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Ignore:
Timestamp:
08/26/2016 06:10:23 PM (8 years ago)
Author:
wonderboymusic
Message:

Load: move WP_MatchesMapRegex into its own file.

See #37827.

File:
1 copied

Legend:

Unmodified
Added
Removed

  • trunk/src/wp-includes/class-wp-matchesmapregex.php

    r38370 r38376  
    11<?php
    22/**
    3  * WordPress environment setup class.
     3 * WP_MatchesMapRegex helper class
    44 *
    55 * @package WordPress
    6  * @since 2.0.0
     6 * @since 4.7.0
    77 */
    8 class WP {
    9     /**
    10      * Public query variables.
    11      *
    12      * Long list of public query variables.
    13      *
    14      * @since 2.0.0
    15      * @access public
    16      * @var array
    17      */
    18     public $public_query_vars = array('m', 'p', 'posts', 'w', 'cat', 'withcomments', 'withoutcomments', 's', 'search', 'exact', 'sentence', 'calendar', 'page', 'paged', 'more', 'tb', 'pb', 'author', 'order', 'orderby', 'year', 'monthnum', 'day', 'hour', 'minute', 'second', 'name', 'category_name', 'tag', 'feed', 'author_name', 'static', 'pagename', 'page_id', 'error', 'attachment', 'attachment_id', 'subpost', 'subpost_id', 'preview', 'robots', 'taxonomy', 'term', 'cpage', 'post_type', 'embed' );
    19 
    20     /**
    21      * Private query variables.
    22      *
    23      * Long list of private query variables.
    24      *
    25      * @since 2.0.0
    26      * @access public
    27      * @var array
    28      */
    29     public $private_query_vars = array( 'offset', 'posts_per_page', 'posts_per_archive_page', 'showposts', 'nopaging', 'post_type', 'post_status', 'category__in', 'category__not_in', 'category__and', 'tag__in', 'tag__not_in', 'tag__and', 'tag_slug__in', 'tag_slug__and', 'tag_id', 'post_mime_type', 'perm', 'comments_per_page', 'post__in', 'post__not_in', 'post_parent', 'post_parent__in', 'post_parent__not_in', 'title' );
    30 
    31     /**
    32      * Extra query variables set by the user.
    33      *
    34      * @since 2.1.0
    35      * @access public
    36      * @var array
    37      */
    38     public $extra_query_vars = array();
    39 
    40     /**
    41      * Query variables for setting up the WordPress Query Loop.
    42      *
    43      * @since 2.0.0
    44      * @access public
    45      * @var array
    46      */
    47     public $query_vars;
    48 
    49     /**
    50      * String parsed to set the query variables.
    51      *
    52      * @since 2.0.0
    53      * @access public
    54      * @var string
    55      */
    56     public $query_string;
    57 
    58     /**
    59      * The request path, e.g. 2015/05/06.
    60      *
    61      * @since 2.0.0
    62      * @access public
    63      * @var string
    64      */
    65     public $request;
    66 
    67     /**
    68      * Rewrite rule the request matched.
    69      *
    70      * @since 2.0.0
    71      * @access public
    72      * @var string
    73      */
    74     public $matched_rule;
    75 
    76     /**
    77      * Rewrite query the request matched.
    78      *
    79      * @since 2.0.0
    80      * @access public
    81      * @var string
    82      */
    83     public $matched_query;
    84 
    85     /**
    86      * Whether already did the permalink.
    87      *
    88      * @since 2.0.0
    89      * @access public
    90      * @var bool
    91      */
    92     public $did_permalink = false;
    93 
    94     /**
    95      * Add name to list of public query variables.
    96      *
    97      * @since 2.1.0
    98      * @access public
    99      *
    100      * @param string $qv Query variable name.
    101      */
    102     public function add_query_var($qv) {
    103         if ( !in_array($qv, $this->public_query_vars) )
    104             $this->public_query_vars[] = $qv;
    105     }
    106 
    107     /**
    108      * Removes a query variable from a list of public query variables.
    109      *
    110      * @since 4.5.0
    111      * @access public
    112      *
    113      * @param string $name Query variable name.
    114      */
    115     public function remove_query_var( $name ) {
    116         $this->public_query_vars = array_diff( $this->public_query_vars, array( $name ) );
    117     }
    118 
    119     /**
    120      * Set the value of a query variable.
