('EP_ATTACHMENT', 2);
    138 
    139 /**
    140  * Endpoint Mask for date.
    141  *
    142  * @since 2.1.0
    143  */
    144 define('EP_DATE', 4);
    145 
    146 /**
    147  * Endpoint Mask for year
    148  *
    149  * @since 2.1.0
    150  */
    151 define('EP_YEAR', 8);
    152 
    153 /**
    154  * Endpoint Mask for month.
    155  *
    156  * @since 2.1.0
    157  */
    158 define('EP_MONTH', 16);
    159 
    160 /**
    161  * Endpoint Mask for day.
    162  *
    163  * @since 2.1.0
    164  */
    165 define('EP_DAY', 32);
    166 
    167 /**
    168  * Endpoint Mask for root.
    169  *
    170  * @since 2.1.0
    171  */
    172 define('EP_ROOT', 64);
    173 
    174 /**
    175  * Endpoint Mask for comments.
    176  *
    177  * @since 2.1.0
    178  */
    179 define('EP_COMMENTS', 128);
    180 
    181 /**
    182  * Endpoint Mask for searches.
    183  *
    184  * @since 2.1.0
    185  */
    186 define('EP_SEARCH', 256);
    187 
    188 /**
    189  * Endpoint Mask for categories.
    190  *
    191  * @since 2.1.0
    192  */
    193 define('EP_CATEGORIES', 512);
    194 
    195 /**
    196  * Endpoint Mask for tags.
    197  *
    198  * @since 2.3.0
    199  */
    200 define('EP_TAGS', 1024);
    201 
    202 /**
    203  * Endpoint Mask for authors.
    204  *
    205  * @since 2.1.0
    206  */
    207 define('EP_AUTHORS', 2048);
    208 
    209 /**
    210  * Endpoint Mask for pages.
    211  *
    212  * @since 2.1.0
    213  */
    214 define('EP_PAGES', 4096);
    215 
    216 /**
    217  * Endpoint Mask for all archive views.
    218  *
    219  * @since 3.7.0
    220  */
    221 define( 'EP_ALL_ARCHIVES', EP_DATE | EP_YEAR | EP_MONTH | EP_DAY | EP_CATEGORIES | EP_TAGS | EP_AUTHORS );
    222 
    223 /**
    224  * Endpoint Mask for everything.
    225  *
    226  * @since 2.1.0
    227  */
    228 define( 'EP_ALL', EP_PERMALINK | EP_ATTACHMENT | EP_ROOT | EP_COMMENTS | EP_SEARCH | EP_PAGES | EP_ALL_ARCHIVES );
    229117
    230118/**
     
    530418    return 0;
    531419}
    532 
    533 /**
    534  * WordPress Rewrite Component.
    535  *
    536  * The WordPress Rewrite class writes the rewrite module rules to the .htaccess
    537  * file. It also handles parsing the request to get the correct setup for the
    538  * WordPress Query class.
    539  *
    540  * The Rewrite along with WP class function as a front controller for WordPress.
    541  * You can add rules to trigger your page view and processing using this
    542  * component. The full functionality of a front controller does not exist,
    543  * meaning you can't define how the template files load based on the rewrite
    544  * rules.
    545  *
    546  * @since 1.5.0
    547  */
    548 class WP_Rewrite {
    549     /**
    550      * Permalink structure for posts.
    551      *
    552      * @since 1.5.0
    553      * @var string
    554      */
    555     public $permalink_structure;
    556 
    557     /**
    558      * Whether to add trailing slashes.
    559      *
    560      * @since 2.2.0
    561      * @var bool
    562      */
    563     public $use_trailing_slashes;
    564 
    565     /**
    566      * Base for the author permalink structure (example.com/$author_base/authorname).
    567      *
    568      * @since 1.5.0
    569      * @access private
    570      * @var string
    571      */
    572     var $author_base = 'author';
    573 
    574     /**
    575      * Permalink structure for author archives.
    576      *
    577      * @since 1.5.0
    578      * @access private
    579      * @var string
    580      */
    581     var $author_structure;
    582 
    583     /**
    584      * Permalink structure for date archives.
    585      *
    586      * @since 1.5.0
    587      * @access private
    588      * @var string
    589      */
    590     var $date_structure;
    591 
    592     /**
    593      * Permalink structure for pages.
    594      *
    595      * @since 1.5.0
    596      * @access private
    597      * @var string
    598      */
    599     var $page_structure;
    600 
    601     /**
    602      * Base of the search permalink structure (example.com/$search_base/query).
    603      *
    604      * @since 1.5.0
    605      * @access private
    606      * @var string
    607      */
    608     var $search_base = 'search';
    609 
    610     /**
    611      * Permalink structure for searches.
    612      *
    613      * @since 1.5.0
    614      * @access private
    615      * @var string
    616      */
    617     var $search_structure;
    618 
    619     /**
    620      * Comments permalink base.
    621      *
    622      * @since 1.5.0
    623      * @access private
    624      * @var string
    625      */
    626     var $comments_base = 'comments';
    627 
    628     /**
    629      * Pagination permalink base.
    630      *
    631      * @since 3.1.0
    632      * @var string
    633      */
    634     public $pagination_base = 'page';
    635 
    636     /**
    637      * Comments pagination permalink base.
    638      *
    639      * @since 4.2.0
    640      * @access private
    641      * @var string
    642      */
    643     var $comments_pagination_base = 'comment-page';
    644 
    645     /**
    646      * Feed permalink base.
    647      *
    648      * @since 1.5.0
    649      * @access private
    650      * @var string
    651      */
    652     var $feed_base = 'feed';
    653 
    654     /**
    655      * Comments feed permalink structure.
    656      *
    657      * @since 1.5.0
    658      * @access private
    659      * @var string
    660      */
    661     var $comment_feed_structure;
    662 
    663     /**
    664      * Feed request permalink structure.
    665      *
    666      * @since 1.5.0
    667      * @access private
    668      * @var string
    669      */
    670     var $feed_structure;
    671 
    672     /**
    673      * The static portion of the post permalink structure.
    674      *
    675      * If the permalink structure is "/archive/%post_id%" then the front
    676      * is "/archive/". If the permalink structure is "/%year%/%postname%/"
    677      * then the front is "/".
    678      *
    679      * @see WP_Rewrite::init()
    680      * @since 1.5.0
    681      * @var string
    682      */
    683     public $front;
    684 
    685     /**
    686      * The prefix for all permalink structures.
    687      *
    688      * If PATHINFO/index permalinks are in use then the root is the value of
    689      * {@link WP_Rewrite::$index} with a trailing slash appended. Otherwise
    690      * the root will be empty.
    691      *
    692      * @see WP_Rewrite::init()
    693      * @see WP_Rewrite::using_index_permalinks()
    694      * @since 1.5.0
    695      * @var string
    696      */
    697     public $root = '';
    698 
    699     /**
    700      * The name of the index file which is the entry point to all requests.
    701      *
    702      * @since 1.5.0
    703      * @access public
    704      * @var string
    705      */
    706     public $index = 'index.php';
    707 
    708     /**
    709      * Variable name to use for regex matches in the rewritten query.
    710      *
    711      * @since 1.5.0
    712      * @access private
    713      * @var string
    714      */
    715     var $matches = '';
    716 
    717     /**
    718      * Rewrite rules to match against the request to find the redirect or query.
    719      *
    720      * @since 1.5.0
    721      * @access private
    722      * @var array
    723      */
    724     var $rules;
    725 
    726     /**
    727      * Additional rules added external to the rewrite class.
    728      *
    729      * Those not generated by the class, see add_rewrite_rule().
    730      *
    731      * @since 2.1.0
    732      * @access private
    733      * @var array
    734      */
    735     var $extra_rules = array();
    736 
    737     /**
    738      * Additional rules that belong at the beginning to match first.
    739      *
    740      * Those not generated by the class, see add_rewrite_rule().
    741      *
    742      * @since 2.3.0
    743      * @access private
    744      * @var array
    745      */
    746     var $extra_rules_top = array();
    747 
    748     /**
    749      * Rules that don't redirect to WordPress' index.php.
    750      *
    751      * These rules are written to the mod_rewrite portion of the .htaccess,
    752      * and are added by {@link add_external_rule()}.
    753      *
    754      * @since 2.1.0
    755      * @access private
    756      * @var array
    757      */
    758     var $non_wp_rules = array();
    759 
    760     /**
    761      * Extra permalink structures, e.g. categories, added by {@link add_permastruct()}.
    762      *
    763      * @since 2.1.0
    764      * @access private
    765      * @var array
    766      */
    767     var $extra_permastructs = array();
    768 
    769     /**
    770      * Endpoints (like /trackback/) added by {@link add_rewrite_endpoint()}.
    771      *
    772      * @since 2.1.0
    773      * @access private
    774      * @var array
    775      */
    776     var $endpoints;
    777 
    778     /**
    779      * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
    780      *
    781      * This is off by default, turning it on might print a lot of rewrite rules
    782      * to the .htaccess file.
    783      *
    784      * @see WP_Rewrite::mod_rewrite_rules()
    785      * @since 2.0.0
    786      * @access public
    787      * @var bool
    788      */
    789     public $use_verbose_rules = false;
    790 
    791     /**
    792      * Could post permalinks be confused with those of pages?
    793      *
    794      * If the first rewrite tag in the post permalink structure is one that could
    795      * also match a page name (e.g. %postname% or %author%) then this flag is
    796      * set to true. Prior to WordPress 3.3 this flag indicated that every page
    797      * would have a set of rules added to the top of the rewrite rules array.
    798      * Now it tells {@link WP::parse_request()} to check if a URL matching the
    799      * page permastruct is actually a page before accepting it.
    800      *
    801      * @link https://core.trac.wordpress.org/ticket/16687
    802      * @see WP_Rewrite::init()
    803      * @since 2.5.0
    804      * @access public
    805      * @var bool
    806      */
    807     public $use_verbose_page_rules = true;
    808 
    809     /**
    810      * Rewrite tags that can be used in permalink structures.
    811      *
    812      * These are translated into the regular expressions stored in
    813      * {@link WP_Rewrite::$rewritereplace} and are rewritten to the
    814      * query variables listed in {@link WP_Rewrite::$queryreplace}.
    815      *
    816      * Additional tags can be added with {@link add_rewrite_tag()}.
    817      *
    818      * @since 1.5.0
    819      * @access private
    820      * @var array
    821      */
    822     var $rewritecode = array(
    823         '%year%',
    824         '%monthnum%',
    825         '%day%',
    826         '%hour%',
    827         '%minute%',
    828         '%second%',
    829         '%postname%',
    830         '%post_id%',
    831         '%author%',
    832         '%pagename%',
    833         '%search%'
    834     );
    835 
    836     /**
    837      * Regular expressions to be substituted into rewrite rules in place
    838      * of rewrite tags, see {@link WP_Rewrite::$rewritecode}.
    839      *
    840      * @since 1.5.0
    841      * @access private
    842      * @var array
    843      */
    844     var $rewritereplace = array(
    845         '([0-9]{4})',
    846         '([0-9]{1,2})',
    847         '([0-9]{1,2})',
    848         '([0-9]{1,2})',
    849         '([0-9]{1,2})',
    850         '([0-9]{1,2})',
    851         '([^/]+)',
    852         '([0-9]+)',
    853         '([^/]+)',
    854         '([^/]+?)',
    855         '(.+)'
    856     );
    857 
    858     /**
    859      * Query variables that rewrite tags map to, see {@link WP_Rewrite::$rewritecode}.
    860      *
    861      * @since 1.5.0
    862      * @access private
    863      * @var array
    864      */
    865     var $queryreplace = array(
    866         'year=',
    867         'monthnum=',
    868         'day=',
    869         'hour=',
    870         'minute=',
    871         'second=',
    872         'name=',
    873         'p=',
    874         'author_name=',
    875         'pagename=',
    876         's='
    877     );
    878 
    879     /**
    880      * Supported default feeds.
    881      *
    882      * @since 1.5.0
    883      * @var array
    884      */
    885     public $feeds = array( 'feed', 'rdf', 'rss', 'rss2', 'atom' );
    886 
    887     /**
    888      * Whether permalinks are being used.
    889      *
    890      * This can be either rewrite module or permalink in the HTTP query string.
    891      *
    892      * @since 1.5.0
    893      * @access public
    894      *
    895      * @return bool True, if permalinks are enabled.
    896      */
    897     public function using_permalinks() {
    898         return ! empty($this->permalink_structure);
    899     }
    900 
    901     /**
    902      * Whether permalinks are being used and rewrite module is not enabled.
    903      *
    904      * Means that permalink links are enabled and index.php is in the URL.
    905      *
    906      * @since 1.5.0
    907      * @access public
    908      *
    909      * @return bool
    910      */
    911     public function using_index_permalinks() {
    912         if ( empty( $this->permalink_structure ) ) {
    913             return false;
    914         }
    915         // If the index is not in the permalink, we're using mod_rewrite.
    916         return preg_match( '#^/*' . $this->index . '#', $this->permalink_structure );
    917     }
    918 
    919     /**
    920      * Whether permalinks are being used and rewrite module is enabled.
    921      *
    922      * Using permalinks and index.php is not in the URL.
    923      *
    924      * @since 1.5.0
    925      * @access public
    926      *
    927      * @return bool
    928      */
    929     public function using_mod_rewrite_permalinks() {
    930         return $this->using_permalinks() && ! $this->using_index_permalinks();
    931     }
    932 
    933     /**
    934      * Index for matches for usage in preg_*() functions.
    935      *
    936      * The format of the string is, with empty matches property value, '$NUM'.
    937      * The 'NUM' will be replaced with the value in the $number parameter. With
    938      * the matches property not empty, the value of the returned string will
    939      * contain that value of the matches property. The format then will be
    940      * '$MATCHES[NUM]', with MATCHES as the value in the property and NUM the
    941      * value of the $number parameter.
    942      *
    943      * @since 1.5.0
    944      * @access public
    945      *
    946      * @param int $number Index number.
    947      * @return string
    948      */
    949     public function preg_index($number) {
    950         $match_prefix = '$';
    951         $match_suffix = '';
    952 
    953         if ( ! empty($this->matches) ) {
    954             $match_prefix = '$' . $this->matches . '[';
    955             $match_suffix = ']';
    956         }
    957 
    958         return "$match_prefix$number$match_suffix";
    959     }
    960 
    961     /**
    962      * Retrieve all page and attachments for pages URIs.
    963      *
    964      * The attachments are for those that have pages as parents and will be
    965      * retrieved.
    966      *
    967      * @since 2.5.0
    968      * @access public
    969      *
    970      * @global wpdb $wpdb
    971      *
    972      * @return array Array of page URIs as first element and attachment URIs as second element.
    973      */
    974     public function page_uri_index() {
    975         global $wpdb;
    976 
    977         //get pages in order of hierarchy, i.e. children after parents
    978         $pages = $wpdb->get_results("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page' AND post_status != 'auto-draft'");
    979         $posts = get_page_hierarchy( $pages );
    980 
    981         // If we have no pages get out quick
    982         if ( !$posts )
    983             return array( array(), array() );
    984 
    985         //now reverse it, because we need parents after children for rewrite rules to work properly
    986         $posts = array_reverse($posts, true);
    987 
    988         $page_uris = array();
    989         $page_attachment_uris = array();
    990 
    991         foreach ( $posts as $id => $post ) {
    992             // URL => page name
    993             $uri = get_page_uri($id);
    994             $attachments = $wpdb->get_results( $wpdb->prepare( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = %d", $id ));
    995             if ( !empty($attachments) ) {
    996                 foreach ( $attachments as $attachment ) {
    997                     $attach_uri = get_page_uri($attachment->ID);
    998                     $page_attachment_uris[$attach_uri] = $attachment->ID;
    999                 }
    1000             }
    1001 
    1002             $page_uris[$uri] = $id;
    1003         }
    1004 
    1005         return array( $page_uris, $page_attachment_uris );
    1006     }
    1007 
    1008     /**
    1009      * Retrieve all of the rewrite rules for pages.
    1010      *
    1011      * @since 1.5.0
    1012      * @access public
    1013      *
    1014      * @return array
    1015      */
    1016     public function page_rewrite_rules() {
    1017         // the extra .? at the beginning prevents clashes with other regular expressions in the rules array
    1018         $this->add_rewrite_tag( '%pagename%', '(.?.+?)', 'pagename=' );
    1019 
    1020         return $this->generate_rewrite_rules( $this->get_page_permastruct(), EP_PAGES, true, true, false, false );
    1021     }
    1022 
    1023     /**
    1024      * Retrieve date permalink structure, with year, month, and day.
    1025      *
    1026      * The permalink structure for the date, if not set already depends on the
    1027      * permalink structure. It can be one of three formats. The first is year,
    1028      * month, day; the second is day, month, year; and the last format is month,
    1029      * day, year. These are matched against the permalink structure for which
    1030      * one is used. If none matches, then the default will be used, which is
    1031      * year, month, day.
