Ticket #29615: link-template.php

<?php
/**
 * WordPress Link Template Functions
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Display the permalink for the current post.
 *
 * @since 1.2.0
 */
function the_permalink() {
        /**
         * Filter the display of the permalink for the current post.
         *
         * @since 1.5.0
         *
         * @param string $permalink The permalink for the current post.
         */
        echo esc_url( apply_filters( 'the_permalink', get_permalink() ) );
}

/**
 * Retrieve trailing slash string, if blog set for adding trailing slashes.
 *
 * Conditionally adds a trailing slash if the permalink structure has a trailing
 * slash, strips the trailing slash if not. The string is passed through the
 * 'user_trailingslashit' filter. Will remove trailing slash from string, if
 * blog is not set to have them.
 *
 * @since 2.2.0
 * @uses $wp_rewrite
 *
 * @param string $string URL with or without a trailing slash.
 * @param string $type_of_url The type of URL being considered (e.g. single, category, etc) for use in the filter.
 * @return string
 */
function user_trailingslashit($string, $type_of_url = '') {
        global $wp_rewrite;
        if ( $wp_rewrite->use_trailing_slashes )
                $string = trailingslashit($string);
        else
                $string = untrailingslashit($string);

        /**
         * Filter the trailing slashed string, depending on whether the site is set
         * to use training slashes.
         *
         * @since 2.2.0
         *
         * @param string $string      URL with or without a trailing slash.
         * @param string $type_of_url The type of URL being considered. Accepts 'single', 'single_trackback',
         *                            'single_feed', 'single_paged', 'feed', 'category', 'page', 'year',
         *                            'month', 'day', 'paged', 'post_type_archive'.
         */
        $string = apply_filters( 'user_trailingslashit', $string, $type_of_url );
        return $string;
}

/**
 * Display permalink anchor for current post.
 *
 * The permalink mode title will use the post title for the 'a' element 'id'
 * attribute. The id mode uses 'post-' with the post ID for the 'id' attribute.
 *
 * @since 0.71
 *
 * @param string $mode Permalink mode can be either 'title', 'id', or default, which is 'id'.
 */
function permalink_anchor( $mode = 'id' ) {
        $post = get_post();
        switch ( strtolower( $mode ) ) {
                case 'title':
                        $title = sanitize_title( $post->post_title ) . '-' . $post->ID;
                        echo '<a id="'.$title.'"></a>';
                        break;
                case 'id':
                default:
                        echo '<a id="post-' . $post->ID . '"></a>';
                        break;
        }
}

/**
 * Retrieve full permalink for current post or post ID.
 *
 * This function is an alias for get_permalink().
 *
 * @since 3.9.0
 *
 * @see get_permalink()
 *
 * @param int|WP_Post $id        Optional. Post ID or post object. Default is the current post.
 * @param bool        $leavename Optional. Whether to keep post name or page name. Default false.
 * @return string|bool The permalink URL or false if post does not exist.
 */
function get_the_permalink( $id = 0, $leavename = false ) {
        return get_permalink( $id, $leavename );
}

/**
 * Retrieve full permalink for current post or post ID.
 *
 * @since 1.0.0
 *
 * @param int|WP_Post $id        Optional. Post ID or post object. Default current post.
 * @param bool        $leavename Optional. Whether to keep post name or page name. Default false.
 * @return string|bool The permalink URL or false if post does not exist.
 */
function get_permalink( $id = 0, $leavename = false ) {
        $rewritecode = array(
                '%year%',
                '%monthnum%',
                '%day%',
                '%hour%',
                '%minute%',
                '%second%',
                $leavename? '' : '%postname%',
                '%post_id%',
                '%category%',
                '%author%',
                $leavename? '' : '%pagename%',
        );

        if ( is_object($id) && isset($id->filter) && 'sample' == $id->filter ) {
                $post = $id;
                $sample = true;
        } else {
                $post = get_post($id);
                $sample = false;
        }

        if ( empty($post->ID) )
                return false;

        if ( $post->post_type == 'page' )
                return get_page_link($post, $leavename, $sample);
        elseif ( $post->post_type == 'attachment' )
                return get_attachment_link( $post, $leavename );
        elseif ( in_array($post->post_type, get_post_types( array('_builtin' => false) ) ) )
                return get_post_permalink($post, $leavename, $sample);

        $permalink = get_option('permalink_structure');

        /**
         * Filter the permalink structure for a post before token replacement occurs.
         *
         * Only applies to posts with post_type of 'post'.
         *
         * @since 3.0.0
         *
         * @param string  $permalink The site's permalink structure.
         * @param WP_Post $post      The post in question.
         * @param bool    $leavename Whether to keep the post name.
         */
        $permalink = apply_filters( 'pre_post_link', $permalink, $post, $leavename );

        if ( '' != $permalink && !in_array($post->post_status, array('draft', 'pending', 'auto-draft')) ) {
                $unixtime = strtotime($post->post_date);

                $category = '';
                if ( strpos($permalink, '%category%') !== false ) {
                        $cats = get_the_category($post->ID);
                        if ( $cats ) {
                                usort($cats, '_usort_terms_by_ID'); // order by ID

                                /**
                                 * Filter the category that gets used in the %category% permalink token.
                                 *
                                 * @since 3.5.0
                                 *
                                 * @param stdClass $cat  The category to use in the permalink.
                                 * @param array    $cats Array of all categories associated with the post.
                                 * @param WP_Post  $post The post in question.
                                 */
                                $category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post );

                                $category_object = get_term( $category_object, 'category' );
                                $category = $category_object->slug;
                                if ( $parent = $category_object->parent )
                                        $category = get_category_parents($parent, false, '/', true) . $category;
                        }
                        // show default category in permalinks, without
                        // having to assign it explicitly
                        if ( empty($category) ) {
                                $default_category = get_term( get_option( 'default_category' ), 'category' );
                                $category = is_wp_error( $default_category ) ? '' : $default_category->slug;
                        }
                }

                $author = '';
                if ( strpos($permalink, '%author%') !== false ) {
                        $authordata = get_userdata($post->post_author);
                        $author = $authordata->user_nicename;
                }

                $date = explode(" ",date('Y m d H i s', $unixtime));
                $rewritereplace =
                array(
                        $date[0],
                        $date[1],
                        $date[2],
                        $date[3],
                        $date[4],
                        $date[5],
                        $post->post_name,
                        $post->ID,
                        $category,
                        $author,
                        $post->post_name,
                );
                $permalink = home_url( str_replace($rewritecode, $rewritereplace, $permalink) );
                $permalink = user_trailingslashit($permalink, 'single');
        } else { // if they're not using the fancy permalink option
                $permalink = home_url('?p=' . $post->ID);
        }

        /**
         * Filter the permalink for a post.
         *
         * Only applies to posts with post_type of 'post'.
         *
         * @since 1.5.0
         *
         * @param string  $permalink The post's permalink.
         * @param WP_Post $post      The post in question.
         * @param bool    $leavename Whether to keep the post name.
         */
        return apply_filters( 'post_link', $permalink, $post, $leavename );
}

/**
 * Retrieve the permalink for a post with a custom post type.
 *
 * @since 3.0.0
 *
 * @param int $id Optional. Post ID.
 * @param bool $leavename Optional, defaults to false. Whether to keep post name.
 * @param bool $sample Optional, defaults to false. Is it a sample permalink.
 * @return string
 */
function get_post_permalink( $id = 0, $leavename = false, $sample = false ) {
        global $wp_rewrite;

        $post = get_post($id);

        if ( is_wp_error( $post ) )
                return $post;

        $post_link = $wp_rewrite->get_extra_permastruct($post->post_type);

        $slug = $post->post_name;

        $draft_or_pending = isset($post->post_status) && in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ) );

        $post_type = get_post_type_object($post->post_type);

        if ( $post_type->hierarchical )
                $slug = get_page_uri($id);

        if ( !empty($post_link) && ( !$draft_or_pending || $sample ) ) {
                if ( ! $leavename )
                        $post_link = str_replace("%$post->post_type%", $slug, $post_link);
                $post_link = home_url( user_trailingslashit($post_link) );
        } else {
                if ( $post_type->query_var && ( isset($post->post_status) && !$draft_or_pending ) )
                        $post_link = add_query_arg($post_type->query_var, $slug, '');
                else
                        $post_link = add_query_arg(array('post_type' => $post->post_type, 'p' => $post->ID), '');
                $post_link = home_url($post_link);
        }

        /**
         * Filter the permalink for a post with a custom post type.
         *
         * @since 3.0.0
         *
         * @param string  $post_link The post's permalink.
         * @param WP_Post $post      The post in question.
         * @param bool    $leavename Whether to keep the post name.
         * @param bool    $sample    Is it a sample permalink.
         */
        return apply_filters( 'post_type_link', $post_link, $post, $leavename, $sample );
}

/**
 * Retrieve permalink from post ID.
 *
 * @since 1.0.0
 *
 * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global $post.
 * @param mixed $deprecated Not used.
 * @return string
 */
function post_permalink( $post_id = 0, $deprecated = '' ) {
        if ( !empty( $deprecated ) )
                _deprecated_argument( __FUNCTION__, '1.3' );

        return get_permalink($post_id);
}

/**
 * Retrieve the permalink for current page or page ID.
 *
 * Respects page_on_front. Use this one.
 *
 * @since 1.5.0
 *
 * @param int|object $post Optional. Post ID or object.
 * @param bool $leavename Optional, defaults to false. Whether to keep page name.
 * @param bool $sample Optional, defaults to false. Is it a sample permalink.
 * @return string
 */
function get_page_link( $post = false, $leavename = false, $sample = false ) {
        $post = get_post( $post );

        if ( 'page' == get_option( 'show_on_front' ) && $post->ID == get_option( 'page_on_front' ) )
                $link = home_url('/');
        else
                $link = _get_page_link( $post, $leavename, $sample );

        /**
         * Filter the permalink for a page.
         *
         * @since 1.5.0
         *
         * @param string $link    The page's permalink.
         * @param int    $post_id The ID of the page.
         * @param bool   $sample  Is it a sample permalink.
         */
        return apply_filters( 'page_link', $link, $post->ID, $sample );
}

/**
 * Retrieve the page permalink.
 *
 * Ignores page_on_front. Internal use only.
 *
 * @since 2.1.0
 * @access private
 *
 * @param int|object $post Optional. Post ID or object.
 * @param bool $leavename Optional. Leave name.
 * @param bool $sample Optional. Sample permalink.
 * @return string
 */
function _get_page_link( $post = false, $leavename = false, $sample = false ) {
        global $wp_rewrite;

        $post = get_post( $post );

        $draft_or_pending = in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ) );

        $link = $wp_rewrite->get_page_permastruct();

        if ( !empty($link) && ( ( isset($post->post_status) && !$draft_or_pending ) || $sample ) ) {
                if ( ! $leavename ) {
                        $link = str_replace('%pagename%', get_page_uri( $post ), $link);
                }

                $link = home_url($link);
                $link = user_trailingslashit($link, 'page');
        } else {
                $link = home_url( '?page_id=' . $post->ID );
        }

        /**
         * Filter the permalink for a non-page_on_front page.
         *
         * @since 2.1.0
         *
         * @param string $link    The page's permalink.
         * @param int    $post_id The ID of the page.
         */
        return apply_filters( '_get_page_link', $link, $post->ID );
}

/**
 * Retrieve permalink for attachment.
 *
 * This can be used in the WordPress Loop or outside of it.
 *
 * @since 2.0.0
 *
 * @param int|object $post Optional. Post ID or object.
 * @param bool $leavename Optional. Leave name.
 * @return string
 */
function get_attachment_link( $post = null, $leavename = false ) {
        global $wp_rewrite;

