/wp-includes/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 ( !empty($post_link) && ( !$draft_or_pending || $sample ) ) {

		if ( ! $leavename ) {

			if ( $post_type->hierarchical )

				$slug = get_page_uri($id);

			$post_link = str_replace("%$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;

	}

}