    1032      *
    1033      * Prevents post ID and date permalinks from overlapping. In the case of
    1034      * post_id, the date permalink will be prepended with front permalink with
    1035      * 'date/' before the actual permalink to form the complete date permalink
    1036      * structure.
    1037      *
    1038      * @since 1.5.0
    1039      * @access public
    1040      *
    1041      * @return string|false False on no permalink structure. Date permalink structure.
    1042      */
    1043     public function get_date_permastruct() {
    1044         if ( isset($this->date_structure) )
    1045             return $this->date_structure;
    1046 
    1047         if ( empty($this->permalink_structure) ) {
    1048             $this->date_structure = '';
    1049             return false;
    1050         }
    1051 
    1052         // The date permalink must have year, month, and day separated by slashes.
    1053         $endians = array('%year%/%monthnum%/%day%', '%day%/%monthnum%/%year%', '%monthnum%/%day%/%year%');
    1054 
    1055         $this->date_structure = '';
    1056         $date_endian = '';
    1057 
    1058         foreach ( $endians as $endian ) {
    1059             if ( false !== strpos($this->permalink_structure, $endian) ) {
    1060                 $date_endian= $endian;
    1061                 break;
    1062             }
    1063         }
    1064 
    1065         if ( empty($date_endian) )
    1066             $date_endian = '%year%/%monthnum%/%day%';
    1067 
    1068         // Do not allow the date tags and %post_id% to overlap in the permalink
    1069         // structure. If they do, move the date tags to $front/date/.
    1070         $front = $this->front;
    1071         preg_match_all('/%.+?%/', $this->permalink_structure, $tokens);
    1072         $tok_index = 1;
    1073         foreach ( (array) $tokens[0] as $token) {
    1074             if ( '%post_id%' == $token && ($tok_index <= 3) ) {
    1075                 $front = $front . 'date/';
    1076                 break;
    1077             }
    1078             $tok_index++;
    1079         }
    1080 
    1081         $this->date_structure = $front . $date_endian;
    1082 
    1083         return $this->date_structure;
    1084     }
    1085 
    1086     /**
    1087      * Retrieve the year permalink structure without month and day.
    1088      *
    1089      * Gets the date permalink structure and strips out the month and day
    1090      * permalink structures.
    1091      *
    1092      * @since 1.5.0
    1093      * @access public
    1094      *
    1095      * @return false|string False on failure. Year structure on success.
    1096      */
    1097     public function get_year_permastruct() {
    1098         $structure = $this->get_date_permastruct();
    1099 
    1100         if ( empty($structure) )
    1101             return false;
    1102 
    1103         $structure = str_replace('%monthnum%', '', $structure);
    1104         $structure = str_replace('%day%', '', $structure);
    1105         $structure = preg_replace('#/+#', '/', $structure);
    1106 
    1107         return $structure;
    1108     }
    1109 
    1110     /**
    1111      * Retrieve the month permalink structure without day and with year.
    1112      *
    1113      * Gets the date permalink structure and strips out the day permalink
    1114      * structures. Keeps the year permalink structure.
    1115      *
    1116      * @since 1.5.0
    1117      * @access public
    1118      *
    1119      * @return false|string False on failure. Year/Month structure on success.
    1120      */
    1121     public function get_month_permastruct() {
    1122         $structure = $this->get_date_permastruct();
    1123 
    1124         if ( empty($structure) )
    1125             return false;
    1126 
    1127         $structure = str_replace('%day%', '', $structure);
    1128         $structure = preg_replace('#/+#', '/', $structure);
    1129 
    1130         return $structure;
    1131     }
    1132 
    1133     /**
    1134      * Retrieve the day permalink structure with month and year.
    1135      *
    1136      * Keeps date permalink structure with all year, month, and day.
    1137      *
    1138      * @since 1.5.0
    1139      * @access public
    1140      *
    1141      * @return string|false False on failure. Year/Month/Day structure on success.
    1142      */
    1143     public function get_day_permastruct() {
    1144         return $this->get_date_permastruct();
    1145     }
    1146 
    1147     /**
    1148      * Retrieve the permalink structure for categories.
    1149      *
    1150      * If the category_base property has no value, then the category structure
    1151      * will have the front property value, followed by 'category', and finally
    1152      * '%category%'. If it does, then the root property will be used, along with
    1153      * the category_base property value.
    1154      *
    1155      * @since 1.5.0
    1156      * @access public
    1157      *
    1158      * @return string|false False on failure. Category permalink structure.
    1159      */
    1160     public function get_category_permastruct() {
    1161         return $this->get_extra_permastruct('category');
    1162     }
    1163 
    1164     /**
    1165      * Retrieve the permalink structure for tags.
    1166      *
    1167      * If the tag_base property has no value, then the tag structure will have
    1168      * the front property value, followed by 'tag', and finally '%tag%'. If it
    1169      * does, then the root property will be used, along with the tag_base
    1170      * property value.
    1171      *
    1172      * @since 2.3.0
    1173      * @access public
    1174      *
    1175      * @return string|false False on failure. Tag permalink structure.
    1176      */
    1177     public function get_tag_permastruct() {
    1178         return $this->get_extra_permastruct('post_tag');
    1179     }
    1180 
    1181     /**
    1182      * Retrieve extra permalink structure by name.
    1183      *
    1184      * @since 2.5.0
    1185      * @access public
    1186      *
    1187      * @param string $name Permalink structure name.
    1188      * @return string|false False if not found. Permalink structure string.
    1189      */
    1190     public function get_extra_permastruct($name) {
    1191         if ( empty($this->permalink_structure) )
    1192             return false;
    1193 
    1194         if ( isset($this->extra_permastructs[$name]) )
    1195             return $this->extra_permastructs[$name]['struct'];
    1196 
    1197         return false;
    1198     }
    1199 
    1200     /**
    1201      * Retrieve the author permalink structure.
    1202      *
    1203      * The permalink structure is front property, author base, and finally
    1204      * '/%author%'. Will set the author_structure property and then return it
    1205      * without attempting to set the value again.
    1206      *
    1207      * @since 1.5.0
    1208      * @access public
    1209      *
    1210      * @return string|false False if not found. Permalink structure string.
    1211      */
    1212     public function get_author_permastruct() {
    1213         if ( isset($this->author_structure) )
    1214             return $this->author_structure;
    1215 
    1216         if ( empty($this->permalink_structure) ) {
    1217             $this->author_structure = '';
    1218             return false;
    1219         }
    1220 
    1221         $this->author_structure = $this->front . $this->author_base . '/%author%';
    1222 
    1223         return $this->author_structure;
    1224     }
    1225 
    1226     /**
    1227      * Retrieve the search permalink structure.
    1228      *
    1229      * The permalink structure is root property, search base, and finally
    1230      * '/%search%'. Will set the search_structure property and then return it
    1231      * without attempting to set the value again.
    1232      *
    1233      * @since 1.5.0
    1234      * @access public
    1235      *
    1236      * @return string|false False if not found. Permalink structure string.
    1237      */
    1238     public function get_search_permastruct() {
    1239         if ( isset($this->search_structure) )
    1240             return $this->search_structure;
    1241 
    1242         if ( empty($this->permalink_structure) ) {
    1243             $this->search_structure = '';
    1244             return false;
    1245         }
    1246 
    1247         $this->search_structure = $this->root . $this->search_base . '/%search%';
    1248 
    1249         return $this->search_structure;
    1250     }
    1251 
    1252     /**
    1253      * Retrieve the page permalink structure.
    1254      *
    1255      * The permalink structure is root property, and '%pagename%'. Will set the
    1256      * page_structure property and then return it without attempting to set the
    1257      * value again.
    1258      *
    1259      * @since 1.5.0
    1260      * @access public
    1261      *
    1262      * @return string|false False if not found. Permalink structure string.
    1263      */
    1264     public function get_page_permastruct() {
    1265         if ( isset($this->page_structure) )
    1266             return $this->page_structure;
    1267 
    1268         if (empty($this->permalink_structure)) {
    1269             $this->page_structure = '';
    1270             return false;
    1271         }
    1272 
    1273         $this->page_structure = $this->root . '%pagename%';
    1274 
    1275         return $this->page_structure;
    1276     }
    1277 
    1278     /**
    1279      * Retrieve the feed permalink structure.
    1280      *
    1281      * The permalink structure is root property, feed base, and finally
    1282      * '/%feed%'. Will set the feed_structure property and then return it
    1283      * without attempting to set the value again.
    1284      *
    1285      * @since 1.5.0
    1286      * @access public
    1287      *
    1288      * @return string|false False if not found. Permalink structure string.
    1289      */
    1290     public function get_feed_permastruct() {
    1291         if ( isset($this->feed_structure) )
    1292             return $this->feed_structure;
    1293 
    1294         if ( empty($this->permalink_structure) ) {
    1295             $this->feed_structure = '';
    1296             return false;
    1297         }
    1298 
    1299         $this->feed_structure = $this->root . $this->feed_base . '/%feed%';
    1300 
    1301         return $this->feed_structure;
    1302     }
    1303 
    1304     /**
    1305      * Retrieve the comment feed permalink structure.
    1306      *
    1307      * The permalink structure is root property, comment base property, feed
    1308      * base and finally '/%feed%'. Will set the comment_feed_structure property
    1309      * and then return it without attempting to set the value again.
    1310      *
    1311      * @since 1.5.0
    1312      * @access public
    1313      *
    1314      * @return string|false False if not found. Permalink structure string.
    1315      */
    1316     public function get_comment_feed_permastruct() {
    1317         if ( isset($this->comment_feed_structure) )
    1318             return $this->comment_feed_structure;
    1319 
    1320         if (empty($this->permalink_structure)) {
    1321             $this->comment_feed_structure = '';
    1322             return false;
    1323         }
    1324 
    1325         $this->comment_feed_structure = $this->root . $this->comments_base . '/' . $this->feed_base . '/%feed%';
    1326 
    1327         return $this->comment_feed_structure;
    1328     }
    1329 
    1330     /**
    1331      * Add or update existing rewrite tags (e.g. %postname%).
    1332      *
    1333      * If the tag already exists, replace the existing pattern and query for
    1334      * that tag, otherwise add the new tag.
    1335      *
    1336      * @see WP_Rewrite::$rewritecode
    1337      * @see WP_Rewrite::$rewritereplace
    1338      * @see WP_Rewrite::$queryreplace
    1339      * @since 1.5.0
    1340      * @access public
    1341      *
    1342      * @param string $tag   Name of the rewrite tag to add or update.
    1343      * @param string $regex Regular expression to substitute the tag for in rewrite rules.
    1344      * @param string $query String to append to the rewritten query. Must end in '='.
    1345      */
    1346     public function add_rewrite_tag( $tag, $regex, $query ) {
    1347         $position = array_search( $tag, $this->rewritecode );
    1348         if ( false !== $position && null !== $position ) {
    1349             $this->rewritereplace[ $position ] = $regex;
    1350             $this->queryreplace[ $position ] = $query;
    1351         } else {
    1352             $this->rewritecode[] = $tag;
    1353             $this->rewritereplace[] = $regex;
    1354             $this->queryreplace[] = $query;
    1355         }
    1356     }
    1357 
    1358     /**
    1359      * Generate rewrite rules from a permalink structure.
    1360      *
    1361      * The main WP_Rewrite function for building the rewrite rule list. The
    1362      * contents of the function is a mix of black magic and regular expressions,
    1363      * so best just ignore the contents and move to the parameters.
    1364      *
    1365      * @since 1.5.0
    1366      * @access public
    1367      *
    1368      * @param string $permalink_structure The permalink structure.
    1369      * @param int    $ep_mask             Endpoint mask defining what endpoints are added to the structure. Default is EP_NONE.
    1370      * @param bool   $paged               Should archive pagination rules be added for the structure? Default is true.
    1371      * @param bool   $feed                Should feed rewrite rules be added for the structure? Default is true.
    1372      * @param bool   $forcomments         Should the feed rules be a query for a comments feed? Default is false.
    1373      * @param bool   $walk_dirs           Should the 'directories' making up the structure be walked over and rewrite rules
    1374      *                                    built for each in turn? Default is true.
    1375      * @param bool   $endpoints           Should endpoints be applied to the generated rewrite rules? Default is true.
    1376      * @return array Rewrite rule list.
    1377      */
    1378     public function generate_rewrite_rules($permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true) {
    1379         //build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
    1380         $feedregex2 = '';
    1381         foreach ( (array) $this->feeds as $feed_name)
    1382             $feedregex2 .= $feed_name . '|';
    1383         $feedregex2 = '(' . trim($feedregex2, '|') . ')/?$';
    1384 
    1385         //$feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom
    1386         //and <permalink>/atom are both possible
    1387         $feedregex = $this->feed_base . '/' . $feedregex2;
    1388 
    1389         //build a regex to match the trackback and page/xx parts of URLs
    1390         $trackbackregex = 'trackback/?$';
    1391         $pageregex = $this->pagination_base . '/?([0-9]{1,})/?$';
    1392         $commentregex = $this->comments_pagination_base . '-([0-9]{1,})/?$';
    1393 
    1394         //build up an array of endpoint regexes to append => queries to append
    1395         if ( $endpoints ) {
    1396             $ep_query_append = array ();
    1397             foreach ( (array) $this->endpoints as $endpoint) {
    1398                 //match everything after the endpoint name, but allow for nothing to appear there
    1399                 $epmatch = $endpoint[1] . '(/(.*))?/?$';
    1400                 //this will be appended on to the rest of the query for each dir
    1401                 $epquery = '&' . $endpoint[2] . '=';
    1402                 $ep_query_append[$epmatch] = array ( $endpoint[0], $epquery );
    1403             }
    1404         }
    1405 
    1406         //get everything up to the first rewrite tag
    1407         $front = substr($permalink_structure, 0, strpos($permalink_structure, '%'));
    1408         //build an array of the tags (note that said array ends up being in $tokens[0])
    1409         preg_match_all('/%.+?%/', $permalink_structure, $tokens);
    1410 
    1411         $num_tokens = count($tokens[0]);
    1412 
    1413         $index = $this->index; //probably 'index.php'
    1414         $feedindex = $index;
    1415         $trackbackindex = $index;
    1416         //build a list from the rewritecode and queryreplace arrays, that will look something like
    1417         //tagname=$matches[i] where i is the current $i
    1418         $queries = array();
    1419         for ( $i = 0; $i < $num_tokens; ++$i ) {
    1420             if ( 0 < $i )
    1421                 $queries[$i] = $queries[$i - 1] . '&';
    1422             else
    1423                 $queries[$i] = '';
    1424 
    1425             $query_token = str_replace($this->rewritecode, $this->queryreplace, $tokens[0][$i]) . $this->preg_index($i+1);
    1426             $queries[$i] .= $query_token;
    1427         }
    1428 
    1429         //get the structure, minus any cruft (stuff that isn't tags) at the front
    1430         $structure = $permalink_structure;
    1431         if ( $front != '/' )
    1432             $structure = str_replace($front, '', $structure);
    1433 
    1434         //create a list of dirs to walk over, making rewrite rules for each level
    1435         //so for example, a $structure of /%year%/%monthnum%/%postname% would create
    1436         //rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
    1437         $structure = trim($structure, '/');
    1438         $dirs = $walk_dirs ? explode('/', $structure) : array( $structure );
    1439         $num_dirs = count($dirs);
    1440 
    1441         //strip slashes from the front of $front
    1442         $front = preg_replace('|^/+|', '', $front);
    1443 
    1444         //the main workhorse loop
    1445         $post_rewrite = array();
    1446         $struct = $front;
    1447         for ( $j = 0; $j < $num_dirs; ++$j ) {
    1448             //get the struct for this dir, and trim slashes off the front
    1449             $struct .= $dirs[$j] . '/'; //accumulate. see comment near explode('/', $structure) above
    1450             $struct = ltrim($struct, '/');
    1451 
    1452             //replace tags with regexes
    1453             $match = str_replace($this->rewritecode, $this->rewritereplace, $struct);
    1454 
    1455             //make a list of tags, and store how many there are in $num_toks
    1456             $num_toks = preg_match_all('/%.+?%/', $struct, $toks);
    1457 
    1458             //get the 'tagname=$matches[i]'
    1459             $query = ( ! empty( $num_toks ) && isset( $queries[$num_toks - 1] ) ) ? $queries[$num_toks - 1] : '';
    1460 
    1461             //set up $ep_mask_specific which is used to match more specific URL types
    1462             switch ( $dirs[$j] ) {
    1463                 case '%year%':
    1464                     $ep_mask_specific = EP_YEAR;
    1465                     break;
    1466                 case '%monthnum%':
    1467                     $ep_mask_specific = EP_MONTH;
    1468                     break;
    1469                 case '%day%':
    1470                     $ep_mask_specific = EP_DAY;
    1471                     break;
    1472                 default:
    1473                     $ep_mask_specific = EP_NONE;
    1474             }
    1475 
    1476             //create query for /page/xx
    1477             $pagematch = $match . $pageregex;
    1478             $pagequery = $index . '?' . $query . '&paged=' . $this->preg_index($num_toks + 1);
    1479 
    1480             //create query for /comment-page-xx
    1481             $commentmatch = $match . $commentregex;
    1482             $commentquery = $index . '?' . $query . '&cpage=' . $this->preg_index($num_toks + 1);
    1483 
    1484             if ( get_option('page_on_front') ) {
    1485                 //create query for Root /comment-page-xx
    1486                 $rootcommentmatch = $match . $commentregex;
    1487                 $rootcommentquery = $index . '?' . $query . '&page_id=' . get_option('page_on_front') . '&cpage=' . $this->preg_index($num_toks + 1);
    1488             }
    1489 
    1490             //create query for /feed/(feed|atom|rss|rss2|rdf)
    1491             $feedmatch = $match . $feedregex;
    1492             $feedquery = $feedindex . '?' . $query . '&feed=' . $this->preg_index($num_toks + 1);
    1493 
    1494             //create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex)
    1495             $feedmatch2 = $match . $feedregex2;
    1496             $feedquery2 = $feedindex . '?' . $query . '&feed=' . $this->preg_index($num_toks + 1);
    1497 
    1498             //if asked to, turn the feed queries into comment feed ones
    1499             if ( $forcomments ) {
    1500                 $feedquery .= '&withcomments=1';
    1501                 $feedquery2 .= '&withcomments=1';
    1502             }
    1503 
    1504             //start creating the array of rewrites for this dir
    1505             $rewrite = array();
    1506             if ( $feed ) //...adding on /feed/ regexes => queries
    1507                 $rewrite = array($feedmatch => $feedquery, $feedmatch2 => $feedquery2);
    1508             if ( $paged ) //...and /page/xx ones
    1509                 $rewrite = array_merge($rewrite, array($pagematch => $pagequery));
    1510 
    1511             //only on pages with comments add ../comment-page-xx/
    1512             if ( EP_PAGES & $ep_mask || EP_PERMALINK & $ep_mask ) {
    1513                 $rewrite = array_merge($rewrite, array($commentmatch => $commentquery));
    1514             } elseif ( EP_ROOT & $ep_mask && get_option('page_on_front') ) {
    1515                 $rewrite = array_merge($rewrite, array($rootcommentmatch => $rootcommentquery));
    1516             }
    1517             //do endpoints
    1518             if ( $endpoints ) {
    1519                 foreach ( (array) $ep_query_append as $regex => $ep) {
    1520                     //add the endpoints on if the mask fits
    1521                     if ( $ep[0] & $ep_mask || $ep[0] & $ep_mask_specific )
    1522                         $rewrite[$match . $regex] = $index . '?' . $query . $ep[1] . $this->preg_index($num_toks + 2);
    1523                 }
    1524             }
    1525 
    1526             //if we've got some tags in this dir
    1527             if ( $num_toks ) {
    1528                 $post = false;
    1529                 $page = false;
    1530 
    1531                 //check to see if this dir is permalink-level: i.e. the structure specifies an
    1532                 //individual post. Do this by checking it contains at least one of 1) post name,
    1533                 //2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
    1534                 //minute all present). Set these flags now as we need them for the endpoints.