        $link = false;

        $post = get_post( $post );
        $parent = ( $post->post_parent > 0 && $post->post_parent != $post->ID ) ? get_post( $post->post_parent ) : false;

        if ( $wp_rewrite->using_permalinks() && $parent ) {
                if ( 'page' == $parent->post_type )
                        $parentlink = _get_page_link( $post->post_parent ); // Ignores page_on_front
                else
                        $parentlink = get_permalink( $post->post_parent );

                if ( is_numeric($post->post_name) || false !== strpos(get_option('permalink_structure'), '%category%') )
                        $name = 'attachment/' . $post->post_name; // <permalink>/<int>/ is paged so we use the explicit attachment marker
                else
                        $name = $post->post_name;

                if ( strpos($parentlink, '?') === false )
                        $link = user_trailingslashit( trailingslashit($parentlink) . '%postname%' );

                if ( ! $leavename )
                        $link = str_replace( '%postname%', $name, $link );
        }

        if ( ! $link )
                $link = home_url( '/?attachment_id=' . $post->ID );

        /**
         * Filter the permalink for an attachment.
         *
         * @since 2.0.0
         *
         * @param string $link    The attachment's permalink.
         * @param int    $post_id Attachment ID.
         */
        return apply_filters( 'attachment_link', $link, $post->ID );
}

/**
 * Retrieve the permalink for the year archives.
 *
 * @since 1.5.0
 *
 * @param int|bool $year False for current year or year for permalink.
 * @return string
 */
function get_year_link($year) {
        global $wp_rewrite;
        if ( !$year )
                $year = gmdate('Y', current_time('timestamp'));
        $yearlink = $wp_rewrite->get_year_permastruct();
        if ( !empty($yearlink) ) {
                $yearlink = str_replace('%year%', $year, $yearlink);
                $yearlink = home_url( user_trailingslashit( $yearlink, 'year' ) );
        } else {
                $yearlink = home_url( '?m=' . $year );
        }

        /**
         * Filter the year archive permalink.
         *
         * @since 1.5.0
         *
         * @param string $yearlink Permalink for the year archive.
         * @param int    $year     Year for the archive.
         */
        return apply_filters( 'year_link', $yearlink, $year );
}

/**
 * Retrieve the permalink for the month archives with year.
 *
 * @since 1.0.0
 *
 * @param bool|int $year False for current year. Integer of year.
 * @param bool|int $month False for current month. Integer of month.
 * @return string
 */
function get_month_link($year, $month) {
        global $wp_rewrite;
        if ( !$year )
                $year = gmdate('Y', current_time('timestamp'));
        if ( !$month )
                $month = gmdate('m', current_time('timestamp'));
        $monthlink = $wp_rewrite->get_month_permastruct();
        if ( !empty($monthlink) ) {
                $monthlink = str_replace('%year%', $year, $monthlink);
                $monthlink = str_replace('%monthnum%', zeroise(intval($month), 2), $monthlink);
                $monthlink = home_url( user_trailingslashit( $monthlink, 'month' ) );
        } else {
                $monthlink = home_url( '?m=' . $year . zeroise( $month, 2 ) );
        }

        /**
         * Filter the month archive permalink.
         *
         * @since 1.5.0
         *
         * @param string $monthlink Permalink for the month archive.
         * @param int    $year      Year for the archive.
         * @param int    $month     The month for the archive.
         */
        return apply_filters( 'month_link', $monthlink, $year, $month );
}

/**
 * Retrieve the permalink for the day archives with year and month.
 *
 * @since 1.0.0
 *
 * @param bool|int $year False for current year. Integer of year.
 * @param bool|int $month False for current month. Integer of month.
 * @param bool|int $day False for current day. Integer of day.
 * @return string
 */
function get_day_link($year, $month, $day) {
        global $wp_rewrite;
        if ( !$year )
                $year = gmdate('Y', current_time('timestamp'));
        if ( !$month )
                $month = gmdate('m', current_time('timestamp'));
        if ( !$day )
                $day = gmdate('j', current_time('timestamp'));

        $daylink = $wp_rewrite->get_day_permastruct();
        if ( !empty($daylink) ) {
                $daylink = str_replace('%year%', $year, $daylink);
                $daylink = str_replace('%monthnum%', zeroise(intval($month), 2), $daylink);
                $daylink = str_replace('%day%', zeroise(intval($day), 2), $daylink);
                $daylink = home_url( user_trailingslashit( $daylink, 'day' ) );
        } else {
                $daylink = home_url( '?m=' . $year . zeroise( $month, 2 ) . zeroise( $day, 2 ) );
        }

        /**
         * Filter the day archive permalink.
         *
         * @since 1.5.0
         *
         * @param string $daylink Permalink for the day archive.
         * @param int    $year    Year for the archive.
         * @param int    $month   Month for the archive.
         * @param int    $day     The day for the archive.
         */
        return apply_filters( 'day_link', $daylink, $year, $month, $day );
}

/**
 * Display the permalink for the feed type.
 *
 * @since 3.0.0
 *
 * @param string $anchor The link's anchor text.
 * @param string $feed Optional, defaults to default feed. Feed type.
 */
function the_feed_link( $anchor, $feed = '' ) {
        $link = '<a href="' . esc_url( get_feed_link( $feed ) ) . '">' . $anchor . '</a>';

        /**
         * Filter the feed link anchor tag.
         *
         * @since 3.0.0
         *
         * @param string $link The complete anchor tag for a feed link.
         * @param string $feed The feed type, or an empty string for the
         *                     default feed type.
         */
        echo apply_filters( 'the_feed_link', $link, $feed );
}

/**
 * Retrieve the permalink for the feed type.
 *
 * @since 1.5.0
 *
 * @param string $feed Optional, defaults to default feed. Feed type.
 * @return string
 */
function get_feed_link($feed = '') {
        global $wp_rewrite;

        $permalink = $wp_rewrite->get_feed_permastruct();
        if ( '' != $permalink ) {
                if ( false !== strpos($feed, 'comments_') ) {
                        $feed = str_replace('comments_', '', $feed);
                        $permalink = $wp_rewrite->get_comment_feed_permastruct();
                }

                if ( get_default_feed() == $feed )
                        $feed = '';

                $permalink = str_replace('%feed%', $feed, $permalink);
                $permalink = preg_replace('#/+#', '/', "/$permalink");
                $output =  home_url( user_trailingslashit($permalink, 'feed') );
        } else {
                if ( empty($feed) )
                        $feed = get_default_feed();

                if ( false !== strpos($feed, 'comments_') )
                        $feed = str_replace('comments_', 'comments-', $feed);

                $output = home_url("?feed={$feed}");
        }

        /**
         * Filter the feed type permalink.
         *
         * @since 1.5.0
         *
         * @param string $output The feed permalink.
         * @param string $feed   Feed type.
         */
        return apply_filters( 'feed_link', $output, $feed );
}

/**
 * Retrieve the permalink for the post comments feed.
 *
 * @since 2.2.0
 *
 * @param int $post_id Optional. Post ID.
 * @param string $feed Optional. Feed type.
 * @return string
 */
function get_post_comments_feed_link($post_id = 0, $feed = '') {
        $post_id = absint( $post_id );

        if ( ! $post_id )
                $post_id = get_the_ID();

        if ( empty( $feed ) )
                $feed = get_default_feed();

        if ( '' != get_option('permalink_structure') ) {
                if ( 'page' == get_option('show_on_front') && $post_id == get_option('page_on_front') )
                        $url = _get_page_link( $post_id );
                else
                        $url = get_permalink($post_id);

                $url = trailingslashit($url) . 'feed';
                if ( $feed != get_default_feed() )
                        $url .= "/$feed";
                $url = user_trailingslashit($url, 'single_feed');
        } else {
                $type = get_post_field('post_type', $post_id);
                if ( 'page' == $type )
                        $url = add_query_arg( array( 'feed' => $feed, 'page_id' => $post_id ), home_url( '/' ) );
                else
                        $url = add_query_arg( array( 'feed' => $feed, 'p' => $post_id ), home_url( '/' ) );
        }

        /**
         * Filter the post comments feed permalink.
         *
         * @since 1.5.1
         *
         * @param string $url Post comments feed permalink.
         */
        return apply_filters( 'post_comments_feed_link', $url );
}

/**
 * Display the comment feed link for a post.
 *
 * Prints out the comment feed link for a post. Link text is placed in the
 * anchor. If no link text is specified, default text is used. If no post ID is
 * specified, the current post is used.
 *
 * @since 2.5.0
 *
 * @param string $link_text Descriptive text.
 * @param int $post_id Optional post ID. Default to current post.
 * @param string $feed Optional. Feed format.
 * @return string Link to the comment feed for the current post.
*/
function post_comments_feed_link( $link_text = '', $post_id = '', $feed = '' ) {
        $url = esc_url( get_post_comments_feed_link( $post_id, $feed ) );
        if ( empty($link_text) )
                $link_text = __('Comments Feed');

        /**
         * Filter the post comment feed link anchor tag.
         *
         * @since 2.8.0
         *
         * @param string $link    The complete anchor tag for the comment feed link.
         * @param int    $post_id Post ID.
         * @param string $feed    The feed type, or an empty string for the default feed type.
         */
        echo apply_filters( 'post_comments_feed_link_html', "<a href='$url'>$link_text</a>", $post_id, $feed );
}

/**
 * Retrieve the feed link for a given author.
 *
 * Returns a link to the feed for all posts by a given author. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 2.5.0
 *
 * @param int $author_id ID of an author.
 * @param string $feed Optional. Feed type.
 * @return string Link to the feed for the author specified by $author_id.
*/
function get_author_feed_link( $author_id, $feed = '' ) {
        $author_id = (int) $author_id;
        $permalink_structure = get_option('permalink_structure');

        if ( empty($feed) )
                $feed = get_default_feed();

        if ( '' == $permalink_structure ) {
                $link = home_url("?feed=$feed&amp;author=" . $author_id);
        } else {
                $link = get_author_posts_url($author_id);
                if ( $feed == get_default_feed() )
                        $feed_link = 'feed';
                else
                        $feed_link = "feed/$feed";

                $link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
        }

        /**
         * Filter the feed link for a given author.
         *
         * @since 1.5.1
         *
         * @param string $link The author feed link.
         * @param string $feed Feed type.
         */
        $link = apply_filters( 'author_feed_link', $link, $feed );

        return $link;
}

/**
 * Retrieve the feed link for a category.
 *
 * Returns a link to the feed for all posts in a given category. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 2.5.0
 *
 * @param int $cat_id ID of a category.
 * @param string $feed Optional. Feed type.
 * @return string Link to the feed for the category specified by $cat_id.
*/
function get_category_feed_link($cat_id, $feed = '') {
        return get_term_feed_link($cat_id, 'category', $feed);
}

/**
 * Retrieve the feed link for a term.
 *
 * Returns a link to the feed for all posts in a given term. A specific feed
 * can be requested or left blank to get the default feed.
 *
 * @since 3.0.0
 *
 * @param int $term_id ID of a category.
 * @param string $taxonomy Optional. Taxonomy of $term_id
 * @param string $feed Optional. Feed type.
 * @return string Link to the feed for the term specified by $term_id and $taxonomy.
*/
function get_term_feed_link( $term_id, $taxonomy = 'category', $feed = '' ) {
        $term_id = ( int ) $term_id;

        $term = get_term( $term_id, $taxonomy  );

        if ( empty( $term ) || is_wp_error( $term ) )
                return false;

        if ( empty( $feed ) )
                $feed = get_default_feed();