    121      *
    122      * @since 2.3.0
    123      * @access public
    124      *
    125      * @param string $key Query variable name.
    126      * @param mixed $value Query variable value.
    127      */
    128     public function set_query_var($key, $value) {
    129         $this->query_vars[$key] = $value;
    130     }
    131 
    132     /**
    133      * Parse request to find correct WordPress query.
    134      *
    135      * Sets up the query variables based on the request. There are also many
    136      * filters and actions that can be used to further manipulate the result.
    137      *
    138      * @since 2.0.0
    139      * @access public
    140      *
    141      * @global WP_Rewrite $wp_rewrite
    142      *
    143      * @param array|string $extra_query_vars Set the extra query variables.
    144      */
    145     public function parse_request($extra_query_vars = '') {
    146         global $wp_rewrite;
    147 
    148         /**
    149          * Filters whether to parse the request.
    150          *
    151          * @since 3.5.0
    152          *
    153          * @param bool         $bool             Whether or not to parse the request. Default true.
    154          * @param WP           $this             Current WordPress environment instance.
    155          * @param array|string $extra_query_vars Extra passed query variables.
    156          */
    157         if ( ! apply_filters( 'do_parse_request', true, $this, $extra_query_vars ) )
    158             return;
    159 
    160         $this->query_vars = array();
    161         $post_type_query_vars = array();
    162 
    163         if ( is_array( $extra_query_vars ) ) {
    164             $this->extra_query_vars = & $extra_query_vars;
    165         } elseif ( ! empty( $extra_query_vars ) ) {
    166             parse_str( $extra_query_vars, $this->extra_query_vars );
    167         }
    168         // Process PATH_INFO, REQUEST_URI, and 404 for permalinks.
    169 
    170         // Fetch the rewrite rules.
    171         $rewrite = $wp_rewrite->wp_rewrite_rules();
    172 
    173         if ( ! empty($rewrite) ) {
    174             // If we match a rewrite rule, this will be cleared.
    175             $error = '404';
    176             $this->did_permalink = true;
    177 
    178             $pathinfo = isset( $_SERVER['PATH_INFO'] ) ? $_SERVER['PATH_INFO'] : '';
    179             list( $pathinfo ) = explode( '?', $pathinfo );
    180             $pathinfo = str_replace( "%", "%25", $pathinfo );
    181 
    182             list( $req_uri ) = explode( '?', $_SERVER['REQUEST_URI'] );
    183             $self = $_SERVER['PHP_SELF'];
    184             $home_path = trim( parse_url( home_url(), PHP_URL_PATH ), '/' );
    185             $home_path_regex = sprintf( '|^%s|i', preg_quote( $home_path, '|' ) );
    186 
    187             // Trim path info from the end and the leading home path from the
    188             // front. For path info requests, this leaves us with the requesting
    189             // filename, if any. For 404 requests, this leaves us with the
    190             // requested permalink.
    191             $req_uri = str_replace($pathinfo, '', $req_uri);
    192             $req_uri = trim($req_uri, '/');
    193             $req_uri = preg_replace( $home_path_regex, '', $req_uri );
    194             $req_uri = trim($req_uri, '/');
    195             $pathinfo = trim($pathinfo, '/');
    196             $pathinfo = preg_replace( $home_path_regex, '', $pathinfo );
    197             $pathinfo = trim($pathinfo, '/');
    198             $self = trim($self, '/');
    199             $self = preg_replace( $home_path_regex, '', $self );
    200             $self = trim($self, '/');
    201 
    202             // The requested permalink is in $pathinfo for path info requests and
    203             //  $req_uri for other requests.
    204             if ( ! empty($pathinfo) && !preg_match('|^.*' . $wp_rewrite->index . '$|', $pathinfo) ) {
    205                 $requested_path = $pathinfo;
    206             } else {
    207                 // If the request uri is the index, blank it out so that we don't try to match it against a rule.
    208                 if ( $req_uri == $wp_rewrite->index )
    209                     $req_uri = '';
    210                 $requested_path = $req_uri;
    211             }
    212             $requested_file = $req_uri;
    213 
    214             $this->request = $requested_path;
    215 
    216             // Look for matches.