    1535                 if ( strpos($struct, '%postname%') !== false
    1536                         || strpos($struct, '%post_id%') !== false
    1537                         || strpos($struct, '%pagename%') !== false
    1538                         || (strpos($struct, '%year%') !== false && strpos($struct, '%monthnum%') !== false && strpos($struct, '%day%') !== false && strpos($struct, '%hour%') !== false && strpos($struct, '%minute%') !== false && strpos($struct, '%second%') !== false)
    1539                         ) {
    1540                     $post = true;
    1541                     if ( strpos($struct, '%pagename%') !== false )
    1542                         $page = true;
    1543                 }
    1544 
    1545                 if ( ! $post ) {
    1546                     // For custom post types, we need to add on endpoints as well.
    1547                     foreach ( get_post_types( array('_builtin' => false ) ) as $ptype ) {
    1548                         if ( strpos($struct, "%$ptype%") !== false ) {
    1549                             $post = true;
    1550                             $page = is_post_type_hierarchical( $ptype ); // This is for page style attachment url's
    1551                             break;
    1552                         }
    1553                     }
    1554                 }
    1555 
    1556                 //if we're creating rules for a permalink, do all the endpoints like attachments etc
    1557                 if ( $post ) {
    1558                     //create query and regex for trackback
    1559                     $trackbackmatch = $match . $trackbackregex;
    1560                     $trackbackquery = $trackbackindex . '?' . $query . '&tb=1';
    1561                     //trim slashes from the end of the regex for this dir
    1562                     $match = rtrim($match, '/');
    1563                     //get rid of brackets
    1564                     $submatchbase = str_replace( array('(', ')'), '', $match);
    1565 
    1566                     //add a rule for at attachments, which take the form of <permalink>/some-text
    1567                     $sub1 = $submatchbase . '/([^/]+)/';
    1568                     $sub1tb = $sub1 . $trackbackregex; //add trackback regex <permalink>/trackback/...
    1569                     $sub1feed = $sub1 . $feedregex; //and <permalink>/feed/(atom|...)
    1570                     $sub1feed2 = $sub1 . $feedregex2; //and <permalink>/(feed|atom...)
    1571                     $sub1comment = $sub1 . $commentregex; //and <permalink>/comment-page-xx
    1572 
    1573                     //add another rule to match attachments in the explicit form:
    1574                     //<permalink>/attachment/some-text
    1575                     $sub2 = $submatchbase . '/attachment/([^/]+)/';
    1576                     $sub2tb = $sub2 . $trackbackregex; //and add trackbacks <permalink>/attachment/trackback
    1577                     $sub2feed = $sub2 . $feedregex;    //feeds, <permalink>/attachment/feed/(atom|...)
    1578                     $sub2feed2 = $sub2 . $feedregex2;  //and feeds again on to this <permalink>/attachment/(feed|atom...)
    1579                     $sub2comment = $sub2 . $commentregex; //and <permalink>/comment-page-xx
    1580 
    1581                     //create queries for these extra tag-ons we've just dealt with
    1582                     $subquery = $index . '?attachment=' . $this->preg_index(1);
    1583                     $subtbquery = $subquery . '&tb=1';
    1584                     $subfeedquery = $subquery . '&feed=' . $this->preg_index(2);
    1585                     $subcommentquery = $subquery . '&cpage=' . $this->preg_index(2);
    1586 
    1587                     //do endpoints for attachments
    1588                     if ( !empty($endpoints) ) {
    1589                         foreach ( (array) $ep_query_append as $regex => $ep ) {
    1590                             if ( $ep[0] & EP_ATTACHMENT ) {
    1591                                 $rewrite[$sub1 . $regex] = $subquery . $ep[1] . $this->preg_index(3);
    1592                                 $rewrite[$sub2 . $regex] = $subquery . $ep[1] . $this->preg_index(3);
    1593                             }
    1594                         }
    1595                     }
    1596 
    1597                     //now we've finished with endpoints, finish off the $sub1 and $sub2 matches
    1598                     //add a ? as we don't have to match that last slash, and finally a $ so we
    1599                     //match to the end of the URL
    1600                     $sub1 .= '?$';
    1601                     $sub2 .= '?$';
    1602 
    1603                     //post pagination, e.g. <permalink>/2/
    1604                     $match = $match . '(/[0-9]+)?/?$';
    1605                     $query = $index . '?' . $query . '&page=' . $this->preg_index($num_toks + 1);
    1606                 } else { //not matching a permalink so this is a lot simpler
    1607                     //close the match and finalise the query
    1608                     $match .= '?$';
    1609                     $query = $index . '?' . $query;
    1610                 }
    1611 
    1612                 //create the final array for this dir by joining the $rewrite array (which currently
    1613                 //only contains rules/queries for trackback, pages etc) to the main regex/query for
    1614                 //this dir
    1615                 $rewrite = array_merge($rewrite, array($match => $query));
    1616 
    1617                 //if we're matching a permalink, add those extras (attachments etc) on
    1618                 if ( $post ) {
    1619                     //add trackback
    1620                     $rewrite = array_merge(array($trackbackmatch => $trackbackquery), $rewrite);
    1621 
    1622                     //add regexes/queries for attachments, attachment trackbacks and so on
    1623                     if ( ! $page ) //require <permalink>/attachment/stuff form for pages because of confusion with subpages
    1624                         $rewrite = array_merge($rewrite, array($sub1 => $subquery, $sub1tb => $subtbquery, $sub1feed => $subfeedquery, $sub1feed2 => $subfeedquery, $sub1comment => $subcommentquery));
    1625                     $rewrite = array_merge(array($sub2 => $subquery, $sub2tb => $subtbquery, $sub2feed => $subfeedquery, $sub2feed2 => $subfeedquery, $sub2comment => $subcommentquery), $rewrite);
    1626                 }
    1627             } //if($num_toks)
    1628             //add the rules for this dir to the accumulating $post_rewrite
    1629             $post_rewrite = array_merge($rewrite, $post_rewrite);
    1630         } //foreach ($dir)
    1631         return $post_rewrite; //the finished rules. phew!
    1632     }
    1633 
    1634     /**
    1635      * Generate Rewrite rules with permalink structure and walking directory only.
    1636      *
    1637      * Shorten version of {@link WP_Rewrite::generate_rewrite_rules()} that
    1638      * allows for shorter list of parameters. See the method for longer
    1639      * description of what generating rewrite rules does.
    1640      *
    1641      * @uses WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
    1642      * @since 1.5.0
    1643      * @access public
    1644      *
    1645      * @param string $permalink_structure The permalink structure to generate rules.
    1646      * @param bool   $walk_dirs           Optional, default is false. Whether to create list of directories to walk over.
    1647      * @return array
    1648      */
    1649     public function generate_rewrite_rule($permalink_structure, $walk_dirs = false) {
    1650         return $this->generate_rewrite_rules($permalink_structure, EP_NONE, false, false, false, $walk_dirs);
    1651     }
    1652 
    1653     /**
    1654      * Construct rewrite matches and queries from permalink structure.
    1655      *
    1656      * Runs the action 'generate_rewrite_rules' with the parameter that is an
    1657      * reference to the current WP_Rewrite instance to further manipulate the
    1658      * permalink structures and rewrite rules. Runs the 'rewrite_rules_array'
    1659      * filter on the full rewrite rule array.
    1660      *
    1661      * There are two ways to manipulate the rewrite rules, one by hooking into
    1662      * the 'generate_rewrite_rules' action and gaining full control of the
    1663      * object or just manipulating the rewrite rule array before it is passed
    1664      * from the function.
    1665      *
    1666      * @since 1.5.0
    1667      * @access public
    1668      *
    1669      * @return array An associate array of matches and queries.
    1670      */
    1671     public function rewrite_rules() {
    1672         $rewrite = array();
    1673 
    1674         if ( empty($this->permalink_structure) )
    1675             return $rewrite;
    1676 
    1677         // robots.txt -only if installed at the root
    1678         $home_path = parse_url( home_url() );
    1679         $robots_rewrite = ( empty( $home_path['path'] ) || '/' == $home_path['path'] ) ? array( 'robots\.txt$' => $this->index . '?robots=1' ) : array();
    1680 
    1681         // Old feed and service files
    1682         $deprecated_files = array(
    1683             '.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
    1684             '.*wp-app\.php(/.*)?$' => $this->index . '?error=403',
    1685         );
    1686 
    1687         // Registration rules
    1688         $registration_pages = array();
    1689         if ( is_multisite() && is_main_site() ) {
    1690             $registration_pages['.*wp-signup.php$'] = $this->index . '?signup=true';
    1691             $registration_pages['.*wp-activate.php$'] = $this->index . '?activate=true';
    1692         }
    1693         $registration_pages['.*wp-register.php$'] = $this->index . '?register=true'; // Deprecated
    1694 
    1695         // Post rewrite rules.
    1696         $post_rewrite = $this->generate_rewrite_rules( $this->permalink_structure, EP_PERMALINK );
    1697 
    1698         /**
    1699          * Filter rewrite rules used for "post" archives.
    1700          *
    1701          * @since 1.5.0
    1702          *
    1703          * @param array $post_rewrite The rewrite rules for posts.
    1704          */
    1705         $post_rewrite = apply_filters( 'post_rewrite_rules', $post_rewrite );
    1706 
    1707         // Date rewrite rules.
    1708         $date_rewrite = $this->generate_rewrite_rules($this->get_date_permastruct(), EP_DATE);
    1709 
    1710         /**
    1711          * Filter rewrite rules used for date archives.
    1712          *
    1713          * Likely date archives would include /yyyy/, /yyyy/mm/, and /yyyy/mm/dd/.
    1714          *
    1715          * @since 1.5.0
    1716          *
    1717          * @param array $date_rewrite The rewrite rules for date archives.
    1718          */
    1719         $date_rewrite = apply_filters( 'date_rewrite_rules', $date_rewrite );
    1720 
    1721         // Root-level rewrite rules.
    1722         $root_rewrite = $this->generate_rewrite_rules($this->root . '/', EP_ROOT);
    1723 
    1724         /**
    1725          * Filter rewrite rules used for root-level archives.
    1726          *
    1727          * Likely root-level archives would include pagination rules for the homepage
    1728          * as well as site-wide post feeds (e.g. /feed/, and /feed/atom/).
    1729          *
    1730          * @since 1.5.0
    1731          *
    1732          * @param array $root_rewrite The root-level rewrite rules.
    1733          */
    1734         $root_rewrite = apply_filters( 'root_rewrite_rules', $root_rewrite );
    1735 
    1736         // Comments rewrite rules.
    1737         $comments_rewrite = $this->generate_rewrite_rules($this->root . $this->comments_base, EP_COMMENTS, false, true, true, false);
    1738 
    1739         /**
    1740          * Filter rewrite rules used for comment feed archives.
    1741          *
    1742          * Likely comments feed archives include /comments/feed/, and /comments/feed/atom/.
    1743          *
    1744          * @since 1.5.0
    1745          *
    1746          * @param array $comments_rewrite The rewrite rules for the site-wide comments feeds.
    1747          */
    1748         $comments_rewrite = apply_filters( 'comments_rewrite_rules', $comments_rewrite );
    1749 
    1750         // Search rewrite rules.
    1751         $search_structure = $this->get_search_permastruct();
    1752         $search_rewrite = $this->generate_rewrite_rules($search_structure, EP_SEARCH);
    1753 
    1754         /**
    1755          * Filter rewrite rules used for search archives.
    1756          *
    1757          * Likely search-related archives include /search/search+query/ as well as
    1758          * pagination and feed paths for a search.
    1759          *
    1760          * @since 1.5.0
    1761          *
    1762          * @param array $search_rewrite The rewrite rules for search queries.
    1763          */
    1764         $search_rewrite = apply_filters( 'search_rewrite_rules', $search_rewrite );
    1765 
    1766         // Author rewrite rules.
    1767         $author_rewrite = $this->generate_rewrite_rules($this->get_author_permastruct(), EP_AUTHORS);
    1768 
    1769         /**
    1770          * Filter rewrite rules used for author archives.
    1771          *
    1772          * Likely author archives would include /author/author-name/, as well as
    1773          * pagination and feed paths for author archives.
    1774          *
    1775          * @since 1.5.0
    1776          *
    1777          * @param array $author_rewrite The rewrite rules for author archives.
    1778          */
    1779         $author_rewrite = apply_filters( 'author_rewrite_rules', $author_rewrite );
    1780 
    1781         // Pages rewrite rules.
    1782         $page_rewrite = $this->page_rewrite_rules();
    1783 
    1784         /**
    1785          * Filter rewrite rules used for "page" post type archives.
    1786          *
    1787          * @since 1.5.0
    1788          *
    1789          * @param array $page_rewrite The rewrite rules for the "page" post type.
    1790          */
    1791         $page_rewrite = apply_filters( 'page_rewrite_rules', $page_rewrite );
    1792 
    1793         // Extra permastructs.
    1794         foreach ( $this->extra_permastructs as $permastructname => $struct ) {
    1795             if ( is_array( $struct ) ) {
    1796                 if ( count( $struct ) == 2 )
    1797                     $rules = $this->generate_rewrite_rules( $struct[0], $struct[1] );
    1798                 else
    1799                     $rules = $this->generate_rewrite_rules( $struct['struct'], $struct['ep_mask'], $struct['paged'], $struct['feed'], $struct['forcomments'], $struct['walk_dirs'], $struct['endpoints'] );
    1800             } else {
    1801                 $rules = $this->generate_rewrite_rules( $struct );
    1802             }
    1803 
    1804             /**
    1805              * Filter rewrite rules used for individual permastructs.