        $permalink_structure = get_option( 'permalink_structure' );

        if ( '' == $permalink_structure ) {
                if ( 'category' == $taxonomy ) {
                        $link = home_url("?feed=$feed&amp;cat=$term_id");
                }
                elseif ( 'post_tag' == $taxonomy ) {
                        $link = home_url("?feed=$feed&amp;tag=$term->slug");
                } else {
                        $t = get_taxonomy( $taxonomy );
                        $link = home_url("?feed=$feed&amp;$t->query_var=$term->slug");
                }
        } else {
                $link = get_term_link( $term_id, $term->taxonomy );
                if ( $feed == get_default_feed() )
                        $feed_link = 'feed';
                else
                        $feed_link = "feed/$feed";

                $link = trailingslashit( $link ) . user_trailingslashit( $feed_link, 'feed' );
        }

        if ( 'category' == $taxonomy ) {
                /**
                 * Filter the category feed link.
                 *
                 * @since 1.5.1
                 *
                 * @param string $link The category feed link.
                 * @param string $feed Feed type.
                 */
                $link = apply_filters( 'category_feed_link', $link, $feed );
        } elseif ( 'post_tag' == $taxonomy ) {
                /**
                 * Filter the post tag feed link.
                 *
                 * @since 2.3.0
                 *
                 * @param string $link The tag feed link.
                 * @param string $feed Feed type.
                 */
                $link = apply_filters( 'tag_feed_link', $link, $feed );
        } else {
                /**
                 * Filter the feed link for a taxonomy other than 'category' or 'post_tag'.
                 *
                 * @since 3.0.0
                 *
                 * @param string $link The taxonomy feed link.
                 * @param string $feed Feed type.
                 * @param string $feed The taxonomy name.
                 */
                $link = apply_filters( 'taxonomy_feed_link', $link, $feed, $taxonomy );
        }

        return $link;
}

/**
 * Retrieve permalink for feed of tag.
 *
 * @since 2.3.0
 *
 * @param int $tag_id Tag ID.
 * @param string $feed Optional. Feed type.
 * @return string
 */
function get_tag_feed_link($tag_id, $feed = '') {
        return get_term_feed_link($tag_id, 'post_tag', $feed);
}

/**
 * Retrieve edit tag link.
 *
 * @since 2.7.0
 *
 * @param int $tag_id Tag ID
 * @param string $taxonomy Taxonomy
 * @return string
 */
function get_edit_tag_link( $tag_id, $taxonomy = 'post_tag' ) {
        /**
         * Filter the edit link for a tag (or term in another taxonomy).
         *
         * @since 2.7.0
         *
         * @param string $link The term edit link.
         */
        return apply_filters( 'get_edit_tag_link', get_edit_term_link( $tag_id, $taxonomy ) );
}

/**
 * Display or retrieve edit tag link with formatting.
 *
 * @since 2.7.0
 *
 * @param string $link Optional. Anchor text.
 * @param string $before Optional. Display before edit link.
 * @param string $after Optional. Display after edit link.
 * @param object $tag Tag object.
 * @return string HTML content.
 */
function edit_tag_link( $link = '', $before = '', $after = '', $tag = null ) {
        $link = edit_term_link( $link, '', '', $tag, false );

        /**
         * Filter the anchor tag for the edit link for a tag (or term in another taxonomy).
         *
         * @since 2.7.0
         *
         * @param string $link The anchor tag for the edit link.
         */
        echo $before . apply_filters( 'edit_tag_link', $link ) . $after;
}

/**
 * Retrieve edit term url.
 *
 * @since 3.1.0
 *
 * @param int $term_id Term ID
 * @param string $taxonomy Taxonomy
 * @param string $object_type The object type
 * @return string
 */
function get_edit_term_link( $term_id, $taxonomy, $object_type = '' ) {
        $tax = get_taxonomy( $taxonomy );
        if ( !current_user_can( $tax->cap->edit_terms ) )
                return;

        $term = get_term( $term_id, $taxonomy );

        $args = array(
                'action' => 'edit',
                'taxonomy' => $taxonomy,
                'tag_ID' => $term->term_id,
        );

        if ( $object_type )
                $args['post_type'] = $object_type;

        $location = add_query_arg( $args, admin_url( 'edit-tags.php' ) );

        /**
         * Filter the edit link for a term.
         *
         * @since 3.1.0
         *
         * @param string $location    The edit link.
         * @param int    $term_id     Term ID.
         * @param string $taxonomy    Taxonomy name.
         * @param string $object_type The object type (eg. the post type).
         */
        return apply_filters( 'get_edit_term_link', $location, $term_id, $taxonomy, $object_type );
}

/**
 * Display or retrieve edit term link with formatting.
 *
 * @since 3.1.0
 *
 * @param string $link Optional. Anchor text.
 * @param string $before Optional. Display before edit link.
 * @param string $after Optional. Display after edit link.
 * @param object $term Term object.
 * @return string HTML content.
 */
function edit_term_link( $link = '', $before = '', $after = '', $term = null, $echo = true ) {
        if ( is_null( $term ) )
                $term = get_queried_object();

        if ( ! $term )
                return;

        $tax = get_taxonomy( $term->taxonomy );
        if ( ! current_user_can( $tax->cap->edit_terms ) )
                return;

        if ( empty( $link ) )
                $link = __('Edit This');

        $link = '<a href="' . get_edit_term_link( $term->term_id, $term->taxonomy ) . '">' . $link . '</a>';

        /**
         * Filter the anchor tag for the edit link of a term.
         *
         * @since 3.1.0
         *
         * @param string $link    The anchor tag for the edit link.
         * @param int    $term_id Term ID.
         */
        $link = $before . apply_filters( 'edit_term_link', $link, $term->term_id ) . $after;

        if ( $echo )
                echo $link;
        else
                return $link;
}

/**
 * Retrieve permalink for search.
 *
 * @since  3.0.0
 *
 * @param string $query Optional. The query string to use. If empty the current query is used.
 * @return string
 */
function get_search_link( $query = '' ) {
        global $wp_rewrite;

        if ( empty($query) )
                $search = get_search_query( false );
        else
                $search = stripslashes($query);

        $permastruct = $wp_rewrite->get_search_permastruct();

        if ( empty( $permastruct ) ) {
                $link = home_url('?s=' . urlencode($search) );
        } else {
                $search = urlencode($search);
                $search = str_replace('%2F', '/', $search); // %2F(/) is not valid within a URL, send it unencoded.
                $link = str_replace( '%search%', $search, $permastruct );
                $link = home_url( user_trailingslashit( $link, 'search' ) );
        }

        /**
         * Filter the search permalink.
         *
         * @since 3.0.0
         *
         * @param string $link   Search permalink.
         * @param string $search The URL-encoded search term.
         */
        return apply_filters( 'search_link', $link, $search );
}

/**
 * Retrieve the permalink for the feed of the search results.
 *
 * @since 2.5.0
 *
 * @param string $search_query Optional. Search query.
 * @param string $feed Optional. Feed type.
 * @return string
 */
function get_search_feed_link($search_query = '', $feed = '') {
        global $wp_rewrite;
        $link = get_search_link($search_query);

        if ( empty($feed) )
                $feed = get_default_feed();

        $permastruct = $wp_rewrite->get_search_permastruct();

        if ( empty($permastruct) ) {
                $link = add_query_arg('feed', $feed, $link);
        } else {
                $link = trailingslashit($link);
                $link .= "feed/$feed/";
        }

        /**
         * Filter the search feed link.
         *
         * @since 2.5.0
         *
         * @param string $link Search feed link.
         * @param string $feed Feed type.
         * @param string $type The search type. One of 'posts' or 'comments'.
         */
        $link = apply_filters( 'search_feed_link', $link, $feed, 'posts' );

        return $link;
}

/**
 * Retrieve the permalink for the comments feed of the search results.
 *
 * @since 2.5.0
 *
 * @param string $search_query Optional. Search query.
 * @param string $feed Optional. Feed type.
 * @return string
 */
function get_search_comments_feed_link($search_query = '', $feed = '') {
        global $wp_rewrite;

        if ( empty($feed) )
                $feed = get_default_feed();

        $link = get_search_feed_link($search_query, $feed);

        $permastruct = $wp_rewrite->get_search_permastruct();

        if ( empty($permastruct) )
                $link = add_query_arg('feed', 'comments-' . $feed, $link);
        else
                $link = add_query_arg('withcomments', 1, $link);

        /** This filter is documented in wp-includes/link-template.php */
        $link = apply_filters('search_feed_link', $link, $feed, 'comments');

        return $link;
}

/**
 * Retrieve the permalink for a post type archive.
 *
 * @since 3.1.0
 *
 * @param string $post_type Post type
 * @return string
 */
function get_post_type_archive_link( $post_type ) {
        global $wp_rewrite;
        if ( ! $post_type_obj = get_post_type_object( $post_type ) )
                return false;

        if ( ! $post_type_obj->has_archive )
                return false;

        if ( get_option( 'permalink_structure' ) && is_array( $post_type_obj->rewrite ) ) {
                $struct = ( true === $post_type_obj->has_archive ) ? $post_type_obj->rewrite['slug'] : $post_type_obj->has_archive;
                if ( $post_type_obj->rewrite['with_front'] )
                        $struct = $wp_rewrite->front . $struct;
                else
                        $struct = $wp_rewrite->root . $struct;
                $link = home_url( user_trailingslashit( $struct, 'post_type_archive' ) );
        } else {
                $link = home_url( '?post_type=' . $post_type );
        }

        /**
         * Filter the post type archive permalink.
         *
         * @since 3.1.0
         *
         * @param string $link      The post type archive permalink.
         * @param string $post_type Post type name.
         */
        return apply_filters( 'post_type_archive_link', $link, $post_type );
}

/**
 * Retrieve the permalink for a post type archive feed.
 *
 * @since 3.1.0
 *
 * @param string $post_type Post type
 * @param string $feed Optional. Feed type
 * @return string
 */
function get_post_type_archive_feed_link( $post_type, $feed = '' ) {
        $default_feed = get_default_feed();
        if ( empty( $feed ) )
                $feed = $default_feed;

        if ( ! $link = get_post_type_archive_link( $post_type ) )
                return false;

        $post_type_obj = get_post_type_object( $post_type );
        if ( get_option( 'permalink_structure' ) && is_array( $post_type_obj->rewrite ) && $post_type_obj->rewrite['feeds'] ) {
                $link = trailingslashit( $link );
                $link .= 'feed/';
                if ( $feed != $default_feed )
                        $link .= "$feed/";
        } else {
                $link = add_query_arg( 'feed', $feed, $link );
        }

        /**
         * Filter the post type archive feed link.
         *
         * @since 3.1.0
         *
         * @param string $link The post type archive feed link.
         * @param string $feed Feed type.
         */
        return apply_filters( 'post_type_archive_feed_link', $link, $feed );
}

/**
 * Retrieve edit posts link for post.
 *
 * Can be used within the WordPress loop or outside of it. Can be used with
 * pages, posts, attachments, and revisions.
 *
 * @since 2.3.0
 *
 * @param int $id Optional. Post ID.
 * @param string $context Optional, defaults to display. How to write the '&', defaults to '&amp;'.
 * @return string
 */
function get_edit_post_link( $id = 0, $context = 'display' ) {
        if ( ! $post = get_post( $id ) )
                return;

        if ( 'revision' === $post->post_type )
                $action = '';
        elseif ( 'display' == $context )
                $action = '&amp;action=edit';
        else
                $action = '&action=edit';