    217             $request_match = $requested_path;
    218             if ( empty( $request_match ) ) {
    219                 // An empty request could only match against ^$ regex
    220                 if ( isset( $rewrite['$'] ) ) {
    221                     $this->matched_rule = '$';
    222                     $query = $rewrite['$'];
    223                     $matches = array('');
    224                 }
    225             } else {
    226                 foreach ( (array) $rewrite as $match => $query ) {
    227                     // If the requested file is the anchor of the match, prepend it to the path info.
    228                     if ( ! empty($requested_file) && strpos($match, $requested_file) === 0 && $requested_file != $requested_path )
    229                         $request_match = $requested_file . '/' . $requested_path;
    230 
    231                     if ( preg_match("#^$match#", $request_match, $matches) ||
    232                         preg_match("#^$match#", urldecode($request_match), $matches) ) {
    233 
    234                         if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {
    235                             // This is a verbose page match, let's check to be sure about it.
    236                             $page = get_page_by_path( $matches[ $varmatch[1] ] );
    237                             if ( ! $page ) {
    238                                 continue;
    239                             }
    240 
    241                             $post_status_obj = get_post_status_object( $page->post_status );
    242                             if ( ! $post_status_obj->public && ! $post_status_obj->protected
    243                                 && ! $post_status_obj->private && $post_status_obj->exclude_from_search ) {
    244                                 continue;
    245                             }
    246                         }
    247 
    248                         // Got a match.
    249                         $this->matched_rule = $match;
    250                         break;
    251                     }
    252                 }
    253             }
    254 
    255             if ( isset( $this->matched_rule ) ) {
    256                 // Trim the query of everything up to the '?'.
    257                 $query = preg_replace("!^.+\?!", '', $query);
    258 
    259                 // Substitute the substring matches into the query.
    260                 $query = addslashes(WP_MatchesMapRegex::apply($query, $matches));
    261 
    262                 $this->matched_query = $query;
    263 
    264                 // Parse the query.
    265                 parse_str($query, $perma_query_vars);
    266 
    267                 // If we're processing a 404 request, clear the error var since we found something.
    268                 if ( '404' == $error )
    269                     unset( $error, $_GET['error'] );
    270             }
    271 
    272             // If req_uri is empty or if it is a request for ourself, unset error.
    273             if ( empty($requested_path) || $requested_file == $self || strpos($_SERVER['PHP_SELF'], 'wp-admin/') !== false ) {
    274                 unset( $error, $_GET['error'] );
    275 
    276                 if ( isset($perma_query_vars) && strpos($_SERVER['PHP_SELF'], 'wp-admin/') !== false )
    277                     unset( $perma_query_vars );
    278 
    279                 $this->did_permalink = false;
    280             }
    281         }
    282 
    283         /**
    284          * Filters the query variables whitelist before processing.
    285          *
    286          * Allows (publicly allowed) query vars to be added, removed, or changed prior
    287          * to executing the query. Needed to allow custom rewrite rules using your own arguments
    288          * to work, or any other custom query variables you want to be publicly available.
    289          *
    290          * @since 1.5.0
    291          *
    292          * @param array $public_query_vars The array of whitelisted query variables.
    293          */
    294         $this->public_query_vars = apply_filters( 'query_vars', $this->public_query_vars );
    295 
    296         foreach ( get_post_types( array(), 'objects' ) as $post_type => $t ) {
    297             if ( is_post_type_viewable( $t ) && $t->query_var ) {
    298                 $post_type_query_vars[$t->query_var] = $post_type;
    299             }
    300         }
    301 
    302         foreach ( $this->public_query_vars as $wpvar ) {
    303             if ( isset( $this->extra_query_vars[$wpvar] ) )
    304                 $this->query_vars[$wpvar] = $this->extra_query_vars[$wpvar];
    305             elseif ( isset( $_POST[$wpvar] ) )
    306                 $this->query_vars[$wpvar] = $_POST[$wpvar];
    307             elseif ( isset( $_GET[$wpvar] ) )
    308                 $this->query_vars[$wpvar] = $_GET[$wpvar];
    309             elseif ( isset( $perma_query_vars[$wpvar] ) )
    310                 $this->query_vars[$wpvar] = $perma_query_vars[$wpvar];
    311 
    312             if ( !empty( $this->query_vars[$wpvar] ) ) {
    313                 if ( ! is_array( $this->query_vars[$wpvar] ) ) {
    314                     $this->query_vars[$wpvar] = (string) $this->query_vars[$wpvar];
    315                 } else {
    316                     foreach ( $this->query_vars[$wpvar] as $vkey => $v ) {
    317                         if ( !is_object( $v ) ) {
    318                             $this->query_vars[$wpvar][$vkey] = (string) $v;
    319                         }
    320                     }
    321                 }
    322 
    323                 if ( isset($post_type_query_vars[$wpvar] ) ) {
    324                     $this->query_vars['post_type'] = $post_type_query_vars[$wpvar];
    325                     $this->query_vars['name'] = $this->query_vars[$wpvar];
    326                 }
    327             }
    328         }
    329 
    330         // Convert urldecoded spaces back into +
    331         foreach ( get_taxonomies( array() , 'objects' ) as $taxonomy => $t )
    332             if ( $t->query_var && isset( $this->query_vars[$t->query_var] ) )
    333                 $this->query_vars[$t->query_var] = str_replace( ' ', '+', $this->query_vars[$t->query_var] );
    334 
    335         // Don't allow non-publicly queryable taxonomies to be queried from the front end.