    1806              *
    1807              * The dynamic portion of the hook name, `$permastructname`, refers
    1808              * to the name of the registered permastruct, e.g. 'post_tag' (tags),
    1809              * 'category' (categories), etc.
    1810              *
    1811              * @since 3.1.0
    1812              *
    1813              * @param array $rules The rewrite rules generated for the current permastruct.
    1814              */
    1815             $rules = apply_filters( $permastructname . '_rewrite_rules', $rules );
    1816             if ( 'post_tag' == $permastructname ) {
    1817 
    1818                 /**
    1819                  * Filter rewrite rules used specifically for Tags.
    1820                  *
    1821                  * @since 2.3.0
    1822                  * @deprecated 3.1.0 Use 'post_tag_rewrite_rules' instead
    1823                  *
    1824                  * @param array $rules The rewrite rules generated for tags.
    1825                  */
    1826                 $rules = apply_filters( 'tag_rewrite_rules', $rules );
    1827             }
    1828 
    1829             $this->extra_rules_top = array_merge($this->extra_rules_top, $rules);
    1830         }
    1831 
    1832         // Put them together.
    1833         if ( $this->use_verbose_page_rules )
    1834             $this->rules = array_merge($this->extra_rules_top, $robots_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite,  $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules);
    1835         else
    1836             $this->rules = array_merge($this->extra_rules_top, $robots_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite,  $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules);
    1837 
    1838         /**
    1839          * Fires after the rewrite rules are generated.
    1840          *
    1841          * @since 1.5.0
    1842          *
    1843          * @param WP_Rewrite $this Current WP_Rewrite instance, passed by reference.
    1844          */
    1845         do_action_ref_array( 'generate_rewrite_rules', array( &$this ) );
    1846 
    1847         /**
    1848          * Filter the full set of generated rewrite rules.
    1849          *
    1850          * @since 1.5.0
    1851          *
    1852          * @param array $this->rules The compiled array of rewrite rules.
    1853          */
    1854         $this->rules = apply_filters( 'rewrite_rules_array', $this->rules );
    1855 
    1856         return $this->rules;
    1857     }
    1858 
    1859     /**
    1860      * Retrieve the rewrite rules.
    1861      *
    1862      * The difference between this method and {@link
    1863      * WP_Rewrite::rewrite_rules()} is that this method stores the rewrite rules
    1864      * in the 'rewrite_rules' option and retrieves it. This prevents having to
    1865      * process all of the permalinks to get the rewrite rules in the form of
    1866      * caching.
    1867      *
    1868      * @since 1.5.0
    1869      * @access public
    1870      *
    1871      * @return array Rewrite rules.
    1872      */
    1873     public function wp_rewrite_rules() {
    1874         $this->rules = get_option('rewrite_rules');
    1875         if ( empty($this->rules) ) {
    1876             $this->matches = 'matches';
    1877             $this->rewrite_rules();
    1878             update_option('rewrite_rules', $this->rules);
    1879         }
    1880 
    1881         return $this->rules;
    1882     }
    1883 
    1884     /**
    1885      * Retrieve mod_rewrite formatted rewrite rules to write to .htaccess.
    1886      *
    1887      * Does not actually write to the .htaccess file, but creates the rules for
    1888      * the process that will.
    1889      *
    1890      * Will add the non_wp_rules property rules to the .htaccess file before
    1891      * the WordPress rewrite rules one.
    1892      *
    1893      * @since 1.5.0
    1894      * @access public
    1895      *
    1896      * @return string
    1897      */
    1898     public function mod_rewrite_rules() {
    1899         if ( ! $this->using_permalinks() )
    1900             return '';
    1901 
    1902         $site_root = parse_url( site_url() );
    1903         if ( isset( $site_root['path'] ) )
    1904             $site_root = trailingslashit($site_root['path']);
    1905 
    1906         $home_root = parse_url(home_url());
    1907         if ( isset( $home_root['path'] ) )
    1908             $home_root = trailingslashit($home_root['path']);
    1909         else
    1910             $home_root = '/';
    1911 
    1912         $rules = "<IfModule mod_rewrite.c>\n";
    1913         $rules .= "RewriteEngine On\n";
    1914         $rules .= "RewriteBase $home_root\n";
    1915         $rules .= "RewriteRule ^index\.php$ - [L]\n"; // Prevent -f checks on index.php.
    1916 
    1917         //add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all)
    1918         foreach ( (array) $this->non_wp_rules as $match => $query) {
    1919             // Apache 1.3 does not support the reluctant (non-greedy) modifier.
    1920             $match = str_replace('.+?', '.+', $match);
    1921 
    1922             // If the match is unanchored and greedy, prepend rewrite conditions
    1923             // to avoid infinite redirects and eclipsing of real files.
    1924             //if ($match == '(.+)/?$' || $match == '([^/]+)/?$' ) {
    1925                 //nada.
    1926             //}
    1927 
    1928             $rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
    1929         }
    1930 
    1931         if ( $this->use_verbose_rules ) {
    1932             $this->matches = '';
    1933             $rewrite = $this->rewrite_rules();
    1934             $num_rules = count($rewrite);
    1935             $rules .= "RewriteCond %{REQUEST_FILENAME} -f [OR]\n" .
    1936                 "RewriteCond %{REQUEST_FILENAME} -d\n" .
    1937                 "RewriteRule ^.*$ - [S=$num_rules]\n";
    1938 
    1939             foreach ( (array) $rewrite as $match => $query) {
    1940                 // Apache 1.3 does not support the reluctant (non-greedy) modifier.
    1941                 $match = str_replace('.+?', '.+', $match);
    1942 
    1943                 // If the match is unanchored and greedy, prepend rewrite conditions
    1944                 // to avoid infinite redirects and eclipsing of real files.
    1945                 //if ($match == '(.+)/?$' || $match == '([^/]+)/?$' ) {
    1946                     //nada.
    1947                 //}
    1948 
    1949                 if ( strpos($query, $this->index) !== false )
    1950                     $rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
    1951                 else
    1952                     $rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA,L]\n";
    1953             }
    1954         } else {
    1955             $rules .= "RewriteCond %{REQUEST_FILENAME} !-f\n" .
    1956                 "RewriteCond %{REQUEST_FILENAME} !-d\n" .
    1957                 "RewriteRule . {$home_root}{$this->index} [L]\n";
    1958         }
    1959 
    1960         $rules .= "</IfModule>\n";
    1961 
    1962         /**
    1963          *
    1964          * Filter the list of rewrite rules formatted for output to an .htaccess file.
    1965          *
    1966          * @since 1.5.0
    1967          *
    1968          * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
    1969          */
    1970         $rules = apply_filters( 'mod_rewrite_rules', $rules );
    1971 
    1972         /**
    1973          * Filter the list of rewrite rules formatted for output to an .htaccess file.
    1974          *
    1975          * @since 1.5.0
    1976          * @deprecated 1.5.0 Use the mod_rewrite_rules filter instead.
    1977          *
    1978          * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
    1979          */
    1980         return apply_filters( 'rewrite_rules', $rules );
    1981     }
    1982 
    1983     /**
    1984      * Retrieve IIS7 URL Rewrite formatted rewrite rules to write to web.config file.
    1985      *
    1986      * Does not actually write to the web.config file, but creates the rules for
    1987      * the process that will.
    1988      *
    1989      * @since 2.8.0
    1990      * @access public
    1991      *
    1992      * @return string
    1993      */
    1994     public function iis7_url_rewrite_rules( $add_parent_tags = false ) {
    1995         if ( ! $this->using_permalinks() )
    1996             return '';
    1997         $rules = '';
    1998         if ( $add_parent_tags ) {
    1999             $rules .= '<configuration>
    2000     <system.webServer>
    2001         <rewrite>
    2002             <rules>';
    2003         }
    2004 
    2005         $rules .= '
    2006             <rule name="wordpress" patternSyntax="Wildcard">
    2007                 <match url="*" />
    2008                     <conditions>
    2009                         <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
    2010                         <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
    2011                     </conditions>
    2012                 <action type="Rewrite" url="index.php" />
    2013             </rule>';
    2014 
    2015         if ( $add_parent_tags ) {
    2016             $rules .= '
    2017             </rules>
    2018         </rewrite>
    2019     </system.webServer>
    2020 </configuration>';
    2021         }
    2022 
    2023         /**
    2024          * Filter the list of rewrite rules formatted for output to a web.config.
    2025          *
    2026          * @since 2.8.0
    2027          *
    2028          * @param string $rules Rewrite rules formatted for IIS web.config.
    2029          */
    2030         return apply_filters( 'iis7_url_rewrite_rules', $rules );
    2031     }
    2032 
    2033     /**
    2034      * Add a straight rewrite rule.
    2035      *
    2036      * Any value in the $after parameter that isn't 'bottom' will be placed at
    2037      * the top of the rules.
    2038      *
    2039      * @since 2.1.0
    2040      * @access public
    2041      *
    2042      * @param string $regex    Regular expression to match against request.
    2043      * @param string $redirect URL regex redirects to when regex matches request.
    2044      * @param string $after    Optional, default is bottom. Location to place rule.
    2045      */
    2046     public function add_rule($regex, $redirect, $after = 'bottom') {
    2047         //get everything up to the first ?
    2048         $index = (strpos($redirect, '?') === false ? strlen($redirect) : strpos($redirect, '?'));
    2049         $front = substr($redirect, 0, $index);
    2050         if ( $front != $this->index ) { //it doesn't redirect to WP's index.php
    2051             $this->add_external_rule($regex, $redirect);
    2052         } else {
    2053             if ( 'bottom' == $after)
    2054                 $this->extra_rules = array_merge($this->extra_rules, array($regex => $redirect));
    2055             else
    2056                 $this->extra_rules_top = array_merge($this->extra_rules_top, array($regex => $redirect));
    2057             //$this->extra_rules[$regex] = $redirect;
    2058         }
    2059     }
    2060 
    2061     /**
    2062      * Add a rule that doesn't redirect to index.php.
    2063      *
    2064      * Can redirect to any place.
    2065      *
    2066      * @since 2.1.0
    2067      * @access public
    2068      *
    2069      * @param string $regex    Regular expression to match against request.
    2070      * @param string $redirect URL regex redirects to when regex matches request.
    2071      */
    2072     public function add_external_rule($regex, $redirect) {
    2073         $this->non_wp_rules[$regex] = $redirect;
    2074     }
    2075 
    2076     /**
    2077      * Add an endpoint, like /trackback/.
    2078      *
    2079      * @since 2.1.0
    2080      * @since 3.9.0 $query_var parameter added.
    2081      * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
    2082      * @access public
    2083      *
    2084      * @see add_rewrite_endpoint() for full documentation.
    2085      *
    2086      * @global WP $wp
    2087      *
    2088      * @param string      $name      Name of the endpoint.
    2089      * @param int         $places    Endpoint mask describing the places the endpoint should be added.
    2090      * @param string|bool $query_var Optional. Name of the corresponding query variable. Pass `false` to
    2091      *                               skip registering a query_var for this endpoint. Defaults to the
    2092      *                               value of `$name`.
    2093      */
    2094     public function add_endpoint( $name, $places, $query_var = true ) {
    2095         global $wp;
    2096 
    2097         // For backward compatibility, if `null` has explicitly been passed as `$query_var`, assume `true`.
    2098         if ( true === $query_var || null === func_get_arg( 2 ) ) {
    2099             $query_var = $name;
    2100         }
    2101         $this->endpoints[] = array( $places, $name, $query_var );
    2102 
    2103         if ( $query_var ) {
    2104             $wp->add_query_var( $query_var );
    2105         }
    2106     }
    2107 
    2108     /**
    2109      * Add a new permalink structure.
    2110      *
    2111      * A permalink structure (permastruct) is an abstract definition of a set of rewrite rules; it
    2112      * is an easy way of expressing a set of regular expressions that rewrite to a set of query strings.
    2113      * The new permastruct is added to the {@link WP_Rewrite::$extra_permastructs} array. When the
    2114      * rewrite rules are built by {@link WP_Rewrite::rewrite_rules()} all of these extra permastructs
    2115      * are passed to {@link WP_Rewrite::generate_rewrite_rules()} which transforms them into the
    2116      * regular expressions that many love to hate.
    2117      *
    2118      * The $args parameter gives you control over how {@link WP_Rewrite::generate_rewrite_rules()}
    2119      * works on the new permastruct.
    2120      *
    2121      * @since 2.5.0
    2122      * @access public
    2123      *
    2124      * @param string $name   Name for permalink structure.
    2125      * @param string $struct Permalink structure (e.g. category/%category%)
    2126      * @param array  $args   Optional configuration for building the rules from the permalink structure:
    2127      *     - with_front (bool) - Should the structure be prepended with WP_Rewrite::$front? Default is true.
    2128      *     - ep_mask (int) - Endpoint mask defining what endpoints are added to the structure. Default is EP_NONE.
    2129      *     - paged (bool) - Should archive pagination rules be added for the structure? Default is true.
    2130      *     - feed (bool) - Should feed rewrite rules be added for the structure? Default is true.
    2131      *     - forcomments (bool) - Should the feed rules be a query for a comments feed? Default is false.
    2132      *     - walk_dirs (bool) - Should the 'directories' making up the structure be walked over and rewrite
    2133      *                          rules built for each in turn? Default is true.
    2134      *     - endpoints (bool) - Should endpoints be applied to the generated rewrite rules? Default is true.
    2135      */
    2136     public function add_permastruct( $name, $struct, $args = array() ) {
    2137         // backwards compatibility for the old parameters: $with_front and $ep_mask
    2138         if ( ! is_array( $args ) )
    2139             $args = array( 'with_front' => $args );
    2140         if ( func_num_args() == 4 )
    2141             $args['ep_mask'] = func_get_arg( 3 );
    2142 
    2143         $defaults = array(
    2144             'with_front' => true,
    2145             'ep_mask' => EP_NONE,
    2146             'paged' => true,
    2147             'feed' => true,
    2148             'forcomments' => false,
    2149             'walk_dirs' => true,
    2150             'endpoints' => true,
    2151         );
    2152         $args = array_intersect_key( $args, $defaults );
    2153         $args = wp_parse_args( $args, $defaults );
    2154 
    2155         if ( $args['with_front'] )
    2156             $struct = $this->front . $struct;
    2157         else
    2158             $struct = $this->root . $struct;
    2159         $args['struct'] = $struct;
    2160 
    2161         $this->extra_permastructs[ $name ] = $args;
    2162     }
    2163 
    2164     /**
    2165      * Remove rewrite rules and then recreate rewrite rules.
    2166      *
    2167      * Calls {@link WP_Rewrite::wp_rewrite_rules()} after removing the
    2168      * 'rewrite_rules' option. If the function named 'save_mod_rewrite_rules'
    2169      * exists, it will be called.
    2170      *
    2171      * @since 2.0.1
    2172      * @access public
    2173      *
    2174      * @staticvar bool $do_hard_later
    2175      *
    2176      * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
    2177      */
    2178     public function flush_rules( $hard = true ) {
    2179         static $do_hard_later = null;
    2180 
    2181         // Prevent this action from running before everyone has registered their rewrites
    2182         if ( ! did_action( 'wp_loaded' ) ) {
    2183             add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
    2184             $do_hard_later = ( isset( $do_hard_later ) ) ? $do_hard_later || $hard : $hard;
    2185             return;
    2186         }
    2187 
    2188         if ( isset( $do_hard_later ) ) {
    2189             $hard = $do_hard_later;
    2190             unset( $do_hard_later );
    2191         }
    2192 
    2193         delete_option('rewrite_rules');
    2194         $this->wp_rewrite_rules();
    2195         /**
    2196          * Filter whether a "hard" rewrite rule flush should be performed when requested.
    2197          *
    2198          * A "hard" flush updates .htaccess (Apache) or web.config (IIS).
    2199          *
    2200          * @since 3.7.0
    2201          *
    2202          * @param bool $hard Whether to flush rewrite rules "hard". Default true.
    2203          */
    2204         if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) ) {
    2205             return;
    2206         }
    2207         if ( function_exists( 'save_mod_rewrite_rules' ) )
    2208             save_mod_rewrite_rules();
    2209         if ( function_exists( 'iis7_save_url_rewrite_rules' ) )
    2210             iis7_save_url_rewrite_rules();
    2211     }
    2212 
    2213     /**
    2214      * Sets up the object's properties.
    2215      *
    2216      * The 'use_verbose_page_rules' object property will be set to true if the
    2217      * permalink structure begins with one of the following: '%postname%', '%category%',
    2218      * '%tag%', or '%author%'.