        $post_type_object = get_post_type_object( $post->post_type );
        if ( !$post_type_object )
                return;

        if ( !current_user_can( 'edit_post', $post->ID ) )
                return;

        /**
         * Filter the post edit link.
         *
         * @since 2.3.0
         *
         * @param string $link    The edit link.
         * @param int    $post_id Post ID.
         * @param string $context The link context. If set to 'display' then ampersands
         *                        are encoded.
         */
        return apply_filters( 'get_edit_post_link', admin_url( sprintf( $post_type_object->_edit_link . $action, $post->ID ) ), $post->ID, $context );
}

/**
 * Display edit post link for post.
 *
 * @since 1.0.0
 *
 * @param string $text Optional. Anchor text.
 * @param string $before Optional. Display before edit link.
 * @param string $after Optional. Display after edit link.
 * @param int $id Optional. Post ID.
 */
function edit_post_link( $text = null, $before = '', $after = '', $id = 0 ) {
        if ( ! $post = get_post( $id ) ) {
                return;
        }

        if ( ! $url = get_edit_post_link( $post->ID ) ) {
                return;
        }

        if ( null === $text ) {
                $text = __( 'Edit This' );
        }

        $link = '<a class="post-edit-link" href="' . $url . '">' . $text . '</a>';

        /**
         * Filter the post edit link anchor tag.
         *
         * @since 2.3.0
         *
         * @param string $link    Anchor tag for the edit link.
         * @param int    $post_id Post ID.
         * @param string $text    Anchor text.
         */
        echo $before . apply_filters( 'edit_post_link', $link, $post->ID, $text ) . $after;
}

/**
 * Retrieve delete posts link for post.
 *
 * Can be used within the WordPress loop or outside of it, with any post type.
 *
 * @since 2.9.0
 *
 * @param int $id Optional. Post ID.
 * @param string $deprecated Not used.
 * @param bool $force_delete Whether to bypass trash and force deletion. Default is false.
 * @return string
 */
function get_delete_post_link( $id = 0, $deprecated = '', $force_delete = false ) {
        if ( ! empty( $deprecated ) )
                _deprecated_argument( __FUNCTION__, '3.0' );

        if ( !$post = get_post( $id ) )
                return;

        $post_type_object = get_post_type_object( $post->post_type );
        if ( !$post_type_object )
                return;

        if ( !current_user_can( 'delete_post', $post->ID ) )
                return;

        $action = ( $force_delete || !EMPTY_TRASH_DAYS ) ? 'delete' : 'trash';

        $delete_link = add_query_arg( 'action', $action, admin_url( sprintf( $post_type_object->_edit_link, $post->ID ) ) );

        /**
         * Filter the post delete link.
         *
         * @since 2.9.0
         *
         * @param string $link         The delete link.
         * @param int    $post_id      Post ID.
         * @param bool   $force_delete Whether to bypass the trash and force deletion. Default false.
         */
        return apply_filters( 'get_delete_post_link', wp_nonce_url( $delete_link, "$action-post_{$post->ID}" ), $post->ID, $force_delete );
}

/**
 * Retrieve edit comment link.
 *
 * @since 2.3.0
 *
 * @param int $comment_id Optional. Comment ID.
 * @return string
 */
function get_edit_comment_link( $comment_id = 0 ) {
        $comment = get_comment( $comment_id );

        if ( !current_user_can( 'edit_comment', $comment->comment_ID ) )
                return;

        $location = admin_url('comment.php?action=editcomment&amp;c=') . $comment->comment_ID;

        /**
         * Filter the comment edit link.
         *
         * @since 2.3.0
         *
         * @param string $location The edit link.
         */
        return apply_filters( 'get_edit_comment_link', $location );
}

/**
 * Display edit comment link with formatting.
 *
 * @since 1.0.0
 *
 * @param string $text Optional. Anchor text.
 * @param string $before Optional. Display before edit link.
 * @param string $after Optional. Display after edit link.
 */
function edit_comment_link( $text = null, $before = '', $after = '' ) {
        global $comment;

        if ( ! current_user_can( 'edit_comment', $comment->comment_ID ) ) {
                return;
        }

        if ( null === $text ) {
                $text = __( 'Edit This' );
        }

        $link = '<a class="comment-edit-link" href="' . get_edit_comment_link( $comment->comment_ID ) . '">' . $text . '</a>';

        /**
         * Filter the comment edit link anchor tag.
         *
         * @since 2.3.0
         *
         * @param string $link       Anchor tag for the edit link.
         * @param int    $comment_id Comment ID.
         * @param string $text       Anchor text.
         */
        echo $before . apply_filters( 'edit_comment_link', $link, $comment->comment_ID, $text ) . $after;
}

/**
 * Display edit bookmark (literally a URL external to blog) link.
 *
 * @since 2.7.0
 *
 * @param int $link Optional. Bookmark ID.
 * @return string
 */
function get_edit_bookmark_link( $link = 0 ) {
        $link = get_bookmark( $link );

        if ( !current_user_can('manage_links') )
                return;

        $location = admin_url('link.php?action=edit&amp;link_id=') . $link->link_id;

        /**
         * Filter the bookmark (link) edit link.
         *
         * @since 2.7.0
         *
         * @param string $location The edit link.
         * @param int    $link_id  Bookmark ID.
         */
        return apply_filters( 'get_edit_bookmark_link', $location, $link->link_id );
}

/**
 * Display edit bookmark (literally a URL external to blog) link anchor content.
 *
 * @since 2.7.0
 *
 * @param string $link Optional. Anchor text.
 * @param string $before Optional. Display before edit link.
 * @param string $after Optional. Display after edit link.
 * @param int $bookmark Optional. Bookmark ID.
 */
function edit_bookmark_link( $link = '', $before = '', $after = '', $bookmark = null ) {
        $bookmark = get_bookmark($bookmark);

        if ( !current_user_can('manage_links') )
                return;

        if ( empty($link) )
                $link = __('Edit This');

        $link = '<a href="' . get_edit_bookmark_link( $bookmark ) . '">' . $link . '</a>';

        /**
         * Filter the bookmark edit link anchor tag.
         *
         * @since 2.7.0
         *
         * @param string $link    Anchor tag for the edit link.
         * @param int    $link_id Bookmark ID.
         */
        echo $before . apply_filters( 'edit_bookmark_link', $link, $bookmark->link_id ) . $after;
}

/**
 * Retrieve edit user link
 *
 * @since 3.5.0
 *
 * @param int $user_id Optional. User ID. Defaults to the current user.
 * @return string URL to edit user page or empty string.
 */
function get_edit_user_link( $user_id = null ) {
        if ( ! $user_id )
                $user_id = get_current_user_id();

        if ( empty( $user_id ) || ! current_user_can( 'edit_user', $user_id ) )
                return '';

        $user = get_userdata( $user_id );

        if ( ! $user )
                return '';

        if ( get_current_user_id() == $user->ID )
                $link = get_edit_profile_url( $user->ID );
        else
                $link = add_query_arg( 'user_id', $user->ID, self_admin_url( 'user-edit.php' ) );

        /**
         * Filter the user edit link.
         *
         * @since 3.5.0
         *
         * @param string $link    The edit link.
         * @param int    $user_id User ID.
         */
        return apply_filters( 'get_edit_user_link', $link, $user->ID );
}

// Navigation links

/**
 * Retrieve previous post that is adjacent to current post.
 *
 * @since 1.5.0
 *
 * @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return mixed       Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
 */
function get_previous_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        return get_adjacent_post( $in_same_term, $excluded_terms, true, $taxonomy );
}

/**
 * Retrieve next post that is adjacent to current post.
 *
 * @since 1.5.0
 *
 * @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return mixed       Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
 */
function get_next_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        return get_adjacent_post( $in_same_term, $excluded_terms, false, $taxonomy );
}

/**
 * Retrieve adjacent post.
 *
 * Can either be next or previous post.
 *
 * @since 2.5.0
 *
 * @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param bool         $previous       Optional. Whether to retrieve previous post.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return mixed       Post object if successful. Null if global $post is not set. Empty string if no corresponding post exists.
 */
function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
        global $wpdb;

        if ( ( ! $post = get_post() ) || ! taxonomy_exists( $taxonomy ) )
                return null;

        $current_post_date = $post->post_date;

        $join = '';
        $where = '';

        if ( $in_same_term || ! empty( $excluded_terms ) ) {
                $join = " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";
                $where = $wpdb->prepare( "AND tt.taxonomy = %s", $taxonomy );

                if ( ! empty( $excluded_terms ) && ! is_array( $excluded_terms ) ) {
                        // back-compat, $excluded_terms used to be $excluded_terms with IDs separated by " and "
                        if ( false !== strpos( $excluded_terms, ' and ' ) ) {
                                _deprecated_argument( __FUNCTION__, '3.3', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
                                $excluded_terms = explode( ' and ', $excluded_terms );
                        } else {
                                $excluded_terms = explode( ',', $excluded_terms );
                        }

                        $excluded_terms = array_map( 'intval', $excluded_terms );
                }

                if ( $in_same_term ) {
                        if ( ! is_object_in_taxonomy( $post->post_type, $taxonomy ) )
                                return '';
                        $term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );

                        // Remove any exclusions from the term array to include.
                        $term_array = array_diff( $term_array, (array) $excluded_terms );
                        $term_array = array_map( 'intval', $term_array );

                        if ( ! $term_array || is_wp_error( $term_array ) )
                                return '';

                        $where .= " AND tt.term_id IN (" . implode( ',', $term_array ) . ")";
                }

                if ( ! empty( $excluded_terms ) ) {
                        $where .= " AND p.ID NOT IN ( SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id IN (" . implode( $excluded_terms, ',' ) . ') )';
                }
        }

        $adjacent = $previous ? 'previous' : 'next';
        $op = $previous ? '<' : '>';
        $order = $previous ? 'DESC' : 'ASC';

        /**
         * Filter the JOIN clause in the SQL for an adjacent post query.
         *
         * The dynamic portion of the hook name, $adjacent, refers to the type
         * of adjacency, 'next' or 'previous'.
         *
         * @since 2.5.0
         *
         * @param string $join           The JOIN clause in the SQL.
         * @param bool   $in_same_term   Whether post should be in a same taxonomy term.
         * @param array  $excluded_terms Array of excluded term IDs.
         */
        $join  = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms );

        /**
         * Filter the WHERE clause in the SQL for an adjacent post query.
         *
         * The dynamic portion of the hook name, $adjacent, refers to the type
         * of adjacency, 'next' or 'previous'.
         *
         * @since 2.5.0
         *
         * @param string $where          The WHERE clause in the SQL.
         * @param bool   $in_same_term   Whether post should be in a same taxonomy term.
         * @param array  $excluded_terms Array of excluded term IDs.
         */
        $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $where", $current_post_date, $post->post_type ), $in_same_term, $excluded_terms );

        /**
         * Filter the ORDER BY clause in the SQL for an adjacent post query.
         *
         * The dynamic portion of the hook name, $adjacent, refers to the type
         * of adjacency, 'next' or 'previous'.
         *
         * @since 2.5.0
         *
         * @param string $order_by The ORDER BY clause in the SQL.
         */
        $sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );

        $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
        $query_key = 'adjacent_post_' . md5( $query );
        $result = wp_cache_get( $query_key, 'counts' );
        if ( false !== $result ) {
                if ( $result )
                        $result = get_post( $result );
                return $result;
        }