    336         if ( ! is_admin() ) {
    337             foreach ( get_taxonomies( array( 'publicly_queryable' => false ), 'objects' ) as $taxonomy => $t ) {
    338                 /*
    339                  * Disallow when set to the 'taxonomy' query var.
    340                  * Non-publicly queryable taxonomies cannot register custom query vars. See register_taxonomy().
    341                  */
    342                 if ( isset( $this->query_vars['taxonomy'] ) && $taxonomy === $this->query_vars['taxonomy'] ) {
    343                     unset( $this->query_vars['taxonomy'], $this->query_vars['term'] );
    344                 }
    345             }
    346         }
    347 
    348         // Limit publicly queried post_types to those that are publicly_queryable
    349         if ( isset( $this->query_vars['post_type']) ) {
    350             $queryable_post_types = get_post_types( array('publicly_queryable' => true) );
    351             if ( ! is_array( $this->query_vars['post_type'] ) ) {
    352                 if ( ! in_array( $this->query_vars['post_type'], $queryable_post_types ) )
    353                     unset( $this->query_vars['post_type'] );
    354             } else {
    355                 $this->query_vars['post_type'] = array_intersect( $this->query_vars['post_type'], $queryable_post_types );
    356             }
    357         }
    358 
    359         // Resolve conflicts between posts with numeric slugs and date archive queries.
    360         $this->query_vars = wp_resolve_numeric_slug_conflicts( $this->query_vars );
    361 
    362         foreach ( (array) $this->private_query_vars as $var) {
    363             if ( isset($this->extra_query_vars[$var]) )
    364                 $this->query_vars[$var] = $this->extra_query_vars[$var];
    365         }
    366 
    367         if ( isset($error) )
    368             $this->query_vars['error'] = $error;
    369 
    370         /**
    371          * Filters the array of parsed query variables.
    372          *
    373          * @since 2.1.0
    374          *
    375          * @param array $query_vars The array of requested query variables.
    376          */
    377         $this->query_vars = apply_filters( 'request', $this->query_vars );
    378 
    379         /**
    380          * Fires once all query variables for the current request have been parsed.
    381          *
    382          * @since 2.1.0
    383          *
    384          * @param WP &$this Current WordPress environment instance (passed by reference).
    385          */
    386         do_action_ref_array( 'parse_request', array( &$this ) );
    387     }
    388 
    389     /**
    390      * Sends additional HTTP headers for caching, content type, etc.
    391      *
    392      * Sets the Content-Type header. Sets the 'error' status (if passed) and optionally exits.
    393      * If showing a feed, it will also send Last-Modified, ETag, and 304 status if needed.
    394      *
    395      * @since 2.0.0
    396      * @since 4.4.0 `X-Pingback` header is added conditionally after posts have been queried in handle_404().