    2219      *
    2220      * @since 1.5.0
    2221      * @access public
    2222      */
    2223     public function init() {
    2224         $this->extra_rules = $this->non_wp_rules = $this->endpoints = array();
    2225         $this->permalink_structure = get_option('permalink_structure');
    2226         $this->front = substr($this->permalink_structure, 0, strpos($this->permalink_structure, '%'));
    2227         $this->root = '';
    2228         if ( $this->using_index_permalinks() )
    2229             $this->root = $this->index . '/';
    2230         unset($this->author_structure);
    2231         unset($this->date_structure);
    2232         unset($this->page_structure);
    2233         unset($this->search_structure);
    2234         unset($this->feed_structure);
    2235         unset($this->comment_feed_structure);
    2236         $this->use_trailing_slashes = ( '/' == substr($this->permalink_structure, -1, 1) );
    2237 
    2238         // Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
    2239         if ( preg_match("/^[^%]*%(?:postname|category|tag|author)%/", $this->permalink_structure) )
    2240              $this->use_verbose_page_rules = true;
    2241         else
    2242             $this->use_verbose_page_rules = false;
    2243     }
    2244 
    2245     /**
    2246      * Set the main permalink structure for the blog.
    2247      *
    2248      * Will update the 'permalink_structure' option, if there is a difference
    2249      * between the current permalink structure and the parameter value. Calls
    2250      * {@link WP_Rewrite::init()} after the option is updated.
    2251      *
    2252      * Fires the 'permalink_structure_changed' action once the init call has
    2253      * processed passing the old and new values
    2254      *
    2255      * @since 1.5.0
    2256      * @access public
    2257      *
    2258      * @param string $permalink_structure Permalink structure.
    2259      */
    2260     public function set_permalink_structure($permalink_structure) {
    2261         if ( $permalink_structure != $this->permalink_structure ) {
    2262             $old_permalink_structure = $this->permalink_structure;
    2263             update_option('permalink_structure', $permalink_structure);
    2264             $this->init();
    2265 
    2266             /**
    2267              * Fires after the permalink structure is updated.
    2268              *
    2269              * @since 2.8.0
    2270              *
    2271              * @param string $old_permalink_structure The previous permalink structure.
    2272              * @param string $permalink_structure     The new permalink structure.
    2273              */
    2274             do_action( 'permalink_structure_changed', $old_permalink_structure, $permalink_structure );
    2275         }
    2276     }
    2277 
    2278     /**
    2279      * Set the category base for the category permalink.
    2280      *
    2281      * Will update the 'category_base' option, if there is a difference between
    2282      * the current category base and the parameter value. Calls
    2283      * {@link WP_Rewrite::init()} after the option is updated.
    2284      *
    2285      * @since 1.5.0
    2286      * @access public
    2287      *
    2288      * @param string $category_base Category permalink structure base.
    2289      */
    2290     public function set_category_base($category_base) {
    2291         if ( $category_base != get_option('category_base') ) {
    2292             update_option('category_base', $category_base);
    2293             $this->init();
    2294         }
    2295     }
    2296 
    2297     /**
    2298      * Set the tag base for the tag permalink.
    2299      *
    2300      * Will update the 'tag_base' option, if there is a difference between the
    2301      * current tag base and the parameter value. Calls
    2302      * {@link WP_Rewrite::init()} after the option is updated.
    2303      *
    2304      * @since 2.3.0
    2305      * @access public
    2306      *
    2307      * @param string $tag_base Tag permalink structure base.
    2308      */
    2309     public function set_tag_base( $tag_base ) {
    2310         if ( $tag_base != get_option( 'tag_base') ) {
    2311             update_option( 'tag_base', $tag_base );
    2312             $this->init();
    2313         }
    2314     }
    2315 
    2316     /**
    2317      * Constructor - Calls init(), which runs setup.
    2318      *
    2319      * @since 1.5.0
    2320      * @access public
    2321      *
    2322      */
    2323     public function __construct() {
    2324         $this->init();
    2325     }
    2326 }
  • trunk/src/wp-includes/rewrite.php

    r33237 r33751  
    77 */
    88
    9 /**
    10  * Add a straight rewrite rule.
    11  *
    12  * @since 2.1.0
    13  *
    14  * @global WP_Rewrite $wp_rewrite
    15  *
    16  * @param string $regex    Regular Expression to match request against.
    17  * @param string $redirect Page to redirect to.
    18  * @param string $after    Optional, default is 'bottom'. Where to add rule, can also be 'top'.
    19  */
    20 function add_rewrite_rule($regex, $redirect, $after = 'bottom') {
    21     global $wp_rewrite;
    22     $wp_rewrite->add_rule($regex, $redirect, $after);
    23 }
    24 
    25 /**
    26  * Add a new rewrite tag (like %postname%).
    27  *
    28  * The $query parameter is optional. If it is omitted you must ensure that
    29  * you call this on, or before, the 'init' hook. This is because $query defaults
    30  * to "$tag=", and for this to work a new query var has to be added.
    31  *
    32  * @since 2.1.0
    33  *
    34  * @global WP_Rewrite $wp_rewrite
    35  * @global WP         $wp
    36  *
    37  * @param string $tag   Name of the new rewrite tag.
    38  * @param string $regex Regular expression to substitute the tag for in rewrite rules.
    39  * @param string $query String to append to the rewritten query. Must end in '='. Optional.
    40  */
    41 function add_rewrite_tag( $tag, $regex, $query = '' ) {
    42     // validate the tag's name
    43     if ( strlen( $tag ) < 3 || $tag[0] != '%' || $tag[ strlen($tag) - 1 ] != '%' )
    44         return;
    45 
    46     global $wp_rewrite, $wp;
    47 
    48     if ( empty( $query ) ) {
    49         $qv = trim( $tag, '%' );
    50         $wp->add_query_var( $qv );
    51         $query = $qv . '=';
    52     }
    53 
    54     $wp_rewrite->add_rewrite_tag( $tag, $regex, $query );
    55 }
    56 
    57 /**
    58  * Add permalink structure.
    59  *
    60  * @since 3.0.0
    61  *
    62  * @global WP_Rewrite $wp_rewrite
    63  *
    64  * @param string $name   Name for permalink structure.
    65  * @param string $struct Permalink structure.
    66  * @param array  $args   Optional configuration for building the rules from the permalink structure,
    67  *                       see {@link WP_Rewrite::add_permastruct()} for full details.
    68  */
    69 function add_permastruct( $name, $struct, $args = array() ) {
    70     global $wp_rewrite;
    71 
    72     // backwards compatibility for the old parameters: $with_front and $ep_mask
    73     if ( ! is_array( $args ) )
    74         $args = array( 'with_front' => $args );
    75     if ( func_num_args() == 4 )
    76         $args['ep_mask'] = func_get_arg( 3 );
    77 
    78     $wp_rewrite->add_permastruct( $name, $struct, $args );
    79 }
    80 
    81 /**
    82  * Add a new feed type like /atom1/.
    83  *
    84  * @since 2.1.0
    85  *
    86  * @global WP_Rewrite $wp_rewrite
    87  *
    88  * @param string   $feedname
    89  * @param callback $function Callback to run on feed display.
    90  * @return string Feed action name.
    91  */
    92 function add_feed($feedname, $function) {
    93     global $wp_rewrite;
    94     if ( ! in_array($feedname, $wp_rewrite->feeds) ) //override the file if it is
    95         $wp_rewrite->feeds[] = $feedname;
    96     $hook = 'do_feed_' . $feedname;
    97     // Remove default function hook
    98     remove_action($hook, $hook);
    99     add_action($hook, $function, 10, 1);
    100     return $hook;
    101 }
    102 
    103 /**
    104  * Remove rewrite rules and then recreate rewrite rules.
    105  *
    106  * @since 3.0.0
    107  *
    108  * @global WP_Rewrite $wp_rewrite
    109  *
    110  * @param bool $hard Whether to update .htaccess (hard flush) or just update
    111  *                   rewrite_rules transient (soft flush). Default is true (hard).
    112  */
    113 function flush_rewrite_rules( $hard = true ) {
    114     global $wp_rewrite;
    115     $wp_rewrite->flush_rules( $hard );
    116 }
    117 
    118 /**
    119  * Endpoint Mask for default, which is nothing.
    120  *
    121  * @since 2.1.0
    122  */
    123 define('EP_NONE', 0);
    124 
    125 /**
    126  * Endpoint Mask for Permalink.
    127  *
    128  * @since 2.1.0
    129  */
    130 define('EP_PERMALINK', 1);
    131 
    132 /**
    133  * Endpoint Mask for Attachment.
    134  *
    135  * @since 2.1.0
    136  */
    137 define('EP_ATTACHMENT', 2);
    138 
    139 /**
    140  * Endpoint Mask for date.
    141  *
    142  * @since 2.1.0
    143  */
    144 define('EP_DATE', 4);
    145 
    146 /**
    147  * Endpoint Mask for year
    148  *
    149  * @since 2.1.0
    150  */
    151 define('EP_YEAR', 8);
    152 
    153 /**
    154  * Endpoint Mask for month.
    155  *
    156  * @since 2.1.0
    157  */
    158 define('EP_MONTH', 16);
    159 
    160 /**
    161  * Endpoint Mask for day.
    162  *
    163  * @since 2.1.0
    164  */
    165 define('EP_DAY', 32);
    166 
    167 /**
    168  * Endpoint Mask for root.
    169  *
    170  * @since 2.1.0
    171  */
    172 define('EP_ROOT', 64);
    173 
    174 /**
    175  * Endpoint Mask for comments.
    176  *
    177  * @since 2.1.0
    178  */
    179 define('EP_COMMENTS', 128);
    180 
    181 /**
    182  * Endpoint Mask for searches.
    183  *
    184  * @since 2.1.0
    185  */
    186 define('EP_SEARCH', 256);
    187 
    188 /**
    189  * Endpoint Mask for categories.
    190  *
    191  * @since 2.1.0
    192  */
    193 define('EP_CATEGORIES', 512);
    194 
    195 /**
    196  * Endpoint Mask for tags.
    197  *
    198  * @since 2.3.0
    199  */
    200 define('EP_TAGS', 1024);
    201 
    202 /**
    203  * Endpoint Mask for authors.
    204  *
    205  * @since 2.1.0
    206  */
    207 define('EP_AUTHORS', 2048);
    208 
    209 /**
    210  * Endpoint Mask for pages.
    211  *
    212  * @since 2.1.0
    213  */
    214 define('EP_PAGES', 4096);
    215 
    216 /**
    217  * Endpoint Mask for all archive views.
    218  *
    219  * @since 3.7.0
    220  */
    221 define( 'EP_ALL_ARCHIVES', EP_DATE | EP_YEAR | EP_MONTH | EP_DAY | EP_CATEGORIES | EP_TAGS | EP_AUTHORS );
    222 
    223 /**
    224  * Endpoint Mask for everything.
    225  *
    226  * @since 2.1.0
    227  */
    228 define( 'EP_ALL', EP_PERMALINK | EP_ATTACHMENT | EP_ROOT | EP_COMMENTS | EP_SEARCH | EP_PAGES | EP_ALL_ARCHIVES );
    229 
    230 /**
    231  * Add an endpoint, like /trackback/.
    232  *
    233  * Adding an endpoint creates extra rewrite rules for each of the matching
    234  * places specified by the provided bitmask. For example:
    235  *
    236  *     add_rewrite_endpoint( 'json', EP_PERMALINK | EP_PAGES );
    237  *
    238  * will add a new rewrite rule ending with "json(/(.*))?/?$" for every permastruct
    239  * that describes a permalink (post) or page. This is rewritten to "json=$match"
    240  * where $match is the part of the URL matched by the endpoint regex (e.g. "foo" in
    241  * "[permalink]/json/foo/").
    242  *
    243  * A new query var with the same name as the endpoint will also be created.
    244  *
    245  * When specifying $places ensure that you are using the EP_* constants (or a
    246  * combination of them using the bitwise OR operator) as their values are not
    247  * guaranteed to remain static (especially `EP_ALL`).
    248  *
    249  * Be sure to flush the rewrite rules - see flush_rewrite_rules() - when your plugin gets
    250  * activated and deactivated.
    251  *
    252  * @since 2.1.0
    253  * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
    254  *
    255  * @global WP_Rewrite $wp_rewrite
    256  *
    257  * @param string      $name      Name of the endpoint.
    258  * @param int         $places    Endpoint mask describing the places the endpoint should be added.
    259  * @param string|bool $query_var Name of the corresponding query variable. Pass `false` to skip registering a query_var
    260  *                               for this endpoint. Defaults to the value of `$name`.
    261  */
    262 function add_rewrite_endpoint( $name, $places, $query_var = true ) {
    263     global $wp_rewrite;
    264     $wp_rewrite->add_endpoint( $name, $places, $query_var );
    265 }
    266 
    267 /**
    268  * Filter the URL base for taxonomies.
    269  *
    270  * To remove any manually prepended /index.php/.
    271  *
    272  * @access private
    273  * @since 2.6.0
    274  *
    275  * @param string $base The taxonomy base that we're going to filter
    276  * @return string
    277  */
    278 function _wp_filter_taxonomy_base( $base ) {
    279     if ( !empty( $base ) ) {
    280         $base = preg_replace( '|^/index\.php/|', '', $base );
    281         $base = trim( $base, '/' );
    282     }
    283     return $base;
    284 }
    285 
    286 
    287 /**
    288  * Resolve numeric slugs that collide with date permalinks.
    289  *
    290  * Permalinks of posts with numeric slugs can sometimes look to WP_Query::parse_query()
    291  * like a date archive, as when your permalink structure is `/%year%/%postname%/` and
    292  * a post with post_name '05' has the URL `/2015/05/`.
    293  *
    294  * This function detects conflicts of this type and resolves them in favor of the
    295  * post permalink.
    296  *
    297  * Note that, since 4.3.0, wp_unique_post_slug() prevents the creation of post slugs
    298  * that would result in a date archive conflict. The resolution performed in this
    299  * function is primarily for legacy content, as well as cases when the admin has changed
    300  * the site's permalink structure in a way that introduces URL conflicts.
    301  *
    302  * @since 4.3.0
    303  *
    304  * @param array $query_vars Optional. Query variables for setting up the loop, as determined in
    305  *                          WP::parse_request(). Default empty array.
    306  * @return array Returns the original array of query vars, with date/post conflicts resolved.
    307  */
    308 function wp_resolve_numeric_slug_conflicts( $query_vars = array() ) {
    309     if ( ! isset( $query_vars['year'] ) && ! isset( $query_vars['monthnum'] ) && ! isset( $query_vars['day'] ) ) {
    310         return $query_vars;
    311     }
    312 
    313     // Identify the 'postname' position in the permastruct array.
    314     $permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
    315     $postname_index = array_search( '%postname%', $permastructs );
    316 
    317     if ( false === $postname_index ) {
    318         return $query_vars;
    319     }
    320 
    321     /*
    322      * A numeric slug could be confused with a year, month, or day, depending on position. To account for
    323      * the possibility of post pagination (eg 2015/2 for the second page of a post called '2015'), our
    324      * `is_*` checks are generous: check for year-slug clashes when `is_year` *or* `is_month`, and check
    325      * for month-slug clashes when `is_month` *or* `is_day`.
    326      */
    327     $compare = '';
    328     if ( 0 === $postname_index && ( isset( $query_vars['year'] ) || isset( $query_vars['monthnum'] ) ) ) {
    329         $compare = 'year';
    330     } elseif ( '%year%' === $permastructs[ $postname_index - 1 ] && ( isset( $query_vars['monthnum'] ) || isset( $query_vars['day'] ) ) ) {
    331         $compare = 'monthnum';
    332     } elseif ( '%monthnum%' === $permastructs[ $postname_index - 1 ] && isset( $query_vars['day'] ) ) {
    333         $compare = 'day';
    334     }
    335 
    336     if ( ! $compare ) {
    337         return $query_vars;
    338     }
    339 
    340     // This is the potentially clashing slug.
    341     $value = $query_vars[ $compare ];
    342 
    343     $post = get_page_by_path( $value, OBJECT, 'post' );
    344     if ( ! ( $post instanceof WP_Post ) ) {
    345         return $query_vars;
    346     }
    347 
    348     // If the date of the post doesn't match the date specified in the URL, resolve to the date archive.
    349     if ( preg_match( '/^([0-9]{4})\-([0-9]{2})/', $post->post_date, $matches ) && isset( $query_vars['year'] ) && ( 'monthnum' === $compare || 'day' === $compare ) ) {
    350         // $matches[1] is the year the post was published.
    351         if ( intval( $query_vars['year'] ) !== intval( $matches[1] ) ) {
    352             return $query_vars;
    353         }
    354 
    355         // $matches[2] is the month the post was published.
    356         if ( 'day' === $compare && isset( $query_vars['monthnum'] ) && intval( $query_vars['monthnum'] ) !== intval( $matches[2] ) ) {
    357             return $query_vars;
    358         }
    359     }
    360 
    361     /*
    362      * If the located post contains nextpage pagination, then the URL chunk following postname may be
    363      * intended as the page number. Verify that it's a valid page before resolving to it.