        $result = $wpdb->get_var( $query );
        if ( null === $result )
                $result = '';

        wp_cache_set( $query_key, $result, 'counts' );

        if ( $result )
                $result = get_post( $result );

        return $result;
}

/**
 * Get adjacent post relational link.
 *
 * Can either be next or previous post relational link.
 *
 * @since 2.8.0
 *
 * @param string       $title          Optional. Link title format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param bool         $previous       Optional. Whether to display link to previous or next post. Default true.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string
 */
function get_adjacent_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
        if ( $previous && is_attachment() && $post = get_post() )
                $post = get_post( $post->post_parent );
        else
                $post = get_adjacent_post( $in_same_term, $excluded_terms, $previous, $taxonomy );

        if ( empty( $post ) )
                return;

        $post_title = the_title_attribute( array( 'echo' => false, 'post' => $post ) );

        if ( empty( $post_title ) )
                $post_title = $previous ? __( 'Previous Post' ) : __( 'Next Post' );

        $date = mysql2date( get_option( 'date_format' ), $post->post_date );

        $title = str_replace( '%title', $post_title, $title );
        $title = str_replace( '%date', $date, $title );

        $link = $previous ? "<link rel='prev' title='" : "<link rel='next' title='";
        $link .= esc_attr( $title );
        $link .= "' href='" . get_permalink( $post ) . "' />\n";

        $adjacent = $previous ? 'previous' : 'next';

        /**
         * Filter the adjacent post relational link.
         *
         * The dynamic portion of the hook name, $adjacent, refers to the type
         * of adjacency, 'next' or 'previous'.
         *
         * @since 2.8.0
         *
         * @param string $link The relational link.
         */
        return apply_filters( "{$adjacent}_post_rel_link", $link );
}

/**
 * Display relational links for the posts adjacent to the current post.
 *
 * @since 2.8.0
 *
 * @param string       $title          Optional. Link title format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 */
function adjacent_posts_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms, true, $taxonomy );
        echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms, false, $taxonomy );
}

/**
 * Display relational links for the posts adjacent to the current post for single post pages.
 *
 * This is meant to be attached to actions like 'wp_head'. Do not call this directly in plugins or theme templates.
 * @since 3.0.0
 *
 */
function adjacent_posts_rel_link_wp_head() {
        if ( ! is_single() || is_attachment() ) {
                return;
        }
        adjacent_posts_rel_link();
}

/**
 * Display relational link for the next post adjacent to the current post.
 *
 * @since 2.8.0
 *
 * @param string       $title          Optional. Link title format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 */
function next_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms, false, $taxonomy );
}

/**
 * Display relational link for the previous post adjacent to the current post.
 *
 * @since 2.8.0
 *
 * @param string       $title          Optional. Link title format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default true.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 */
function prev_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms, true, $taxonomy );
}

/**
 * Retrieve boundary post.
 *
 * Boundary being either the first or last post by publish date within the constraints specified
 * by $in_same_term or $excluded_terms.
 *
 * @since 2.8.0
 *
 * @param bool         $in_same_term   Optional. Whether returned post should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param bool         $start          Optional. Whether to retrieve first or last post.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return mixed Array containing the boundary post object if successful, null otherwise.
 */
function get_boundary_post( $in_same_term = false, $excluded_terms = '', $start = true, $taxonomy = 'category' ) {
        $post = get_post();
        if ( ! $post || ! is_single() || is_attachment() || ! taxonomy_exists( $taxonomy ) )
                return null;

        $query_args = array(
                'posts_per_page' => 1,
                'order' => $start ? 'ASC' : 'DESC',
                'update_post_term_cache' => false,
                'update_post_meta_cache' => false
        );

        $term_array = array();

        if ( ! is_array( $excluded_terms ) ) {
                if ( ! empty( $excluded_terms ) )
                        $excluded_terms = explode( ',', $excluded_terms );
                else
                        $excluded_terms = array();
        }

        if ( $in_same_term || ! empty( $excluded_terms ) ) {
                if ( $in_same_term )
                        $term_array = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'ids' ) );

                if ( ! empty( $excluded_terms ) ) {
                        $excluded_terms = array_map( 'intval', $excluded_terms );
                        $excluded_terms = array_diff( $excluded_terms, $term_array );

                        $inverse_terms = array();
                        foreach ( $excluded_terms as $excluded_term )
                                $inverse_terms[] = $excluded_term * -1;
                        $excluded_terms = $inverse_terms;
                }

                $query_args[ 'tax_query' ] = array( array(
                        'taxonomy' => $taxonomy,
                        'terms' => array_merge( $term_array, $excluded_terms )
                ) );
        }

        return get_posts( $query_args );
}

/*
 * Get previous post link that is adjacent to the current post.
 *
 * @since 3.7.0
 *
 * @param string       $format         Optional. Link anchor format.
 * @param string       $link           Optional. Link permalink format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string
 */
function get_previous_post_link( $format = '&laquo; %link', $link = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        return get_adjacent_post_link( $format, $link, $in_same_term, $excluded_terms, true, $taxonomy );
}

/**
 * Display previous post link that is adjacent to the current post.
 *
 * @since 1.5.0
 * @see get_previous_post_link()
 *
 * @param string       $format         Optional. Link anchor format.
 * @param string       $link           Optional. Link permalink format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 */
function previous_post_link( $format = '&laquo; %link', $link = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        echo get_previous_post_link( $format, $link, $in_same_term, $excluded_terms, $taxonomy );
}

/**
 * Get next post link that is adjacent to the current post.
 *
 * @since 3.7.0
 *
 * @param string       $format         Optional. Link anchor format.
 * @param string       $link           Optional. Link permalink format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string
 */
function get_next_post_link( $format = '%link &raquo;', $link = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
        return get_adjacent_post_link( $format, $link, $in_same_term, $excluded_terms, false, $taxonomy );
}

/**
 * Display next post link that is adjacent to the current post.
 *
 * @since 1.5.0
 * @see get_next_post_link()
 *
 * @param string       $format         Optional. Link anchor format.
 * @param string       $link           Optional. Link permalink format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 */
function next_post_link( $format = '%link &raquo;', $link = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
         echo get_next_post_link( $format, $link, $in_same_term, $excluded_terms, $taxonomy );
}

/**
 * Get adjacent post link.
 *
 * Can be either next post link or previous.
 *
 * @since 3.7.0
 *
 * @param string       $format         Link anchor format.
 * @param string       $link           Link permalink format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded terms IDs.
 * @param bool         $previous       Optional. Whether to display link to previous or next post. Default true.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string
 */
function get_adjacent_post_link( $format, $link, $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
        if ( $previous && is_attachment() )
                $post = get_post( get_post()->post_parent );
        else
                $post = get_adjacent_post( $in_same_term, $excluded_terms, $previous, $taxonomy );

        if ( ! $post ) {
                $output = '';
        } else {
                $title = $post->post_title;

                if ( empty( $post->post_title ) )
                        $title = $previous ? __( 'Previous Post' ) : __( 'Next Post' );

                /** This filter is documented in wp-includes/post-template.php */
                $title = apply_filters( 'the_title', $title, $post->ID );

                $date = mysql2date( get_option( 'date_format' ), $post->post_date );
                $rel = $previous ? 'prev' : 'next';

                $string = '<a href="' . get_permalink( $post ) . '" rel="'.$rel.'">';
                $inlink = str_replace( '%title', $title, $link );
                $inlink = str_replace( '%date', $date, $inlink );
                $inlink = $string . $inlink . '</a>';

                $output = str_replace( '%link', $inlink, $format );
        }

        $adjacent = $previous ? 'previous' : 'next';

        /**
         * Filter the adjacent post link.
         *
         * The dynamic portion of the hook name, $adjacent, refers to the type
         * of adjacency, 'next' or 'previous'.
         *
         * @since 2.6.0
         *
         * @param string  $output The adjacent post link.
         * @param string  $format Link anchor format.
         * @param string  $link   Link permalink format.
         * @param WP_Post $post   The adjacent post.
         */
        return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post );
}

/**
 * Display adjacent post link.
 *
 * Can be either next post link or previous.
 *
 * @since 2.5.0
 * @uses get_adjacent_post_link()
 *
 * @param string       $format         Link anchor format.
 * @param string       $link           Link permalink format.
 * @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
 * @param array|string $excluded_terms Optional. Array or comma-separated list of excluded category IDs.
 * @param bool         $previous       Optional. Whether to display link to previous or next post. Default true.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string
 */
function adjacent_post_link( $format, $link, $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
        echo get_adjacent_post_link( $format, $link, $in_same_term, $excluded_terms, $previous, $taxonomy );
}

/**
 * Retrieve links for page numbers.
 *
 * @since 1.5.0
 *
 * @param int $pagenum Optional. Page ID.
 * @param bool $escape Optional. Whether to escape the URL for display, with esc_url(). Defaults to true.
*       Otherwise, prepares the URL with esc_url_raw().
 * @return string
 */
function get_pagenum_link($pagenum = 1, $escape = true ) {
        global $wp_rewrite;

        $pagenum = (int) $pagenum;

        $request = remove_query_arg( 'paged' );

        $home_root = parse_url(home_url());
        $home_root = ( isset($home_root['path']) ) ? $home_root['path'] : '';
        $home_root = preg_quote( $home_root, '|' );

        $request = preg_replace('|^'. $home_root . '|i', '', $request);
        $request = preg_replace('|^/+|', '', $request);

        if ( !$wp_rewrite->using_permalinks() || is_admin() ) {
                $base = trailingslashit( get_bloginfo( 'url' ) );

                if ( $pagenum > 1 ) {
                        $result = add_query_arg( 'paged', $pagenum, $base . $request );
                } else {
                        $result = $base . $request;
                }
        } else {
                $qs_regex = '|\?.*?$|';
                preg_match( $qs_regex, $request, $qs_match );

                if ( !empty( $qs_match[0] ) ) {
                        $query_string = $qs_match[0];
                        $request = preg_replace( $qs_regex, '', $request );
                } else {
                        $query_string = '';
                }

                $request = preg_replace( "|$wp_rewrite->pagination_base/\d+/?$|", '', $request);
                $request = preg_replace( '|^' . preg_quote( $wp_rewrite->index, '|' ) . '|i', '', $request);
                $request = ltrim($request, '/');

                $base = trailingslashit( get_bloginfo( 'url' ) );

                if ( $wp_rewrite->using_index_permalinks() && ( $pagenum > 1 || '' != $request ) )
                        $base .= $wp_rewrite->index . '/';

                if ( $pagenum > 1 ) {
                        $request = ( ( !empty( $request ) ) ? trailingslashit( $request ) : $request ) . user_trailingslashit( $wp_rewrite->pagination_base . "/" . $pagenum, 'paged' );
                }

                $result = $base . $request . $query_string;
        }

        /**
         * Filter the page number link for the current request.
         *
         * @since 2.5.0
         *
         * @param string $result The page number link.
         */
        $result = apply_filters( 'get_pagenum_link', $result );

        if ( $escape )
                return esc_url( $result );
        else
                return esc_url_raw( $result );
}

/**
 * Retrieve next posts page link.
 *
 * Backported from 2.1.3 to 2.0.10.
 *
 * @since 2.0.10
 *
 * @param int $max_page Optional. Max pages.
 * @return string
 */
function get_next_posts_page_link($max_page = 0) {
        global $paged;

        if ( !is_single() ) {
                if ( !$paged )
                        $paged = 1;
                $nextpage = intval($paged) + 1;
                if ( !$max_page || $max_page >= $nextpage )
                        return get_pagenum_link($nextpage);
        }
}

/**
 * Display or return the next posts page link.
 *
 * @since 0.71
 *
 * @param int $max_page Optional. Max pages.
 * @param boolean $echo Optional. Echo or return;
 */
function next_posts( $max_page = 0, $echo = true ) {
        $output = esc_url( get_next_posts_page_link( $max_page ) );

        if ( $echo )
                echo $output;
        else
                return $output;
}