    397      * @access public
    398      */
    399     public function send_headers() {
    400         $headers = array();
    401         $status = null;
    402         $exit_required = false;
    403 
    404         if ( is_user_logged_in() )
    405             $headers = array_merge($headers, wp_get_nocache_headers());
    406         if ( ! empty( $this->query_vars['error'] ) ) {
    407             $status = (int) $this->query_vars['error'];
    408             if ( 404 === $status ) {
    409                 if ( ! is_user_logged_in() )
    410                     $headers = array_merge($headers, wp_get_nocache_headers());
    411                 $headers['Content-Type'] = get_option('html_type') . '; charset=' . get_option('blog_charset');
    412             } elseif ( in_array( $status, array( 403, 500, 502, 503 ) ) ) {
    413                 $exit_required = true;
    414             }
    415         } elseif ( empty( $this->query_vars['feed'] ) ) {
    416             $headers['Content-Type'] = get_option('html_type') . '; charset=' . get_option('blog_charset');
    417         } else {
    418             // Set the correct content type for feeds
    419             $type = $this->query_vars['feed'];
    420             if ( 'feed' == $this->query_vars['feed'] ) {
    421                 $type = get_default_feed();
    422             }
    423             $headers['Content-Type'] = feed_content_type( $type ) . '; charset=' . get_option( 'blog_charset' );
    424 
    425             // We're showing a feed, so WP is indeed the only thing that last changed
    426             if ( !empty($this->query_vars['withcomments'])
    427                 || false !== strpos( $this->query_vars['feed'], 'comments-' )
    428                 || ( empty($this->query_vars['withoutcomments'])
    429                     && ( !empty($this->query_vars['p'])
    430                         || !empty($this->query_vars['name'])
    431                         || !empty($this->query_vars['page_id'])
    432                         || !empty($this->query_vars['pagename'])
    433                         || !empty($this->query_vars['attachment'])
    434                         || !empty($this->query_vars['attachment_id'])
    435                     )
    436                 )
    437             )
    438                 $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastcommentmodified('GMT'), 0).' GMT';
    439             else
    440                 $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT'), 0).' GMT';
    441             $wp_etag = '"' . md5($wp_last_modified) . '"';
    442             $headers['Last-Modified'] = $wp_last_modified;
    443             $headers['ETag'] = $wp_etag;
    444 
    445             // Support for Conditional GET
    446             if (isset($_SERVER['HTTP_IF_NONE_MATCH']))
    447                 $client_etag = wp_unslash( $_SERVER['HTTP_IF_NONE_MATCH'] );
    448             else $client_etag = false;
    449 
    450             $client_last_modified = empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? '' : trim($_SERVER['HTTP_IF_MODIFIED_SINCE']);
    451             // If string is empty, return 0. If not, attempt to parse into a timestamp
    452             $client_modified_timestamp = $client_last_modified ? strtotime($client_last_modified) : 0;
    453 
    454             // Make a timestamp for our most recent modification...
    455             $wp_modified_timestamp = strtotime($wp_last_modified);
    456 
    457             if ( ($client_last_modified && $client_etag) ?
    458                      (($client_modified_timestamp >= $wp_modified_timestamp) && ($client_etag == $wp_etag)) :
    459                      (($client_modified_timestamp >= $wp_modified_timestamp) || ($client_etag == $wp_etag)) ) {
    460                 $status = 304;
    461                 $exit_required = true;
    462             }
    463         }
    464 
    465         /**
    466          * Filters the HTTP headers before they're sent to the browser.
    467          *
    468          * @since 2.8.0
    469          *
    470          * @param array $headers The list of headers to be sent.
    471          * @param WP    $this    Current WordPress environment instance.
    472          */
    473         $headers = apply_filters( 'wp_headers', $headers, $this );
    474 
    475         if ( ! empty( $status ) )
    476             status_header( $status );
    477 
    478         // If Last-Modified is set to false, it should not be sent (no-cache situation).
    479         if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) {
    480             unset( $headers['Last-Modified'] );
    481 
    482             // In PHP 5.3+, make sure we are not sending a Last-Modified header.
    483             if ( function_exists( 'header_remove' ) ) {
    484                 @header_remove( 'Last-Modified' );
    485             } else {
    486                 // In PHP 5.2, send an empty Last-Modified header, but only as a
    487                 // last resort to override a header already sent. #WP23021
    488                 foreach ( headers_list() as $header ) {
    489                     if ( 0 === stripos( $header, 'Last-Modified' ) ) {
    490                         $headers['Last-Modified'] = '';
    491                         break;
    492                     }
    493                 }
    494             }
    495         }
    496 
    497         foreach ( (array) $headers as $name => $field_value )
    498             @header("{$name}: {$field_value}");
    499 
    500         if ( $exit_required )
    501             exit();
    502 
    503         /**
    504          * Fires once the requested HTTP headers for caching, content type, etc. have been sent.