    364      */
    365     $maybe_page = '';
    366     if ( 'year' === $compare && isset( $query_vars['monthnum'] ) ) {
    367         $maybe_page = $query_vars['monthnum'];
    368     } elseif ( 'monthnum' === $compare && isset( $query_vars['day'] ) ) {
    369         $maybe_page = $query_vars['day'];
    370     }
    371 
    372     $post_page_count = substr_count( $post->post_content, '<!--nextpage-->' ) + 1;
    373 
    374     // If the post doesn't have multiple pages, but a 'page' candidate is found, resolve to the date archive.
    375     if ( 1 === $post_page_count && $maybe_page ) {
    376         return $query_vars;
    377     }
    378 
    379     // If the post has multiple pages and the 'page' number isn't valid, resolve to the date archive.
    380     if ( $post_page_count > 1 && $maybe_page > $post_page_count ) {
    381         return $query_vars;
    382     }
    383 
    384     // If we've gotten to this point, we have a slug/date clash. First, adjust for nextpage.
    385     if ( '' !== $maybe_page ) {
    386         $query_vars['page'] = intval( $maybe_page );
    387     }
    388 
    389     // Next, unset autodetected date-related query vars.
    390     unset( $query_vars['year'] );
    391     unset( $query_vars['monthnum'] );
    392     unset( $query_vars['day'] );
    393 
    394     // Then, set the identified post.
    395     $query_vars['name'] = $post->post_name;
    396 
    397     // Finally, return the modified query vars.
    398     return $query_vars;
    399 }
    400 
    401 /**
    402  * Examine a url and try to determine the post ID it represents.
    403  *
    404  * Checks are supposedly from the hosted site blog.
    405  *
    406  * @since 1.0.0
    407  *
    408  * @global WP_Rewrite $wp_rewrite
    409  * @global WP         $wp
    410  *
    411  * @param string $url Permalink to check.
    412  * @return int Post ID, or 0 on failure.
    413  */
    414 function url_to_postid( $url ) {
    415     global $wp_rewrite;
    416 
    417     /**
    418      * Filter the URL to derive the post ID from.
    419      *
    420      * @since 2.2.0
    421      *
    422      * @param string $url The URL to derive the post ID from.
    423      */
    424     $url = apply_filters( 'url_to_postid', $url );
    425 
    426     // First, check to see if there is a 'p=N' or 'page_id=N' to match against
    427     if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) )   {
    428         $id = absint($values[2]);
    429         if ( $id )
    430             return $id;
    431     }
    432 
    433     // Check to see if we are using rewrite rules
    434     $rewrite = $wp_rewrite->wp_rewrite_rules();
    435 
    436     // Not using rewrite rules, and 'p=N' and 'page_id=N' methods failed, so we're out of options
    437     if ( empty($rewrite) )
    438         return 0;
    439 
    440     // Get rid of the #anchor
    441     $url_split = explode('#', $url);
    442     $url = $url_split[0];
    443 
    444     // Get rid of URL ?query=string
    445     $url_split = explode('?', $url);
    446     $url = $url_split[0];
    447 
    448     // Add 'www.' if it is absent and should be there
    449     if ( false !== strpos(home_url(), '://www.') && false === strpos($url, '://www.') )
    450         $url = str_replace('://', '://www.', $url);
    451 
    452     // Strip 'www.' if it is present and shouldn't be
    453     if ( false === strpos(home_url(), '://www.') )
    454         $url = str_replace('://www.', '://', $url);
    455 
    456     // Strip 'index.php/' if we're not using path info permalinks
    457     if ( !$wp_rewrite->using_index_permalinks() )
    458         $url = str_replace( $wp_rewrite->index . '/', '', $url );
    459 
    460     if ( false !== strpos( trailingslashit( $url ), home_url( '/' ) ) ) {
    461         // Chop off http://domain.com/[path]
    462         $url = str_replace(home_url(), '', $url);
    463     } else {
    464         // Chop off /path/to/blog
    465         $home_path = parse_url( home_url( '/' ) );
    466         $home_path = isset( $home_path['path'] ) ? $home_path['path'] : '' ;
    467         $url = preg_replace( sprintf( '#^%s#', preg_quote( $home_path ) ), '', trailingslashit( $url ) );
    468     }
    469 
    470     // Trim leading and lagging slashes
    471     $url = trim($url, '/');
    472 
    473     $request = $url;
    474     $post_type_query_vars = array();
    475 
    476     foreach ( get_post_types( array() , 'objects' ) as $post_type => $t ) {
    477         if ( ! empty( $t->query_var ) )
    478             $post_type_query_vars[ $t->query_var ] = $post_type;
    479     }
    480 
    481     // Look for matches.
    482     $request_match = $request;
    483     foreach ( (array)$rewrite as $match => $query) {
    484 
    485         // If the requesting file is the anchor of the match, prepend it
    486         // to the path info.
    487         if ( !empty($url) && ($url != $request) && (strpos($match, $url) === 0) )
    488             $request_match = $url . '/' . $request;
    489 
    490         if ( preg_match("#^$match#", $request_match, $matches) ) {
    491 
    492             if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {
    493                 // This is a verbose page match, let's check to be sure about it.
    494                 if ( ! get_page_by_path( $matches[ $varmatch[1] ] ) )
    495                     continue;
    496             }
    497 
    498             // Got a match.
    499             // Trim the query of everything up to the '?'.
    500             $query = preg_replace("!^.+\?!", '', $query);
    501 
    502             // Substitute the substring matches into the query.
    503             $query = addslashes(WP_MatchesMapRegex::apply($query, $matches));
    504 
    505             // Filter out non-public query vars
    506             global $wp;
    507             parse_str( $query, $query_vars );
    508             $query = array();
    509             foreach ( (array) $query_vars as $key => $value ) {
    510                 if ( in_array( $key, $wp->public_query_vars ) ){
    511                     $query[$key] = $value;
    512                     if ( isset( $post_type_query_vars[$key] ) ) {
    513                         $query['post_type'] = $post_type_query_vars[$key];
    514                         $query['name'] = $value;
    515                     }
    516                 }
    517             }
    518 
    519             // Resolve conflicts between posts with numeric slugs and date archive queries.
    520             $query = wp_resolve_numeric_slug_conflicts( $query );
    521 
    522             // Do the query
    523             $query = new WP_Query( $query );
    524             if ( ! empty( $query->posts ) && $query->is_singular )
    525                 return $query->post->ID;
    526             else
    527                 return 0;
    528         }
    529     }
    530     return 0;
    531 }
    532 
    533 /**
    534  * WordPress Rewrite Component.
    535  *
    536  * The WordPress Rewrite class writes the rewrite module rules to the .htaccess
    537  * file. It also handles parsing the request to get the correct setup for the
    538  * WordPress Query class.
    539  *
    540  * The Rewrite along with WP class function as a front controller for WordPress.
    541  * You can add rules to trigger your page view and processing using this
    542  * component. The full functionality of a front controller does not exist,
    543  * meaning you can't define how the template files load based on the rewrite
    544  * rules.
    545  *
    546  * @since 1.5.0
    547  */
    548 class WP_Rewrite {
    549     /**
    550      * Permalink structure for posts.
    551      *
    552      * @since 1.5.0
    553      * @var string
    554      */
    555     public $permalink_structure;
    556 
    557     /**
    558      * Whether to add trailing slashes.
    559      *
    560      * @since 2.2.0
    561      * @var bool
    562      */
    563     public $use_trailing_slashes;
    564 
    565     /**
    566      * Base for the author permalink structure (example.com/$author_base/authorname).
    567      *
    568      * @since 1.5.0
    569      * @access private
    570      * @var string
    571      */
    572     var $author_base = 'author';
    573 
    574     /**
    575      * Permalink structure for author archives.
    576      *
    577      * @since 1.5.0
    578      * @access private
    579      * @var string
    580      */
    581     var $author_structure;
    582 
    583     /**
    584      * Permalink structure for date archives.
    585      *
    586      * @since 1.5.0
    587      * @access private
    588      * @var string
    589      */
    590     var $date_structure;
    591 
    592     /**
    593      * Permalink structure for pages.
    594      *
    595      * @since 1.5.0
    596      * @access private
    597      * @var string
    598      */
    599     var $page_structure;
    600 
    601     /**
    602      * Base of the search permalink structure (example.com/$search_base/query).
    603      *
    604      * @since 1.5.0
    605      * @access private
    606      * @var string
    607      */
    608     var $search_base = 'search';
    609 
    610     /**
    611      * Permalink structure for searches.
    612      *
    613      * @since 1.5.0
    614      * @access private
    615      * @var string
    616      */
    617     var $search_structure;
    618 
    619     /**
    620      * Comments permalink base.
    621      *
    622      * @since 1.5.0
    623      * @access private
    624      * @var string
    625      */
    626     var $comments_base = 'comments';
    627 
    628     /**
    629      * Pagination permalink base.
    630      *
    631      * @since 3.1.0
    632      * @var string
    633      */
    634     public $pagination_base = 'page';
    635 
    636     /**
    637      * Comments pagination permalink base.
    638      *
    639      * @since 4.2.0
    640      * @access private
    641      * @var string
    642      */
    643     var $comments_pagination_base = 'comment-page';
    644 
    645     /**
    646      * Feed permalink base.
    647      *
    648      * @since 1.5.0
    649      * @access private
    650      * @var string
    651      */
    652     var $feed_base = 'feed';
    653 
    654     /**
    655      * Comments feed permalink structure.
    656      *
    657      * @since 1.5.0
    658      * @access private
    659      * @var string
    660      */
    661     var $comment_feed_structure;
    662 
    663     /**
    664      * Feed request permalink structure.
    665      *
    666      * @since 1.5.0
    667      * @access private
    668      * @var string
    669      */
    670     var $feed_structure;
    671 
    672     /**
    673      * The static portion of the post permalink structure.
    674      *
    675      * If the permalink structure is "/archive/%post_id%" then the front
    676      * is "/archive/". If the permalink structure is "/%year%/%postname%/"
    677      * then the front is "/".
    678      *
    679      * @see WP_Rewrite::init()
    680      * @since 1.5.0
    681      * @var string
    682      */
    683     public $front;
    684 
    685     /**
    686      * The prefix for all permalink structures.
    687      *
    688      * If PATHINFO/index permalinks are in use then the root is the value of
    689      * {@link WP_Rewrite::$index} with a trailing slash appended. Otherwise
    690      * the root will be empty.
    691      *
    692      * @see WP_Rewrite::init()
    693      * @see WP_Rewrite::using_index_permalinks()
    694      * @since 1.5.0
    695      * @var string
    696      */
    697     public $root = '';
    698 
    699     /**
    700      * The name of the index file which is the entry point to all requests.
    701      *
    702      * @since 1.5.0
    703      * @access public
    704      * @var string
    705      */
    706     public $index = 'index.php';
    707 
    708     /**
    709      * Variable name to use for regex matches in the rewritten query.
    710      *
    711      * @since 1.5.0
    712      * @access private
    713      * @var string
    714      */
    715     var $matches = '';
    716 
    717     /**
    718      * Rewrite rules to match against the request to find the redirect or query.
    719      *
    720      * @since 1.5.0
    721      * @access private
    722      * @var array
    723      */
    724     var $rules;
    725 
    726     /**
    727      * Additional rules added external to the rewrite class.
    728      *
    729      * Those not generated by the class, see add_rewrite_rule().
    730      *
    731      * @since 2.1.0
    732      * @access private
    733      * @var array
    734      */
    735     var $extra_rules = array();
    736 
    737     /**
    738      * Additional rules that belong at the beginning to match first.
    739      *
    740      * Those not generated by the class, see add_rewrite_rule().
    741      *
    742      * @since 2.3.0
    743      * @access private
    744      * @var array
    745      */
    746     var $extra_rules_top = array();
    747 
    748     /**
    749      * Rules that don't redirect to WordPress' index.php.
    750      *
    751      * These rules are written to the mod_rewrite portion of the .htaccess,
    752      * and are added by {@link add_external_rule()}.
    753      *
    754      * @since 2.1.0
    755      * @access private
    756      * @var array
    757      */
    758     var $non_wp_rules = array();
    759 
    760     /**
    761      * Extra permalink structures, e.g. categories, added by {@link add_permastruct()}.
    762      *
    763      * @since 2.1.0
    764      * @access private
    765      * @var array
    766      */
    767     var $extra_permastructs = array();
    768 
    769     /**
    770      * Endpoints (like /trackback/) added by {@link add_rewrite_endpoint()}.
    771      *
    772      * @since 2.1.0
    773      * @access private
    774      * @var array
    775      */
    776     var $endpoints;
    777 
    778     /**
    779      * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
    780      *
    781      * This is off by default, turning it on might print a lot of rewrite rules
    782      * to the .htaccess file.
    783      *
    784      * @see WP_Rewrite::mod_rewrite_rules()
    785      * @since 2.0.0
    786      * @access public
    787      * @var bool
    788      */
    789     public $use_verbose_rules = false;
    790 
    791     /**
    792      * Could post permalinks be confused with those of pages?
    793      *
    794      * If the first rewrite tag in the post permalink structure is one that could
    795      * also match a page name (e.g. %postname% or %author%) then this flag is
    796      * set to true. Prior to WordPress 3.3 this flag indicated that every page
    797      * would have a set of rules added to the top of the rewrite rules array.
    798      * Now it tells {@link WP::parse_request()} to check if a URL matching the
    799      * page permastruct is actually a page before accepting it.
    800      *
    801      * @link https://core.trac.wordpress.org/ticket/16687
    802      * @see WP_Rewrite::init()
    803      * @since 2.5.0
    804      * @access public
    805      * @var bool
    806      */
    807     public $use_verbose_page_rules = true;
    808 
    809     /**
    810      * Rewrite tags that can be used in permalink structures.
    811      *
    812      * These are translated into the regular expressions stored in
    813      * {@link WP_Rewrite::$rewritereplace} and are rewritten to the
    814      * query variables listed in {@link WP_Rewrite::$queryreplace}.
    815      *
    816      * Additional tags can be added with {@link add_rewrite_tag()}.
    817      *
    818      * @since 1.5.0
    819      * @access private
    820      * @var array
    821      */
    822     var $rewritecode = array(
    823         '%year%',
    824         '%monthnum%',
    825         '%day%',
    826         '%hour%',
    827         '%minute%',
    828         '%second%',
    829         '%postname%',
    830         '%post_id%',
    831         '%author%',
    832         '%pagename%',
    833         '%search%'
    834     );
    835 
    836     /**
    837      * Regular expressions to be substituted into rewrite rules in place
    838      * of rewrite tags, see {@link WP_Rewrite::$rewritecode}.
    839      *
    840      * @since 1.5.0
    841      * @access private
    842      * @var array
    843      */
    844     var $rewritereplace = array(
    845         '([0-9]{4})',
    846         '([0-9]{1,2})',
    847         '([0-9]{1,2})',
    848         '([0-9]{1,2})',
    849         '([0-9]{1,2})',
    850         '([0-9]{1,2})',
    851         '([^/]+)',
    852         '([0-9]+)',
    853         '([^/]+)',
    854         '([^/]+?)',
    855         '(.+)'
    856     );
    857 
    858     /**
    859      * Query variables that rewrite tags map to, see {@link WP_Rewrite::$rewritecode}.
    860      *
    861      * @since 1.5.0
    862      * @access private
    863      * @var array
    864      */
    865     var $queryreplace = array(
    866         'year=',
    867         'monthnum=',
    868         'day=',
    869         'hour=',
    870         'minute=',
    871         'second=',
    872         'name=',
    873         'p=',
    874         'author_name=',
    875         'pagename=',
    876         's='
    877     );
    878 
    879     /**
    880      * Supported default feeds.
    881      *
    882      * @since 1.5.0
    883      * @var array
    884      */
    885     public $feeds = array( 'feed', 'rdf', 'rss', 'rss2', 'atom' );
    886 
    887     /**
    888      * Whether permalinks are being used.
    889      *
    890      * This can be either rewrite module or permalink in the HTTP query string.
    891      *
    892      * @since 1.5.0
    893      * @access public
    894      *
    895      * @return bool True, if permalinks are enabled.
    896      */
    897     public function using_permalinks() {
    898         return ! empty($this->permalink_structure);
    899     }
    900 
    901     /**
    902      * Whether permalinks are being used and rewrite module is not enabled.
    903      *
    904      * Means that permalink links are enabled and index.php is in the URL.
    905      *
    906      * @since 1.5.0
    907      * @access public
    908      *
    909      * @return bool
    910      */
    911     public function using_index_permalinks() {
    912         if ( empty( $this->permalink_structure ) ) {
    913             return false;
    914         }
    915         // If the index is not in the permalink, we're using mod_rewrite.