/**
 * Return the next posts page link.
 *
 * @since 2.7.0
 *
 * @param string $label Content for link text.
 * @param int $max_page Optional. Max pages.
 * @return string|null
 */
function get_next_posts_link( $label = null, $max_page = 0 ) {
        global $paged, $wp_query;

        if ( !$max_page )
                $max_page = $wp_query->max_num_pages;

        if ( !$paged )
                $paged = 1;

        $nextpage = intval($paged) + 1;

        if ( null === $label )
                $label = __( 'Next Page &raquo;' );

        if ( !is_single() && ( $nextpage <= $max_page ) ) {
                /**
                 * Filter the anchor tag attributes for the next posts page link.
                 *
                 * @since 2.7.0
                 *
                 * @param string $attributes Attributes for the anchor tag.
                 */
                $attr = apply_filters( 'next_posts_link_attributes', '' );

                return '<a href="' . next_posts( $max_page, false ) . "\" $attr>" . preg_replace('/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $label) . '</a>';
        }
}

/**
 * Display the next posts page link.
 *
 * @since 0.71
 * @uses get_next_posts_link()
 *
 * @param string $label Content for link text.
 * @param int $max_page Optional. Max pages.
 */
function next_posts_link( $label = null, $max_page = 0 ) {
        echo get_next_posts_link( $label, $max_page );
}

/**
 * Retrieve previous posts page link.
 *
 * Will only return string, if not on a single page or post.
 *
 * Backported to 2.0.10 from 2.1.3.
 *
 * @since 2.0.10
 *
 * @return string|null
 */
function get_previous_posts_page_link() {
        global $paged;

        if ( !is_single() ) {
                $nextpage = intval($paged) - 1;
                if ( $nextpage < 1 )
                        $nextpage = 1;
                return get_pagenum_link($nextpage);
        }
}

/**
 * Display or return the previous posts page link.
 *
 * @since 0.71
 *
 * @param boolean $echo Optional. Echo or return;
 */
function previous_posts( $echo = true ) {
        $output = esc_url( get_previous_posts_page_link() );

        if ( $echo )
                echo $output;
        else
                return $output;
}

/**
 * Return the previous posts page link.
 *
 * @since 2.7.0
 *
 * @param string $label Optional. Previous page link text.
 * @return string|null
 */
function get_previous_posts_link( $label = null ) {
        global $paged;

        if ( null === $label )
                $label = __( '&laquo; Previous Page' );

        if ( !is_single() && $paged > 1 ) {
                /**
                 * Filter the anchor tag attributes for the previous posts page link.
                 *
                 * @since 2.7.0
                 *
                 * @param string $attributes Attributes for the anchor tag.
                 */
                $attr = apply_filters( 'previous_posts_link_attributes', '' );
                return '<a href="' . previous_posts( false ) . "\" $attr>". preg_replace( '/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $label ) .'</a>';
        }
}

/**
 * Display the previous posts page link.
 *
 * @since 0.71
 * @uses get_previous_posts_link()
 *
 * @param string $label Optional. Previous page link text.
 */
function previous_posts_link( $label = null ) {
        echo get_previous_posts_link( $label );
}

/**
 * Return post pages link navigation for previous and next pages.
 *
 * @since 2.8.0
 *
 * @param string|array $args Optional args.
 * @return string The posts link navigation.
 */
function get_posts_nav_link( $args = array() ) {
        global $wp_query;

        $return = '';

        if ( !is_singular() ) {
                $defaults = array(
                        'sep' => ' &#8212; ',
                        'prelabel' => __('&laquo; Previous Page'),
                        'nxtlabel' => __('Next Page &raquo;'),
                );
                $args = wp_parse_args( $args, $defaults );

                $max_num_pages = $wp_query->max_num_pages;
                $paged = get_query_var('paged');

                //only have sep if there's both prev and next results
                if ($paged < 2 || $paged >= $max_num_pages) {
                        $args['sep'] = '';
                }

                if ( $max_num_pages > 1 ) {
                        $return = get_previous_posts_link($args['prelabel']);
                        $return .= preg_replace('/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $args['sep']);
                        $return .= get_next_posts_link($args['nxtlabel']);
                }
        }
        return $return;

}

/**
 * Display post pages link navigation for previous and next pages.
 *
 * @since 0.71
 *
 * @param string $sep Optional. Separator for posts navigation links.
 * @param string $prelabel Optional. Label for previous pages.
 * @param string $nxtlabel Optional Label for next pages.
 */
function posts_nav_link( $sep = '', $prelabel = '', $nxtlabel = '' ) {
        $args = array_filter( compact('sep', 'prelabel', 'nxtlabel') );
        echo get_posts_nav_link($args);
}

/**
 * Retrieve comments page number link.
 *
 * @since 2.7.0
 *
 * @param int $pagenum Optional. Page number.
 * @return string
 */
function get_comments_pagenum_link( $pagenum = 1, $max_page = 0 ) {
        global $wp_rewrite;

        $pagenum = (int) $pagenum;

        $result = get_permalink();

        if ( 'newest' == get_option('default_comments_page') ) {
                if ( $pagenum != $max_page ) {
                        if ( $wp_rewrite->using_permalinks() )
                                $result = user_trailingslashit( trailingslashit($result) . 'comment-page-' . $pagenum, 'commentpaged');
                        else
                                $result = add_query_arg( 'cpage', $pagenum, $result );
                }
        } elseif ( $pagenum > 1 ) {
                if ( $wp_rewrite->using_permalinks() )
                        $result = user_trailingslashit( trailingslashit($result) . 'comment-page-' . $pagenum, 'commentpaged');
                else
                        $result = add_query_arg( 'cpage', $pagenum, $result );
        }

        $result .= '#comments';

        /**
         * Filter the comments page number link for the current request.
         *
         * @since 2.7.0
         *
         * @param string $result The comments page number link.
         */
        $result = apply_filters( 'get_comments_pagenum_link', $result );

        return $result;
}

/**
 * Return the link to next comments page.
 *
 * @since 2.7.1
 *
 * @param string $label Optional. Label for link text.
 * @param int $max_page Optional. Max page.
 * @return string|null
 */
function get_next_comments_link( $label = '', $max_page = 0 ) {
        global $wp_query;

        if ( !is_singular() || !get_option('page_comments') )
                return;

        $page = get_query_var('cpage');

        $nextpage = intval($page) + 1;

        if ( empty($max_page) )
                $max_page = $wp_query->max_num_comment_pages;

        if ( empty($max_page) )
                $max_page = get_comment_pages_count();

        if ( $nextpage > $max_page )
                return;

        if ( empty($label) )
                $label = __('Newer Comments &raquo;');

        /**
         * Filter the anchor tag attributes for the next comments page link.
         *
         * @since 2.7.0
         *
         * @param string $attributes Attributes for the anchor tag.
         */
        return '<a href="' . esc_url( get_comments_pagenum_link( $nextpage, $max_page ) ) . '" ' . apply_filters( 'next_comments_link_attributes', '' ) . '>'. preg_replace('/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $label) .'</a>';
}

/**
 * Display the link to next comments page.
 *
 * @since 2.7.0
 *
 * @param string $label Optional. Label for link text.
 * @param int $max_page Optional. Max page.
 */
function next_comments_link( $label = '', $max_page = 0 ) {
        echo get_next_comments_link( $label, $max_page );
}

/**
 * Return the previous comments page link.
 *
 * @since 2.7.1
 *
 * @param string $label Optional. Label for comments link text.
 * @return string|null
 */
function get_previous_comments_link( $label = '' ) {
        if ( !is_singular() || !get_option('page_comments') )
                return;

        $page = get_query_var('cpage');

        if ( intval($page) <= 1 )
                return;

        $prevpage = intval($page) - 1;

        if ( empty($label) )
                $label = __('&laquo; Older Comments');

        /**
         * Filter the anchor tag attributes for the previous comments page link.
         *
         * @since 2.7.0
         *
         * @param string $attributes Attributes for the anchor tag.
         */
        return '<a href="' . esc_url( get_comments_pagenum_link( $prevpage ) ) . '" ' . apply_filters( 'previous_comments_link_attributes', '' ) . '>' . preg_replace('/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $label) .'</a>';
}

/**
 * Display the previous comments page link.
 *
 * @since 2.7.0
 *
 * @param string $label Optional. Label for comments link text.
 */
function previous_comments_link( $label = '' ) {
        echo get_previous_comments_link( $label );
}

/**
 * Create pagination links for the comments on the current post.
 *
 * @see paginate_links()
 * @since 2.7.0
 *
 * @param string|array $args Optional args. See paginate_links().
 * @return string Markup for pagination links.
*/
function paginate_comments_links($args = array()) {
        global $wp_rewrite;

        if ( !is_singular() || !get_option('page_comments') )
                return;

        $page = get_query_var('cpage');
        if ( !$page )
                $page = 1;
        $max_page = get_comment_pages_count();
        $defaults = array(
                'base' => add_query_arg( 'cpage', '%#%' ),
                'format' => '',
                'total' => $max_page,
                'current' => $page,
                'echo' => true,
                'add_fragment' => '#comments'
        );
        if ( $wp_rewrite->using_permalinks() )
                $defaults['base'] = user_trailingslashit(trailingslashit(get_permalink()) . 'comment-page-%#%', 'commentpaged');

        $args = wp_parse_args( $args, $defaults );
        $page_links = paginate_links( $args );

        if ( $args['echo'] )
                echo $page_links;
        else
                return $page_links;
}

/**
 * Retrieve the Press This bookmarklet link.
 *
 * Use this in 'a' element 'href' attribute.
 *
 * @since 2.6.0
 *
 * @return string
 */
function get_shortcut_link() {
        // In case of breaking changes, version this. #WP20071
        $link = "javascript:
                        var d=document,
                        w=window,
                        e=w.getSelection,
                        k=d.getSelection,
                        x=d.selection,
                        s=(e?e():(k)?k():(x?x.createRange().text:0)),
                        f='" . admin_url('press-this.php') . "',
                        l=d.location,
                        e=encodeURIComponent,
                        u=f+'?u='+e(l.href)+'&t='+e(d.title)+'&s='+e(s)+'&v=4';
                        a=function(){if(!w.open(u,'t','toolbar=0,resizable=1,scrollbars=1,status=1,width=720,height=570'))l.href=u;};
                        if (/Firefox/.test(navigator.userAgent)) setTimeout(a, 0); else a();
                        void(0)";

        $link = str_replace(array("\r", "\n", "\t"),  '', $link);

        /**
         * Filter the Press This bookmarklet link.
         *
         * @since 2.6.0
         *
         * @param string $link The Press This bookmarklet link.
         */
        return apply_filters( 'shortcut_link', $link );
}

/**
 * Retrieve the home url for the current site.
 *
 * Returns the 'home' option with the appropriate protocol, 'https' if
 * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
 * overridden.
 *
 * @since 3.0.0
 *
 * @uses get_home_url()
 *
 * @param  string $path   (optional) Path relative to the home url.
 * @param  string $scheme (optional) Scheme to give the home url context. Currently 'http', 'https', or 'relative'.
 * @return string Home url link with optional path appended.
*/
function home_url( $path = '', $scheme = null ) {
        return get_home_url( null, $path, $scheme );
}