    505          *
    506          * @since 2.1.0
    507          *
    508          * @param WP &$this Current WordPress environment instance (passed by reference).
    509          */
    510         do_action_ref_array( 'send_headers', array( &$this ) );
    511     }
    512 
    513     /**
    514      * Sets the query string property based off of the query variable property.
    515      *
    516      * The {@see 'query_string'} filter is deprecated, but still works. Plugins should
    517      * use the {@see 'request'} filter instead.
    518      *
    519      * @since 2.0.0
    520      * @access public
    521      */
    522     public function build_query_string() {
    523         $this->query_string = '';
    524         foreach ( (array) array_keys($this->query_vars) as $wpvar) {
    525             if ( '' != $this->query_vars[$wpvar] ) {
    526                 $this->query_string .= (strlen($this->query_string) < 1) ? '' : '&';
    527                 if ( !is_scalar($this->query_vars[$wpvar]) ) // Discard non-scalars.
    528                     continue;
    529                 $this->query_string .= $wpvar . '=' . rawurlencode($this->query_vars[$wpvar]);
    530             }
    531         }
    532 
    533         if ( has_filter( 'query_string' ) ) {  // Don't bother filtering and parsing if no plugins are hooked in.
    534             /**
    535              * Filters the query string before parsing.
    536              *
    537              * @since 1.5.0
    538              * @deprecated 2.1.0 Use 'query_vars' or 'request' filters instead.
    539              *
    540              * @param string $query_string The query string to modify.
    541              */
    542             $this->query_string = apply_filters( 'query_string', $this->query_string );
    543             parse_str($this->query_string, $this->query_vars);
    544         }
    545     }
    546 
    547     /**
    548      * Set up the WordPress Globals.
    549      *
    550      * The query_vars property will be extracted to the GLOBALS. So care should
    551      * be taken when naming global variables that might interfere with the
    552      * WordPress environment.
    553      *
    554      * @since 2.0.0
    555      * @access public
    556      *
    557      * @global WP_Query     $wp_query
    558      * @global string       $query_string Query string for the loop.
    559      * @global array        $posts The found posts.
    560      * @global WP_Post|null $post The current post, if available.
    561      * @global string       $request The SQL statement for the request.
    562      * @global int          $more Only set, if single page or post.
    563      * @global int          $single If single page or post. Only set, if single page or post.
    564      * @global WP_User      $authordata Only set, if author archive.
    565      */
    566     public function register_globals() {
    567         global $wp_query;
    568 
    569         // Extract updated query vars back into global namespace.
    570         foreach ( (array) $wp_query->query_vars as $key => $value ) {
    571             $GLOBALS[ $key ] = $value;
    572         }
    573 
    574         $GLOBALS['query_string'] = $this->query_string;
    575         $GLOBALS['posts'] = & $wp_query->posts;
    576         $GLOBALS['post'] = isset( $wp_query->post ) ? $wp_query->post : null;
    577         $GLOBALS['request'] = $wp_query->request;
    578 
    579         if ( $wp_query->is_single() || $wp_query->is_page() ) {
    580             $GLOBALS['more']   = 1;
    581             $GLOBALS['single'] = 1;
    582         }
    583 
    584         if ( $wp_query->is_author() && isset( $wp_query->post ) )
    585             $GLOBALS['authordata'] = get_userdata( $wp_query->post->post_author );
    586     }
    587 
    588     /**
    589      * Set up the current user.
    590      *
    591      * @since 2.0.0
    592      * @access public
    593      */
    594     public function init() {
    595         wp_get_current_user();
    596     }
    597 
    598     /**
    599      * Set up the Loop based on the query variables.
    600      *
    601      * @since 2.0.0
    602      * @access public
    603      *
    604      * @global WP_Query $wp_the_query
    605      */
    606     public function query_posts() {
    607         global $wp_the_query;
    608         $this->build_query_string();
    609         $wp_the_query->query($this->query_vars);
    610     }
    611 
    612     /**
    613      * Set the Headers for 404, if nothing is found for requested URL.