    916         return preg_match( '#^/*' . $this->index . '#', $this->permalink_structure );
    917     }
    918 
    919     /**
    920      * Whether permalinks are being used and rewrite module is enabled.
    921      *
    922      * Using permalinks and index.php is not in the URL.
    923      *
    924      * @since 1.5.0
    925      * @access public
    926      *
    927      * @return bool
    928      */
    929     public function using_mod_rewrite_permalinks() {
    930         return $this->using_permalinks() && ! $this->using_index_permalinks();
    931     }
    932 
    933     /**
    934      * Index for matches for usage in preg_*() functions.
    935      *
    936      * The format of the string is, with empty matches property value, '$NUM'.
    937      * The 'NUM' will be replaced with the value in the $number parameter. With
    938      * the matches property not empty, the value of the returned string will
    939      * contain that value of the matches property. The format then will be
    940      * '$MATCHES[NUM]', with MATCHES as the value in the property and NUM the
    941      * value of the $number parameter.
    942      *
    943      * @since 1.5.0
    944      * @access public
    945      *
    946      * @param int $number Index number.
    947      * @return string
    948      */
    949     public function preg_index($number) {
    950         $match_prefix = '$';
    951         $match_suffix = '';
    952 
    953         if ( ! empty($this->matches) ) {
    954             $match_prefix = '$' . $this->matches . '[';
    955             $match_suffix = ']';
    956         }
    957 
    958         return "$match_prefix$number$match_suffix";
    959     }
    960 
    961     /**
    962      * Retrieve all page and attachments for pages URIs.
    963      *
    964      * The attachments are for those that have pages as parents and will be
    965      * retrieved.
    966      *
    967      * @since 2.5.0
    968      * @access public
    969      *
    970      * @global wpdb $wpdb
    971      *
    972      * @return array Array of page URIs as first element and attachment URIs as second element.
    973      */
    974     public function page_uri_index() {
    975         global $wpdb;
    976 
    977         //get pages in order of hierarchy, i.e. children after parents
    978         $pages = $wpdb->get_results("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page' AND post_status != 'auto-draft'");
    979         $posts = get_page_hierarchy( $pages );
    980 
    981         // If we have no pages get out quick
    982         if ( !$posts )
    983             return array( array(), array() );
    984 
    985         //now reverse it, because we need parents after children for rewrite rules to work properly
    986         $posts = array_reverse($posts, true);
    987 
    988         $page_uris = array();
    989         $page_attachment_uris = array();
    990 
    991         foreach ( $posts as $id => $post ) {
    992             // URL => page name
    993             $uri = get_page_uri($id);
    994             $attachments = $wpdb->get_results( $wpdb->prepare( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = %d", $id ));
    995             if ( !empty($attachments) ) {
    996                 foreach ( $attachments as $attachment ) {
    997                     $attach_uri = get_page_uri($attachment->ID);
    998                     $page_attachment_uris[$attach_uri] = $attachment->ID;
    999                 }
    1000             }
    1001 
    1002             $page_uris[$uri] = $id;
    1003         }
    1004 
    1005         return array( $page_uris, $page_attachment_uris );
    1006     }
    1007 
    1008     /**
    1009      * Retrieve all of the rewrite rules for pages.
    1010      *
    1011      * @since 1.5.0
    1012      * @access public
    1013      *
    1014      * @return array
    1015      */
    1016     public function page_rewrite_rules() {
    1017         // the extra .? at the beginning prevents clashes with other regular expressions in the rules array
    1018         $this->add_rewrite_tag( '%pagename%', '(.?.+?)', 'pagename=' );
    1019 
    1020         return $this->generate_rewrite_rules( $this->get_page_permastruct(), EP_PAGES, true, true, false, false );
    1021     }
    1022 
    1023     /**
    1024      * Retrieve date permalink structure, with year, month, and day.
    1025      *
    1026      * The permalink structure for the date, if not set already depends on the
    1027      * permalink structure. It can be one of three formats. The first is year,
    1028      * month, day; the second is day, month, year; and the last format is month,
    1029      * day, year. These are matched against the permalink structure for which
    1030      * one is used. If none matches, then the default will be used, which is
    1031      * year, month, day.
    1032      *
    1033      * Prevents post ID and date permalinks from overlapping. In the case of
    1034      * post_id, the date permalink will be prepended with front permalink with
    1035      * 'date/' before the actual permalink to form the complete date permalink
    1036      * structure.
    1037      *
    1038      * @since 1.5.0
    1039      * @access public
    1040      *
    1041      * @return string|false False on no permalink structure. Date permalink structure.
    1042      */
    1043     public function get_date_permastruct() {
    1044         if ( isset($this->date_structure) )
    1045             return $this->date_structure;
    1046 
    1047         if ( empty($this->permalink_structure) ) {
    1048             $this->date_structure = '';
    1049             return false;
    1050         }
    1051 
    1052         // The date permalink must have year, month, and day separated by slashes.
    1053         $endians = array('%year%/%monthnum%/%day%', '%day%/%monthnum%/%year%', '%monthnum%/%day%/%year%');
    1054 
    1055         $this->date_structure = '';
    1056         $date_endian = '';
    1057 
    1058         foreach ( $endians as $endian ) {
    1059             if ( false !== strpos($this->permalink_structure, $endian) ) {
    1060                 $date_endian= $endian;
    1061                 break;
    1062             }
    1063         }
    1064 
    1065         if ( empty($date_endian) )
    1066             $date_endian = '%year%/%monthnum%/%day%';
    1067 
    1068         // Do not allow the date tags and %post_id% to overlap in the permalink
    1069         // structure. If they do, move the date tags to $front/date/.
    1070         $front = $this->front;
    1071         preg_match_all('/%.+?%/', $this->permalink_structure, $tokens);
    1072         $tok_index = 1;
    1073         foreach ( (array) $tokens[0] as $token) {
    1074             if ( '%post_id%' == $token && ($tok_index <= 3) ) {
    1075                 $front = $front . 'date/';
    1076                 break;
    1077             }
    1078             $tok_index++;
    1079         }
    1080 
    1081         $this->date_structure = $front . $date_endian;
    1082 
    1083         return $this->date_structure;
    1084     }
    1085 
    1086     /**
    1087      * Retrieve the year permalink structure without month and day.
    1088      *
    1089      * Gets the date permalink structure and strips out the month and day
    1090      * permalink structures.
    1091      *
    1092      * @since 1.5.0
    1093      * @access public
    1094      *
    1095      * @return false|string False on failure. Year structure on success.
    1096      */
    1097     public function get_year_permastruct() {
    1098         $structure = $this->get_date_permastruct();
    1099 
    1100         if ( empty($structure) )
    1101             return false;
    1102 
    1103         $structure = str_replace('%monthnum%', '', $structure);
    1104         $structure = str_replace('%day%', '', $structure);
    1105         $structure = preg_replace('#/+#', '/', $structure);
    1106 
    1107         return $structure;
    1108     }
    1109 
    1110     /**
    1111      * Retrieve the month permalink structure without day and with year.
    1112      *
    1113      * Gets the date permalink structure and strips out the day permalink
    1114      * structures. Keeps the year permalink structure.
    1115      *
    1116      * @since 1.5.0
    1117      * @access public
    1118      *
    1119      * @return false|string False on failure. Year/Month structure on success.
    1120      */
    1121     public function get_month_permastruct() {
    1122         $structure = $this->get_date_permastruct();
    1123 
    1124         if ( empty($structure) )
    1125             return false;
    1126 
    1127         $structure = str_replace('%day%', '', $structure);
    1128         $structure = preg_replace('#/+#', '/', $structure);
    1129 
    1130         return $structure;
    1131     }
    1132 
    1133     /**
    1134      * Retrieve the day permalink structure with month and year.
    1135      *
    1136      * Keeps date permalink structure with all year, month, and day.
    1137      *
    1138      * @since 1.5.0
    1139      * @access public
    1140      *
    1141      * @return string|false False on failure. Year/Month/Day structure on success.
    1142      */
    1143     public function get_day_permastruct() {
    1144         return $this->get_date_permastruct();
    1145     }
    1146 
    1147     /**
    1148      * Retrieve the permalink structure for categories.
    1149      *
    1150      * If the category_base property has no value, then the category structure
    1151      * will have the front property value, followed by 'category', and finally
    1152      * '%category%'. If it does, then the root property will be used, along with
    1153      * the category_base property value.
    1154      *
    1155      * @since 1.5.0
    1156      * @access public
    1157      *
    1158      * @return string|false False on failure. Category permalink structure.
    1159      */
    1160     public function get_category_permastruct() {
    1161         return $this->get_extra_permastruct('category');
    1162     }
    1163 
    1164     /**
    1165      * Retrieve the permalink structure for tags.
    1166      *
    1167      * If the tag_base property has no value, then the tag structure will have
    1168      * the front property value, followed by 'tag', and finally '%tag%'. If it
    1169      * does, then the root property will be used, along with the tag_base
    1170      * property value.
    1171      *
    1172      * @since 2.3.0
    1173      * @access public
    1174      *
    1175      * @return string|false False on failure. Tag permalink structure.
    1176      */
    1177     public function get_tag_permastruct() {
    1178         return $this->get_extra_permastruct('post_tag');
    1179     }
    1180 
    1181     /**
    1182      * Retrieve extra permalink structure by name.
    1183      *
    1184      * @since 2.5.0
    1185      * @access public
    1186      *
    1187      * @param string $name Permalink structure name.
    1188      * @return string|false False if not found. Permalink structure string.
    1189      */
    1190     public function get_extra_permastruct($name) {
    1191         if ( empty($this->permalink_structure) )
    1192             return false;
    1193 
    1194         if ( isset($this->extra_permastructs[$name]) )
    1195             return $this->extra_permastructs[$name]['struct'];
    1196 
    1197         return false;
    1198     }
    1199 
    1200     /**
    1201      * Retrieve the author permalink structure.
    1202      *
    1203      * The permalink structure is front property, author base, and finally
    1204      * '/%author%'. Will set the author_structure property and then return it
    1205      * without attempting to set the value again.
    1206      *
    1207      * @since 1.5.0
    1208      * @access public
    1209      *
    1210      * @return string|false False if not found. Permalink structure string.
    1211      */
    1212     public function get_author_permastruct() {
    1213         if ( isset($this->author_structure) )
    1214             return $this->author_structure;
    1215 
    1216         if ( empty($this->permalink_structure) ) {
    1217             $this->author_structure = '';
    1218             return false;
    1219         }
    1220 
    1221         $this->author_structure = $this->front . $this->author_base . '/%author%';
    1222 
    1223         return $this->author_structure;
    1224     }
    1225 
    1226     /**
    1227      * Retrieve the search permalink structure.
    1228      *
    1229      * The permalink structure is root property, search base, and finally
    1230      * '/%search%'. Will set the search_structure property and then return it
    1231      * without attempting to set the value again.
    1232      *
    1233      * @since 1.5.0
    1234      * @access public
    1235      *
    1236      * @return string|false False if not found. Permalink structure string.
    1237      */
    1238     public function get_search_permastruct() {
    1239         if ( isset($this->search_structure) )
    1240             return $this->search_structure;
    1241 
    1242         if ( empty($this->permalink_structure) ) {
    1243             $this->search_structure = '';
    1244             return false;
    1245         }
    1246 
    1247         $this->search_structure = $this->root . $this->search_base . '/%search%';
    1248 
    1249         return $this->search_structure;
    1250     }
    1251 
    1252     /**
    1253      * Retrieve the page permalink structure.
    1254      *
    1255      * The permalink structure is root property, and '%pagename%'. Will set the
    1256      * page_structure property and then return it without attempting to set the
    1257      * value again.
    1258      *
    1259      * @since 1.5.0
    1260      * @access public
    1261      *
    1262      * @return string|false False if not found. Permalink structure string.
    1263      */
    1264     public function get_page_permastruct() {
    1265         if ( isset($this->page_structure) )
    1266             return $this->page_structure;
    1267 
    1268         if (empty($this->permalink_structure)) {
    1269             $this->page_structure = '';
    1270             return false;
    1271         }
    1272 
    1273         $this->page_structure = $this->root . '%pagename%';
    1274 
    1275         return $this->page_structure;
    1276     }
    1277 
    1278     /**
    1279      * Retrieve the feed permalink structure.
    1280      *
    1281      * The permalink structure is root property, feed base, and finally
    1282      * '/%feed%'. Will set the feed_structure property and then return it
    1283      * without attempting to set the value again.
    1284      *
    1285      * @since 1.5.0
    1286      * @access public
    1287      *
    1288      * @return string|false False if not found. Permalink structure string.
    1289      */
    1290     public function get_feed_permastruct() {
    1291         if ( isset($this->feed_structure) )
    1292             return $this->feed_structure;
    1293 
    1294         if ( empty($this->permalink_structure) ) {
    1295             $this->feed_structure = '';
    1296             return false;
    1297         }
    1298 
    1299         $this->feed_structure = $this->root . $this->feed_base . '/%feed%';
    1300 
    1301         return $this->feed_structure;
    1302     }
    1303 
    1304     /**
    1305      * Retrieve the comment feed permalink structure.
    1306      *
    1307      * The permalink structure is root property, comment base property, feed
    1308      * base and finally '/%feed%'. Will set the comment_feed_structure property
    1309      * and then return it without attempting to set the value again.
    1310      *
    1311      * @since 1.5.0
    1312      * @access public
    1313      *
    1314      * @return string|false False if not found. Permalink structure string.
    1315      */
    1316     public function get_comment_feed_permastruct() {
    1317         if ( isset($this->comment_feed_structure) )
    1318             return $this->comment_feed_structure;
    1319 
    1320         if (empty($this->permalink_structure)) {
    1321             $this->comment_feed_structure = '';
    1322             return false;
    1323         }
    1324 
    1325         $this->comment_feed_structure = $this->root . $this->comments_base . '/' . $this->feed_base . '/%feed%';
    1326 
    1327         return $this->comment_feed_structure;
    1328     }
    1329 
    1330     /**
    1331      * Add or update existing rewrite tags (e.g. %postname%).
    1332      *
    1333      * If the tag already exists, replace the existing pattern and query for
    1334      * that tag, otherwise add the new tag.
    1335      *
    1336      * @see WP_Rewrite::$rewritecode
    1337      * @see WP_Rewrite::$rewritereplace
    1338      * @see WP_Rewrite::$queryreplace
    1339      * @since 1.5.0
    1340      * @access public
    1341      *
    1342      * @param string $tag   Name of the rewrite tag to add or update.
    1343      * @param string $regex Regular expression to substitute the tag for in rewrite rules.
    1344      * @param string $query String to append to the rewritten query. Must end in '='.
    1345      */
    1346     public function add_rewrite_tag( $tag, $regex, $query ) {
    1347         $position = array_search( $tag, $this->rewritecode );
    1348         if ( false !== $position && null !== $position ) {
    1349             $this->rewritereplace[ $position ] = $regex;
    1350             $this->queryreplace[ $position ] = $query;
    1351         } else {
    1352             $this->rewritecode[] = $tag;
    1353             $this->rewritereplace[] = $regex;
    1354             $this->queryreplace[] = $query;
    1355         }
    1356     }
    1357 
    1358     /**
    1359      * Generate rewrite rules from a permalink structure.
    1360      *
    1361      * The main WP_Rewrite function for building the rewrite rule list. The
    1362      * contents of the function is a mix of black magic and regular expressions,
    1363      * so best just ignore the contents and move to the parameters.
    1364      *
    1365      * @since 1.5.0
    1366      * @access public
    1367      *
    1368      * @param string $permalink_structure The permalink structure.
    1369      * @param int    $ep_mask             Endpoint mask defining what endpoints are added to the structure. Default is EP_NONE.
    1370      * @param bool   $paged               Should archive pagination rules be added for the structure? Default is true.
    1371      * @param bool   $feed                Should feed rewrite rules be added for the structure? Default is true.
    1372      * @param bool   $forcomments         Should the feed rules be a query for a comments feed? Default is false.
    1373      * @param bool   $walk_dirs           Should the 'directories' making up the structure be walked over and rewrite rules
    1374      *                                    built for each in turn? Default is true.
    1375      * @param bool   $endpoints           Should endpoints be applied to the generated rewrite rules? Default is true.
    1376      * @return array Rewrite rule list.