/**
 * Retrieve the home url for a given site.
 *
 * Returns the 'home' option with the appropriate protocol, 'https' if
 * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
 * overridden.
 *
 * @since 3.0.0
 *
 * @param  int $blog_id   (optional) Blog ID. Defaults to current blog.
 * @param  string $path   (optional) Path relative to the home url.
 * @param  string $scheme (optional) Scheme to give the home url context. Currently 'http', 'https', or 'relative'.
 * @return string Home url link with optional path appended.
*/
function get_home_url( $blog_id = null, $path = '', $scheme = null ) {
        $orig_scheme = $scheme;

        if ( empty( $blog_id ) || !is_multisite() ) {
                $url = get_option( 'home' );
        } else {
                switch_to_blog( $blog_id );
                $url = get_option( 'home' );
                restore_current_blog();
        }

        if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ) ) ) {
                if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] )
                        $scheme = 'https';
                else
                        $scheme = parse_url( $url, PHP_URL_SCHEME );
        }

        $url = set_url_scheme( $url, $scheme );

        if ( $path && is_string( $path ) )
                $url .= '/' . ltrim( $path, '/' );

        /**
         * Filter the home URL.
         *
         * @since 3.0.0
         *
         * @param string      $url         The complete home URL including scheme and path.
         * @param string      $path        Path relative to the home URL. Blank string if no path is specified.
         * @param string|null $orig_scheme Scheme to give the home URL context. Accepts 'http', 'https', 'relative' or null.
         * @param int|null    $blog_id     Blog ID, or null for the current blog.
         */
        return apply_filters( 'home_url', $url, $path, $orig_scheme, $blog_id );
}

/**
 * Retrieve the site url for the current site.
 *
 * Returns the 'site_url' option with the appropriate protocol, 'https' if
 * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
 * overridden.
 *
 * @since 3.0.0
 *
 * @uses get_site_url()
 *
 * @param string $path Optional. Path relative to the site url.
 * @param string $scheme Optional. Scheme to give the site url context. See set_url_scheme().
 * @return string Site url link with optional path appended.
*/
function site_url( $path = '', $scheme = null ) {
        return get_site_url( null, $path, $scheme );
}

/**
 * Retrieve the site url for a given site.
 *
 * Returns the 'site_url' option with the appropriate protocol, 'https' if
 * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
 * overridden.
 *
 * @since 3.0.0
 *
 * @param int $blog_id (optional) Blog ID. Defaults to current blog.
 * @param string $path Optional. Path relative to the site url.
 * @param string $scheme Optional. Scheme to give the site url context. Currently 'http', 'https', 'login', 'login_post', 'admin', or 'relative'.
 * @return string Site url link with optional path appended.
*/
function get_site_url( $blog_id = null, $path = '', $scheme = null ) {
        if ( empty( $blog_id ) || !is_multisite() ) {
                $url = get_option( 'siteurl' );
        } else {
                switch_to_blog( $blog_id );
                $url = get_option( 'siteurl' );
                restore_current_blog();
        }

        $url = set_url_scheme( $url, $scheme );

        if ( $path && is_string( $path ) )
                $url .= '/' . ltrim( $path, '/' );

        /**
         * Filter the site URL.
         *
         * @since 2.7.0
         *
         * @param string      $url     The complete site URL including scheme and path.
         * @param string      $path    Path relative to the site URL. Blank string if no path is specified.
         * @param string|null $scheme  Scheme to give the site URL context. Accepts 'http', 'https', 'login',
         *                             'login_post', 'admin', 'relative' or null.
         * @param int|null    $blog_id Blog ID, or null for the current blog.
         */
        return apply_filters( 'site_url', $url, $path, $scheme, $blog_id );
}

/**
 * Retrieve the url to the admin area for the current site.
 *
 * @since 2.6.0
 *
 * @param string $path Optional path relative to the admin url.
 * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.
 * @return string Admin url link with optional path appended.
*/
function admin_url( $path = '', $scheme = 'admin' ) {
        return get_admin_url( null, $path, $scheme );
}

/**
 * Retrieve the url to the admin area for a given site.
 *
 * @since 3.0.0
 *
 * @param int $blog_id (optional) Blog ID. Defaults to current blog.
 * @param string $path Optional path relative to the admin url.
 * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.
 * @return string Admin url link with optional path appended.
*/
function get_admin_url( $blog_id = null, $path = '', $scheme = 'admin' ) {
        $url = get_site_url($blog_id, 'wp-admin/', $scheme);

        if ( $path && is_string( $path ) )
                $url .= ltrim( $path, '/' );

        /**
         * Filter the admin area URL.
         *
         * @since 2.8.0
         *
         * @param string   $url     The complete admin area URL including scheme and path.
         * @param string   $path    Path relative to the admin area URL. Blank string if no path is specified.
         * @param int|null $blog_id Blog ID, or null for the current blog.
         */
        return apply_filters( 'admin_url', $url, $path, $blog_id );
}

/**
 * Retrieve the url to the includes directory.
 *
 * @since 2.6.0
 *
 * @param string $path Optional. Path relative to the includes url.
 * @param string $scheme Optional. Scheme to give the includes url context.
 * @return string Includes url link with optional path appended.
*/
function includes_url( $path = '', $scheme = null ) {
        $url = site_url( '/' . WPINC . '/', $scheme );

        if ( $path && is_string( $path ) )
                $url .= ltrim($path, '/');

        /**
         * Filter the URL to the includes directory.
         *
         * @since 2.8.0
         *
         * @param string $url  The complete URL to the includes directory including scheme and path.
         * @param string $path Path relative to the URL to the wp-includes directory. Blank string
         *                     if no path is specified.
         */
        return apply_filters( 'includes_url', $url, $path );
}

/**
 * Retrieve the url to the content directory.
 *
 * @since 2.6.0
 *
 * @param string $path Optional. Path relative to the content url.
 * @return string Content url link with optional path appended.
*/
function content_url($path = '') {
        $url = set_url_scheme( WP_CONTENT_URL );

        if ( $path && is_string( $path ) )
                $url .= '/' . ltrim($path, '/');

        /**
         * Filter the URL to the content directory.
         *
         * @since 2.8.0
         *
         * @param string $url  The complete URL to the content directory including scheme and path.
         * @param string $path Path relative to the URL to the content directory. Blank string
         *                     if no path is specified.
         */
        return apply_filters( 'content_url', $url, $path);
}

/**
 * Retrieve a URL within the plugins or mu-plugins directory.
 *
 * Defaults to the plugins directory URL if no arguments are supplied.
 *
 * @since 2.6.0
 *
 * @param  string $path   Optional. Extra path appended to the end of the URL, including
 *                        the relative directory if $plugin is supplied. Default empty.
 * @param  string $plugin Optional. A full path to a file inside a plugin or mu-plugin.
 *                        The URL will be relative to its directory. Default empty.
 *                        Typically this is done by passing `__FILE__` as the argument.
 * @return string Plugins URL link with optional paths appended.
*/
function plugins_url( $path = '', $plugin = '' ) {

        $path = wp_normalize_path( $path );
        $plugin = wp_normalize_path( $plugin );
        $mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR );

        if ( !empty($plugin) && 0 === strpos($plugin, $mu_plugin_dir) )
                $url = WPMU_PLUGIN_URL;
        else
                $url = WP_PLUGIN_URL;


        $url = set_url_scheme( $url );

        if ( !empty($plugin) && is_string($plugin) ) {
                $folder = dirname(plugin_basename($plugin));
                if ( '.' != $folder )
                        $url .= '/' . ltrim($folder, '/');
        }

        if ( $path && is_string( $path ) )
                $url .= '/' . ltrim($path, '/');

        /**
         * Filter the URL to the plugins directory.
         *
         * @since 2.8.0
         *
         * @param string $url    The complete URL to the plugins directory including scheme and path.
         * @param string $path   Path relative to the URL to the plugins directory. Blank string
         *                       if no path is specified.
         * @param string $plugin The plugin file path to be relative to. Blank string if no plugin
         *                       is specified.
         */
        return apply_filters( 'plugins_url', $url, $path, $plugin );
}

/**
 * Retrieve the site url for the current network.
 *
 * Returns the site url with the appropriate protocol, 'https' if
 * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
 * overridden.
 *
 * @since 3.0.0
 *
 * @param string $path Optional. Path relative to the site url.
 * @param string $scheme Optional. Scheme to give the site url context. See set_url_scheme().
 * @return string Site url link with optional path appended.
*/
function network_site_url( $path = '', $scheme = null ) {
        if ( ! is_multisite() )
                return site_url($path, $scheme);

        $current_site = get_current_site();

        if ( 'relative' == $scheme )
                $url = $current_site->path;
        else
                $url = set_url_scheme( 'http://' . $current_site->domain . $current_site->path, $scheme );

        if ( $path && is_string( $path ) )
                $url .= ltrim( $path, '/' );

        /**
         * Filter the network site URL.
         *
         * @since 3.0.0
         *
         * @param string      $url    The complete network site URL including scheme and path.
         * @param string      $path   Path relative to the network site URL. Blank string if
         *                            no path is specified.
         * @param string|null $scheme Scheme to give the URL context. Accepts 'http', 'https',
         *                            'relative' or null.
         */
        return apply_filters( 'network_site_url', $url, $path, $scheme );
}

/**
 * Retrieve the home url for the current network.
 *
 * Returns the home url with the appropriate protocol, 'https' if
 * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
 * overridden.
 *
 * @since 3.0.0
 *
 * @param  string $path   (optional) Path relative to the home url.
 * @param  string $scheme (optional) Scheme to give the home url context. Currently 'http', 'https', or 'relative'.
 * @return string Home url link with optional path appended.
*/
function network_home_url( $path = '', $scheme = null ) {
        if ( ! is_multisite() )
                return home_url($path, $scheme);

        $current_site = get_current_site();
        $orig_scheme = $scheme;

        if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ) ) )
                $scheme = is_ssl() && ! is_admin() ? 'https' : 'http';

        if ( 'relative' == $scheme )
                $url = $current_site->path;
        else
                $url = set_url_scheme( 'http://' . $current_site->domain . $current_site->path, $scheme );

        if ( $path && is_string( $path ) )
                $url .= ltrim( $path, '/' );

        /**
         * Filter the network home URL.
         *
         * @since 3.0.0
         *
         * @param string      $url         The complete network home URL including scheme and path.
         * @param string      $path        Path relative to the network home URL. Blank string
         *                                 if no path is specified.
         * @param string|null $orig_scheme Scheme to give the URL context. Accepts 'http', 'https',
         *                                 'relative' or null.
         */
        return apply_filters( 'network_home_url', $url, $path, $orig_scheme);
}

/**
 * Retrieve the url to the admin area for the network.
 *
 * @since 3.0.0
 *
 * @param string $path Optional path relative to the admin url.
 * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.
 * @return string Admin url link with optional path appended.
*/
function network_admin_url( $path = '', $scheme = 'admin' ) {
        if ( ! is_multisite() )
                return admin_url( $path, $scheme );

        $url = network_site_url('wp-admin/network/', $scheme);

        if ( $path && is_string( $path ) )
                $url .= ltrim($path, '/');

        /**
         * Filter the network admin URL.
         *
         * @since 3.0.0
         *
         * @param string $url  The complete network admin URL including scheme and path.
         * @param string $path Path relative to the network admin URL. Blank string if
         *                     no path is specified.
         */
        return apply_filters( 'network_admin_url', $url, $path );
}

/**
 * Retrieve the url to the admin area for the current user.
 *
 * @since 3.0.0
 *
 * @param string $path Optional path relative to the admin url.
 * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.
 * @return string Admin url link with optional path appended.
*/
function user_admin_url( $path = '', $scheme = 'admin' ) {
        $url = network_site_url('wp-admin/user/', $scheme);

        if ( $path && is_string( $path ) )
                $url .= ltrim($path, '/');