    614      *
    615      * Issue a 404 if a request doesn't match any posts and doesn't match
    616      * any object (e.g. an existing-but-empty category, tag, author) and a 404 was not already
    617      * issued, and if the request was not a search or the homepage.
    618      *
    619      * Otherwise, issue a 200.
    620      *
    621      * This sets headers after posts have been queried. handle_404() really means "handle status."
    622      * By inspecting the result of querying posts, seemingly successful requests can be switched to
    623      * a 404 so that canonical redirection logic can kick in.
    624      *
    625      * @since 2.0.0
    626      * @access public
    627      *
    628      * @global WP_Query $wp_query
    629      */
    630     public function handle_404() {
    631         global $wp_query;
    632 
    633         /**
    634          * Filters whether to short-circuit default header status handling.
    635          *
    636          * Returning a non-false value from the filter will short-circuit the handling
    637          * and return early.
    638          *
    639          * @since 4.5.0
    640          *
    641          * @param bool     $preempt  Whether to short-circuit default header status handling. Default false.
    642          * @param WP_Query $wp_query WordPress Query object.
    643          */
    644         if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) {
    645             return;
    646         }
    647 
    648         // If we've already issued a 404, bail.
    649         if ( is_404() )
    650             return;
    651 
    652         // Never 404 for the admin, robots, or if we found posts.
    653         if ( is_admin() || is_robots() || $wp_query->posts ) {
    654 
    655             $success = true;
    656             if ( is_singular() ) {
    657                 $p = false;
    658 
    659                 if ( $wp_query->post instanceof WP_Post ) {
    660                     $p = clone $wp_query->post;
    661                 }
    662 
    663                 // Only set X-Pingback for single posts that allow pings.
    664                 if ( $p && pings_open( $p ) ) {
    665                     @header( 'X-Pingback: ' . get_bloginfo( 'pingback_url' ) );
    666                 }
    667 
    668                 // check for paged content that exceeds the max number of pages
    669                 $next = '<!--nextpage-->';
    670                 if ( $p && false !== strpos( $p->post_content, $next ) && ! empty( $this->query_vars['page'] ) ) {
    671                     $page = trim( $this->query_vars['page'], '/' );
    672                     $success = (int) $page <= ( substr_count( $p->post_content, $next ) + 1 );
    673                 }
    674             }
    675 
    676             if ( $success ) {
    677                 status_header( 200 );
    678                 return;
    679             }
    680         }
    681 
    682         // We will 404 for paged queries, as no posts were found.
    683         if ( ! is_paged() ) {
    684 
    685             // Don't 404 for authors without posts as long as they matched an author on this site.
    686             $author = get_query_var( 'author' );
    687             if ( is_author() && is_numeric( $author ) && $author > 0 && is_user_member_of_blog( $author ) ) {
    688                 status_header( 200 );
    689                 return;
    690             }
    691 
    692             // Don't 404 for these queries if they matched an object.
    693             if ( ( is_tag() || is_category() || is_tax() || is_post_type_archive() ) && get_queried_object() ) {
    694                 status_header( 200 );
    695                 return;
    696             }
    697 
    698             // Don't 404 for these queries either.
    699             if ( is_home() || is_search() || is_feed() ) {
    700                 status_header( 200 );
    701                 return;
    702             }
    703         }
    704 
    705         // Guess it's time to 404.
    706         $wp_query->set_404();
    707         status_header( 404 );
    708         nocache_headers();
    709     }
    710 
    711     /**
    712      * Sets up all of the variables required by the WordPress environment.
    713      *
    714      * The action {@see 'wp'} has one parameter that references the WP object. It
    715      * allows for accessing the properties and methods to further manipulate the
    716      * object.
    717      *
    718      * @since 2.0.0
    719      * @access public
    720      *
    721      * @param string|array $query_args Passed to parse_request().
    722      */
    723     public function main($query_args = '') {
    724         $this->init();
    725         $this->parse_request($query_args);
    726         $this->send_headers();
    727         $this->query_posts();
    728         $this->handle_404();
    729         $this->register_globals();
    730 
    731         /**
    732          * Fires once the WordPress environment has been set up.
    733          *
    734          * @since 2.1.0
    735          *
    736          * @param WP &$this Current WordPress environment instance (passed by reference).
    737          */
    738         do_action_ref_array( 'wp', array( &$this ) );
    739     }
    740 }
    7418
    7429/**
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