    1377      */
    1378     public function generate_rewrite_rules($permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true) {
    1379         //build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
    1380         $feedregex2 = '';
    1381         foreach ( (array) $this->feeds as $feed_name)
    1382             $feedregex2 .= $feed_name . '|';
    1383         $feedregex2 = '(' . trim($feedregex2, '|') . ')/?$';
    1384 
    1385         //$feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom
    1386         //and <permalink>/atom are both possible
    1387         $feedregex = $this->feed_base . '/' . $feedregex2;
    1388 
    1389         //build a regex to match the trackback and page/xx parts of URLs
    1390         $trackbackregex = 'trackback/?$';
    1391         $pageregex = $this->pagination_base . '/?([0-9]{1,})/?$';
    1392         $commentregex = $this->comments_pagination_base . '-([0-9]{1,})/?$';
    1393 
    1394         //build up an array of endpoint regexes to append => queries to append
    1395         if ( $endpoints ) {
    1396             $ep_query_append = array ();
    1397             foreach ( (array) $this->endpoints as $endpoint) {
    1398                 //match everything after the endpoint name, but allow for nothing to appear there
    1399                 $epmatch = $endpoint[1] . '(/(.*))?/?$';
    1400                 //this will be appended on to the rest of the query for each dir
    1401                 $epquery = '&' . $endpoint[2] . '=';
    1402                 $ep_query_append[$epmatch] = array ( $endpoint[0], $epquery );
    1403             }
    1404         }
    1405 
    1406         //get everything up to the first rewrite tag
    1407         $front = substr($permalink_structure, 0, strpos($permalink_structure, '%'));
    1408         //build an array of the tags (note that said array ends up being in $tokens[0])
    1409         preg_match_all('/%.+?%/', $permalink_structure, $tokens);
    1410 
    1411         $num_tokens = count($tokens[0]);
    1412 
    1413         $index = $this->index; //probably 'index.php'
    1414         $feedindex = $index;
    1415         $trackbackindex = $index;
    1416         //build a list from the rewritecode and queryreplace arrays, that will look something like
    1417         //tagname=$matches[i] where i is the current $i
    1418         $queries = array();
    1419         for ( $i = 0; $i < $num_tokens; ++$i ) {
    1420             if ( 0 < $i )
    1421                 $queries[$i] = $queries[$i - 1] . '&';
    1422             else
    1423                 $queries[$i] = '';
    1424 
    1425             $query_token = str_replace($this->rewritecode, $this->queryreplace, $tokens[0][$i]) . $this->preg_index($i+1);
    1426             $queries[$i] .= $query_token;
    1427         }
    1428 
    1429         //get the structure, minus any cruft (stuff that isn't tags) at the front
    1430         $structure = $permalink_structure;
    1431         if ( $front != '/' )
    1432             $structure = str_replace($front, '', $structure);
    1433 
    1434         //create a list of dirs to walk over, making rewrite rules for each level
    1435         //so for example, a $structure of /%year%/%monthnum%/%postname% would create
    1436         //rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
    1437         $structure = trim($structure, '/');
    1438         $dirs = $walk_dirs ? explode('/', $structure) : array( $structure );
    1439         $num_dirs = count($dirs);
    1440 
    1441         //strip slashes from the front of $front
    1442         $front = preg_replace('|^/+|', '', $front);
    1443 
    1444         //the main workhorse loop
    1445         $post_rewrite = array();
    1446         $struct = $front;
    1447         for ( $j = 0; $j < $num_dirs; ++$j ) {
    1448             //get the struct for this dir, and trim slashes off the front
    1449             $struct .= $dirs[$j] . '/'; //accumulate. see comment near explode('/', $structure) above
    1450             $struct = ltrim($struct, '/');
    1451 
    1452             //replace tags with regexes
    1453             $match = str_replace($this->rewritecode, $this->rewritereplace, $struct);
    1454 
    1455             //make a list of tags, and store how many there are in $num_toks
    1456             $num_toks = preg_match_all('/%.+?%/', $struct, $toks);
    1457 
    1458             //get the 'tagname=$matches[i]'
    1459             $query = ( ! empty( $num_toks ) && isset( $queries[$num_toks - 1] ) ) ? $queries[$num_toks - 1] : '';
    1460 
    1461             //set up $ep_mask_specific which is used to match more specific URL types
    1462             switch ( $dirs[$j] ) {
    1463                 case '%year%':
    1464                     $ep_mask_specific = EP_YEAR;
    1465                     break;
    1466                 case '%monthnum%':
    1467                     $ep_mask_specific = EP_MONTH;
    1468                     break;
    1469                 case '%day%':
    1470                     $ep_mask_specific = EP_DAY;
    1471                     break;
    1472                 default:
    1473                     $ep_mask_specific = EP_NONE;
    1474             }
    1475 
    1476             //create query for /page/xx
    1477             $pagematch = $match . $pageregex;
    1478             $pagequery = $index . '?' . $query . '&paged=' . $this->preg_index($num_toks + 1);
    1479 
    1480             //create query for /comment-page-xx
    1481             $commentmatch = $match . $commentregex;
    1482             $commentquery = $index . '?' . $query . '&cpage=' . $this->preg_index($num_toks + 1);
    1483 
    1484             if ( get_option('page_on_front') ) {
    1485                 //create query for Root /comment-page-xx
    1486                 $rootcommentmatch = $match . $commentregex;
    1487                 $rootcommentquery = $index . '?' . $query . '&page_id=' . get_option('page_on_front') . '&cpage=' . $this->preg_index($num_toks + 1);
    1488             }
    1489 
    1490             //create query for /feed/(feed|atom|rss|rss2|rdf)
    1491             $feedmatch = $match . $feedregex;
    1492             $feedquery = $feedindex . '?' . $query . '&feed=' . $this->preg_index($num_toks + 1);
    1493 
    1494             //create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex)
    1495             $feedmatch2 = $match . $feedregex2;
    1496             $feedquery2 = $feedindex . '?' . $query . '&feed=' . $this->preg_index($num_toks + 1);
    1497 
    1498             //if asked to, turn the feed queries into comment feed ones
    1499             if ( $forcomments ) {
    1500                 $feedquery .= '&withcomments=1';
    1501                 $feedquery2 .= '&withcomments=1';
    1502             }
    1503 
    1504             //start creating the array of rewrites for this dir
    1505             $rewrite = array();
    1506             if ( $feed ) //...adding on /feed/ regexes => queries
    1507                 $rewrite = array($feedmatch => $feedquery, $feedmatch2 => $feedquery2);
    1508             if ( $paged ) //...and /page/xx ones
    1509                 $rewrite = array_merge($rewrite, array($pagematch => $pagequery));
    1510 
    1511             //only on pages with comments add ../comment-page-xx/
    1512             if ( EP_PAGES & $ep_mask || EP_PERMALINK & $ep_mask ) {
    1513                 $rewrite = array_merge($rewrite, array($commentmatch => $commentquery));
    1514             } elseif ( EP_ROOT & $ep_mask && get_option('page_on_front') ) {
    1515                 $rewrite = array_merge($rewrite, array($rootcommentmatch => $rootcommentquery));
    1516             }
    1517             //do endpoints
    1518             if ( $endpoints ) {
    1519                 foreach ( (array) $ep_query_append as $regex => $ep) {
    1520                     //add the endpoints on if the mask fits
    1521                     if ( $ep[0] & $ep_mask || $ep[0] & $ep_mask_specific )
    1522                         $rewrite[$match . $regex] = $index . '?' . $query . $ep[1] . $this->preg_index($num_toks + 2);
    1523                 }
    1524             }
    1525 
    1526             //if we've got some tags in this dir
    1527             if ( $num_toks ) {
    1528                 $post = false;
    1529                 $page = false;
    1530 
    1531                 //check to see if this dir is permalink-level: i.e. the structure specifies an
    1532                 //individual post. Do this by checking it contains at least one of 1) post name,
    1533                 //2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
    1534                 //minute all present). Set these flags now as we need them for the endpoints.
    1535                 if ( strpos($struct, '%postname%') !== false
    1536                         || strpos($struct, '%post_id%') !== false
    1537                         || strpos($struct, '%pagename%') !== false
    1538                         || (strpos($struct, '%year%') !== false && strpos($struct, '%monthnum%') !== false && strpos($struct, '%day%') !== false && strpos($struct, '%hour%') !== false && strpos($struct, '%minute%') !== false && strpos($struct, '%second%') !== false)
    1539                         ) {
    1540                     $post = true;
    1541                     if ( strpos($struct, '%pagename%') !== false )
    1542                         $page = true;
    1543                 }
    1544 
    1545                 if ( ! $post ) {
    1546                     // For custom post types, we need to add on endpoints as well.
    1547                     foreach ( get_post_types( array('_builtin' => false ) ) as $ptype ) {
    1548                         if ( strpos($struct, "%$ptype%") !== false ) {
    1549                             $post = true;
    1550                             $page = is_post_type_hierarchical( $ptype ); // This is for page style attachment url's
    1551                             break;
    1552                         }
    1553                     }
    1554                 }
    1555 
    1556                 //if we're creating rules for a permalink, do all the endpoints like attachments etc
    1557                 if ( $post ) {
    1558                     //create query and regex for trackback
    1559                     $trackbackmatch = $match . $trackbackregex;
    1560                     $trackbackquery = $trackbackindex . '?' . $query . '&tb=1';
    1561                     //trim slashes from the end of the regex for this dir
    1562                     $match = rtrim($match, '/');
    1563                     //get rid of brackets
    1564                     $submatchbase = str_replace( array('(', ')'), '', $match);
    1565 
    1566                     //add a rule for at attachments, which take the form of <permalink>/some-text
    1567                     $sub1 = $submatchbase . '/([^/]+)/';
    1568                     $sub1tb = $sub1 . $trackbackregex; //add trackback regex <permalink>/trackback/...
    1569                     $sub1feed = $sub1 . $feedregex; //and <permalink>/feed/(atom|...)
    1570                     $sub1feed2 = $sub1 . $feedregex2; //and <permalink>/(feed|atom...)
    1571                     $sub1comment = $sub1 . $commentregex; //and <permalink>/comment-page-xx
    1572 
    1573                     //add another rule to match attachments in the explicit form:
    1574                     //<permalink>/attachment/some-text
    1575                     $sub2 = $submatchbase . '/attachment/([^/]+)/';
    1576                     $sub2tb = $sub2 . $trackbackregex; //and add trackbacks <permalink>/attachment/trackback
    1577                     $sub2feed = $sub2 . $feedregex;    //feeds, <permalink>/attachment/feed/(atom|...)
    1578                     $sub2feed2 = $sub2 . $feedregex2;  //and feeds again on to this <permalink>/attachment/(feed|atom...)
    1579                     $sub2comment = $sub2 . $commentregex; //and <permalink>/comment-page-xx
    1580 
    1581                     //create queries for these extra tag-ons we've just dealt with
    1582                     $subquery = $index . '?attachment=' . $this->preg_index(1);
    1583                     $subtbquery = $subquery . '&tb=1';
    1584                     $subfeedquery = $subquery . '&feed=' . $this->preg_index(2);
    1585                     $subcommentquery = $subquery . '&cpage=' . $this->preg_index(2);
    1586 
    1587                     //do endpoints for attachments
    1588                     if ( !empty($endpoints) ) {
    1589                         foreach ( (array) $ep_query_append as $regex => $ep ) {
    1590                             if ( $ep[0] & EP_ATTACHMENT ) {
    1591                                 $rewrite[$sub1 . $regex] = $subquery . $ep[1] . $this->preg_index(3);
    1592                                 $rewrite[$sub2 . $regex] = $subquery . $ep[1] . $this->preg_index(3);
    1593                             }
    1594                         }
    1595                     }
    1596 
    1597                     //now we've finished with endpoints, finish off the $sub1 and $sub2 matches
    1598                     //add a ? as we don't have to match that last slash, and finally a $ so we
    1599                     //match to the end of the URL
    1600                     $sub1 .= '?$';
    1601                     $sub2 .= '?$';
    1602 
    1603                     //post pagination, e.g. <permalink>/2/
    1604                     $match = $match . '(/[0-9]+)?/?$';
    1605                     $query = $index . '?' . $query . '&page=' . $this->preg_index($num_toks + 1);
    1606                 } else { //not matching a permalink so this is a lot simpler
    1607                     //close the match and finalise the query
    1608                     $match .= '?$';
    1609                     $query = $index . '?' . $query;
    1610                 }
    1611 
    1612                 //create the final array for this dir by joining the $rewrite array (which currently
    1613                 //only contains rules/queries for trackback, pages etc) to the main regex/query for
    1614                 //this dir
    1615                 $rewrite = array_merge($rewrite, array($match => $query));
    1616 
    1617                 //if we're matching a permalink, add those extras (attachments etc) on
    1618                 if ( $post ) {
    1619                     //add trackback
    1620                     $rewrite = array_merge(array($trackbackmatch => $trackbackquery), $rewrite);
    1621 
    1622                     //add regexes/queries for attachments, attachment trackbacks and so on
    1623                     if ( ! $page ) //require <permalink>/attachment/stuff form for pages because of confusion with subpages
    1624                         $rewrite = array_merge($rewrite, array($sub1 => $subquery, $sub1tb => $subtbquery, $sub1feed => $subfeedquery, $sub1feed2 => $subfeedquery, $sub1comment => $subcommentquery));
    1625                     $rewrite = array_merge(array($sub2 => $subquery, $sub2tb => $subtbquery, $sub2feed => $subfeedquery, $sub2feed2 => $subfeedquery, $sub2comment => $subcommentquery), $rewrite);
    1626                 }
    1627             } //if($num_toks)
    1628             //add the rules for this dir to the accumulating $post_rewrite
    1629             $post_rewrite = array_merge($rewrite, $post_rewrite);
    1630         } //foreach ($dir)
    1631         return $post_rewrite; //the finished rules. phew!
    1632     }
    1633 
    1634     /**
    1635      * Generate Rewrite rules with permalink structure and walking directory only.
    1636      *
    1637      * Shorten version of {@link WP_Rewrite::generate_rewrite_rules()} that
    1638      * allows for shorter list of parameters. See the method for longer
    1639      * description of what generating rewrite rules does.
    1640      *
    1641      * @uses WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
    1642      * @since 1.5.0
    1643      * @access public
    1644      *
    1645      * @param string $permalink_structure The permalink structure to generate rules.
    1646      * @param bool   $walk_dirs           Optional, default is false. Whether to create list of directories to walk over.
    1647      * @return array
    1648      */
    1649     public function generate_rewrite_rule($permalink_structure, $walk_dirs = false) {
    1650         return $this->generate_rewrite_rules($permalink_structure, EP_NONE, false, false, false, $walk_dirs);
    1651     }
    1652 
    1653     /**
    1654      * Construct rewrite matches and queries from permalink structure.
    1655      *
    1656      * Runs the action 'generate_rewrite_rules' with the parameter that is an
    1657      * reference to the current WP_Rewrite instance to further manipulate the
    1658      * permalink structures and rewrite rules. Runs the 'rewrite_rules_array'
    1659      * filter on the full rewrite rule array.
    1660      *
    1661      * There are two ways to manipulate the rewrite rules, one by hooking into
    1662      * the 'generate_rewrite_rules' action and gaining full control of the
    1663      * object or just manipulating the rewrite rule array before it is passed
    1664      * from the function.
    1665      *
    1666      * @since 1.5.0
    1667      * @access public
    1668      *
    1669      * @return array An associate array of matches and queries.
    1670      */
    1671     public function rewrite_rules() {
    1672         $rewrite = array();
    1673 
    1674         if ( empty($this->permalink_structure) )
    1675             return $rewrite;
    1676 
    1677         // robots.txt -only if installed at the root
    1678         $home_path = parse_url( home_url() );
    1679         $robots_rewrite = ( empty( $home_path['path'] ) || '/' == $home_path['path'] ) ? array( 'robots\.txt$' => $this->index . '?robots=1' ) : array();
    1680 
    1681         // Old feed and service files
    1682         $deprecated_files = array(
    1683             '.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
    1684             '.*wp-app\.php(/.*)?$' => $this->index . '?error=403',
    1685         );
    1686 
    1687         // Registration rules
    1688         $registration_pages = array();
    1689         if ( is_multisite() && is_main_site() ) {
    1690             $registration_pages['.*wp-signup.php$'] = $this->index . '?signup=true';
    1691             $registration_pages['.*wp-activate.php$'] = $this->index . '?activate=true';
    1692         }
    1693         $registration_pages['.*wp-register.php$'] = $this->index . '?register=true'; // Deprecated
    1694 
    1695         // Post rewrite rules.
    1696         $post_rewrite = $this->generate_rewrite_rules( $this->permalink_structure, EP_PERMALINK );
    1697 
    1698         /**
    1699          * Filter rewrite rules used for "post" archives.
    1700          *
    1701          * @since 1.5.0
    1702          *
    1703          * @param array $post_rewrite The rewrite rules for posts.
    1704          */
    1705         $post_rewrite = apply_filters( 'post_rewrite_rules', $post_rewrite );
    1706 
    1707         // Date rewrite rules.
    1708         $date_rewrite = $this->generate_rewrite_rules($this->get_date_permastruct(), EP_DATE);
    1709 
    1710         /**
    1711          * Filter rewrite rules used for date archives.
    1712          *
    1713