        /**
         * Filter the user admin URL for the current user.
         *
         * @since 3.1.0
         *
         * @param string $url  The complete URL including scheme and path.
         * @param string $path Path relative to the URL. Blank string if
         *                     no path is specified.
         */
        return apply_filters( 'user_admin_url', $url, $path );
}

/**
 * Retrieve the url to the admin area for either the current blog or the network depending on context.
 *
 * @since 3.1.0
 *
 * @param string $path Optional path relative to the admin url.
 * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.
 * @return string Admin url link with optional path appended.
*/
function self_admin_url($path = '', $scheme = 'admin') {
        if ( is_network_admin() )
                return network_admin_url($path, $scheme);
        elseif ( is_user_admin() )
                return user_admin_url($path, $scheme);
        else
                return admin_url($path, $scheme);
}

/**
 * Set the scheme for a URL
 *
 * @since 3.4.0
 *
 * @param string $url Absolute url that includes a scheme
 * @param string $scheme Optional. Scheme to give $url. Currently 'http', 'https', 'login', 'login_post', 'admin', or 'relative'.
 * @return string $url URL with chosen scheme.
 */
function set_url_scheme( $url, $scheme = null ) {
        $orig_scheme = $scheme;

        if ( ! $scheme ) {
                $scheme = is_ssl() ? 'https' : 'http';
        } elseif ( $scheme === 'admin' || $scheme === 'login' || $scheme === 'login_post' || $scheme === 'rpc' ) {
                $scheme = is_ssl() || force_ssl_admin() ? 'https' : 'http';
        } elseif ( $scheme !== 'http' && $scheme !== 'https' && $scheme !== 'relative' ) {
                $scheme = is_ssl() ? 'https' : 'http';
        }

        $url = trim( $url );
        if ( substr( $url, 0, 2 ) === '//' )
                $url = 'http:' . $url;

        if ( 'relative' == $scheme ) {
                $url = ltrim( preg_replace( '#^\w+://[^/]*#', '', $url ) );
                if ( $url !== '' && $url[0] === '/' )
                        $url = '/' . ltrim($url , "/ \t\n\r\0\x0B" );
        } else {
                $url = preg_replace( '#^\w+://#', $scheme . '://', $url );
        }

        /**
         * Filter the resulting URL after setting the scheme.
         *
         * @since 3.4.0
         *
         * @param string $url         The complete URL including scheme and path.
         * @param string $scheme      Scheme applied to the URL. One of 'http', 'https', or 'relative'.
         * @param string $orig_scheme Scheme requested for the URL. One of 'http', 'https', 'login',
         *                            'login_post', 'admin', 'rpc', or 'relative'.
         */
        return apply_filters( 'set_url_scheme', $url, $scheme, $orig_scheme );
}

/**
 * Get the URL to the user's dashboard.
 *
 * If a user does not belong to any site, the global user dashboard is used. If the user belongs to the current site,
 * the dashboard for the current site is returned. If the user cannot edit the current site, the dashboard to the user's
 * primary blog is returned.
 *
 * @since 3.1.0
 *
 * @param int $user_id Optional. User ID. Defaults to current user.
 * @param string $path Optional path relative to the dashboard. Use only paths known to both blog and user admins.
 * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.
 * @return string Dashboard url link with optional path appended.
 */
function get_dashboard_url( $user_id = 0, $path = '', $scheme = 'admin' ) {
        $user_id = $user_id ? (int) $user_id : get_current_user_id();

        $blogs = get_blogs_of_user( $user_id );
        if ( ! is_super_admin() && empty($blogs) ) {
                $url = user_admin_url( $path, $scheme );
        } elseif ( ! is_multisite() ) {
                $url = admin_url( $path, $scheme );
        } else {
                $current_blog = get_current_blog_id();
                if ( $current_blog  && ( is_super_admin( $user_id ) || in_array( $current_blog, array_keys( $blogs ) ) ) ) {
                        $url = admin_url( $path, $scheme );
                } else {
                        $active = get_active_blog_for_user( $user_id );
                        if ( $active )
                                $url = get_admin_url( $active->blog_id, $path, $scheme );
                        else
                                $url = user_admin_url( $path, $scheme );
                }
        }

        /**
         * Filter the dashboard URL for a user.
         *
         * @since 3.1.0
         *
         * @param string $url     The complete URL including scheme and path.
         * @param int    $user_id The user ID.
         * @param string $path    Path relative to the URL. Blank string if no path is specified.
         * @param string $scheme  Scheme to give the URL context. Accepts 'http', 'https', 'login',
         *                        'login_post', 'admin', 'relative' or null.
         */
        return apply_filters( 'user_dashboard_url', $url, $user_id, $path, $scheme);
}

/**
 * Get the URL to the user's profile editor.
 *
 * @since 3.1.0
 *
 * @param int    $user_id Optional. User ID. Defaults to current user.
 * @param string $scheme  The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl().
 *                        'http' or 'https' can be passed to force those schemes.
 * @return string Dashboard url link with optional path appended.
 */
function get_edit_profile_url( $user_id = 0, $scheme = 'admin' ) {
        $user_id = $user_id ? (int) $user_id : get_current_user_id();

        if ( is_user_admin() )
                $url = user_admin_url( 'profile.php', $scheme );
        elseif ( is_network_admin() )
                $url = network_admin_url( 'profile.php', $scheme );
        else
                $url = get_dashboard_url( $user_id, 'profile.php', $scheme );

        /**
         * Filter the URL for a user's profile editor.
         *
         * @since 3.1.0
         *
         * @param string $url     The complete URL including scheme and path.
         * @param int    $user_id The user ID.
         * @param string $scheme  Scheme to give the URL context. Accepts 'http', 'https', 'login',
         *                        'login_post', 'admin', 'relative' or null.
         */
        return apply_filters( 'edit_profile_url', $url, $user_id, $scheme);
}

/**
 * Output rel=canonical for singular queries.
 *
 * @since 2.9.0
*/
function rel_canonical() {
        if ( !is_singular() )
                return;

        global $wp_the_query;
        if ( !$id = $wp_the_query->get_queried_object_id() )
                return;

        $link = get_permalink( $id );

        if ( $page = get_query_var('cpage') )
                $link = get_comments_pagenum_link( $page );

        echo "<link rel='canonical' href='$link' />\n";
}

/**
 * Return a shortlink for a post, page, attachment, or blog.
 *
 * This function exists to provide a shortlink tag that all themes and plugins can target. A plugin must hook in to
 * provide the actual shortlinks. Default shortlink support is limited to providing ?p= style links for posts.
 * Plugins can short-circuit this function via the pre_get_shortlink filter or filter the output
 * via the get_shortlink filter.
 *
 * @since 3.0.0.
 *
 * @param int $id A post or blog id. Default is 0, which means the current post or blog.
 * @param string $context Whether the id is a 'blog' id, 'post' id, or 'media' id. If 'post', the post_type of the post is consulted. If 'query', the current query is consulted to determine the id and context. Default is 'post'.
 * @param bool $allow_slugs Whether to allow post slugs in the shortlink. It is up to the plugin how and whether to honor this.
 * @return string A shortlink or an empty string if no shortlink exists for the requested resource or if shortlinks are not enabled.
 */
function wp_get_shortlink($id = 0, $context = 'post', $allow_slugs = true) {
        /**
         * Filter whether to preempt generating a shortlink for the given post.
         *
         * Passing a truthy value to the filter will effectively short-circuit the
         * shortlink-generation process, returning that value instead.
         *
         * @since 3.0.0
         *
         * @param bool|string $return      Short-circuit return value. Either false or a URL string.
         * @param int         $id          Post ID, or 0 for the current post.
         * @param string      $context     The context for the link. One of 'post' or 'query',
         * @param bool        $allow_slugs Whether to allow post slugs in the shortlink.
         */
        $shortlink = apply_filters( 'pre_get_shortlink', false, $id, $context, $allow_slugs );

        if ( false !== $shortlink )
                return $shortlink;

        global $wp_query;
        $post_id = 0;
        if ( 'query' == $context && is_singular() ) {
                $post_id = $wp_query->get_queried_object_id();
                $post = get_post( $post_id );
        } elseif ( 'post' == $context ) {
                $post = get_post( $id );
                if ( ! empty( $post->ID ) )
                        $post_id = $post->ID;
        }

        $shortlink = '';

        // Return p= link for all public post types.
        if ( ! empty( $post_id ) ) {
                $post_type = get_post_type_object( $post->post_type );

                if ( 'page' === $post->post_type && $post->ID == get_option( 'page_on_front' ) && 'page' == get_option( 'show_on_front' ) ) {
                        $shortlink = home_url( '/' );
                } elseif ( $post_type->public ) {
                        $shortlink = home_url( '?p=' . $post_id );
                }
        }

        /**
         * Filter the shortlink for a post.
         *
         * @since 3.0.0
         *
         * @param string $shortlink   Shortlink URL.
         * @param int    $id          Post ID, or 0 for the current post.
         * @param string $context     The context for the link. One of 'post' or 'query',
         * @param bool   $allow_slugs Whether to allow post slugs in the shortlink. Not used by default.
         */
        return apply_filters( 'get_shortlink', $shortlink, $id, $context, $allow_slugs );
}

/**
 *  Inject rel=shortlink into head if a shortlink is defined for the current page.
 *
 *  Attached to the wp_head action.
 *
 * @since 3.0.0
 *
 * @uses wp_get_shortlink()
 */
function wp_shortlink_wp_head() {
        $shortlink = wp_get_shortlink( 0, 'query' );

        if ( empty( $shortlink ) )
                return;

        echo "<link rel='shortlink' href='" . esc_url( $shortlink ) . "' />\n";
}

/**
 * Send a Link: rel=shortlink header if a shortlink is defined for the current page.
 *
 * Attached to the wp action.
 *
 * @since 3.0.0
 *
 * @uses wp_get_shortlink()
 */
function wp_shortlink_header() {
        if ( headers_sent() )
                return;

        $shortlink = wp_get_shortlink(0, 'query');

        if ( empty($shortlink) )
                return;

        header('Link: <' . $shortlink . '>; rel=shortlink', false);
}

/**
 * Display the Short Link for a Post
 *
 * Must be called from inside "The Loop"
 *
 * Call like the_shortlink(__('Shortlinkage FTW'))
 *
 * @since 3.0.0
 *
 * @param string $text Optional The link text or HTML to be displayed. Defaults to 'This is the short link.'
 * @param string $title Optional The tooltip for the link. Must be sanitized. Defaults to the sanitized post title.
 * @param string $before Optional HTML to display before the link.
 * @param string $after Optional HTML to display after the link.
 */
function the_shortlink( $text = '', $title = '', $before = '', $after = '' ) {
        $post = get_post();

        if ( empty( $text ) )
                $text = __('This is the short link.');

        if ( empty( $title ) )
                $title = the_title_attribute( array( 'echo' => false ) );

        $shortlink = wp_get_shortlink( $post->ID );

        if ( !empty( $shortlink ) ) {
                $link = '<a rel="shortlink" href="' . esc_url( $shortlink ) . '" title="' . $title . '">' . $text . '</a>';

                /**
                 * Filter the shortlink anchor tag for a post.
                 *
                 * @since 3.0.0
                 *
                 * @param string $link      Shortlink anchor tag.
                 * @param string $shortlink Shortlink URL.
                 * @param string $text      Shortlink's text.
                 * @param string $title     Shortlink's title attribute.
                 */
                $link = apply_filters( 'the_shortlink', $link, $shortlink, $text, $title );
                echo $before, $link, $after;
        }
}