enmi-conf.org: comparison wp/wp-includes/link-template.php

equal deleted inserted replaced

-:490d5cc509ed
+:cf61fcea0001
 * @package WordPress
 * @subpackage Template
 */
 /**
-* Display the permalink for the current post.
+* Displays the permalink for the current post.
 *
 * @since 1.2.0
-*/
+* @since 4.4.0 Added the `$post` parameter.
-function the_permalink() {
+*
-	/**
+* @param int|WP_Post $post Optional. Post ID or post object. Default is the global `$post`.
-	 * Filter the display of the permalink for the current post.
+*/
+function the_permalink( $post = 0 ) {
+	/**
+	 * Filters the display of the permalink for the current post.
 	 *
 	 * @since 1.5.0
-	 *
+	 * @since 4.4.0 Added the `$post` parameter.
-	 * @param string $permalink The permalink for the current post.
+	 *
-	 */
+	 * @param string      $permalink The permalink for the current post.
-	echo esc_url( apply_filters( 'the_permalink', get_permalink() ) );
+	 * @param int|WP_Post $post      Post ID, WP_Post object, or 0. Default 0.
-}
+	 */
+	echo esc_url( apply_filters( 'the_permalink', get_permalink( $post ), $post ) );
-/**
+}
-* Retrieve trailing slash string, if blog set for adding trailing slashes.
+/**
+* Retrieves a trailing-slashed string if the site is 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
+* {@see 'user_trailingslashit'} filter. Will remove trailing slash from string, if
-* blog is not set to have them.
+* site is not set to have them.
 *
 * @since 2.2.0
-* @uses $wp_rewrite
+*
-*
+* @global WP_Rewrite $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.
+* @param string $string      URL with or without a trailing slash.
+* @param string $type_of_url Optional. The type of URL being considered (e.g. single, category, etc)
+*                            for use in the filter. Default empty string.
 * @return string The URL with the trailing slash appended or stripped.
 */
 function user_trailingslashit($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
+	 * Filters the trailing-slashed string, depending on whether the site is set to use trailing slashes.
-	 * 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',
+	 *                            'single_feed', 'single_paged', 'commentpaged', 'paged', 'home', 'feed',
-	 *                            'month', 'day', 'paged', 'post_type_archive'.
+	 *                            'category', 'page', 'year', 'month', 'day', 'post_type_archive'.
 	 */
-	$string = apply_filters( 'user_trailingslashit', $string, $type_of_url );
+	return apply_filters( 'user_trailingslashit', $string, $type_of_url );
-	return $string;
+}
-}
+/**
-/**
+* Displays the permalink anchor for the current post.
-* 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'.
+* @param string $mode Optional. Permalink mode. Accepts 'title' or 'id'. Default 'id'.
 */
 function permalink_anchor( $mode = 'id' ) {
 	$post = get_post();
 	switch ( strtolower( $mode ) ) {
 		case 'title':
 			break;
 	}
 }
 /**
-* Retrieve full permalink for current post or post ID.
+* Retrieves the full permalink for the 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 int|WP_Post $post      Optional. Post ID or post object. Default is the global `$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.
+*
-*/
+* @return string|false The permalink URL or false if post does not exist.
-function get_the_permalink( $id = 0, $leavename = false ) {
+*/
-	return get_permalink( $id, $leavename );
+function get_the_permalink( $post = 0, $leavename = false ) {
-}
+	return get_permalink( $post, $leavename );
+}
-/**
-* Retrieve full permalink for current post or post ID.
+/**
+* Retrieves the full permalink for the current post or post ID.
 *
 * @since 1.0.0
 *
-* @param int|WP_Post $id        Optional. Post ID or post object. Default current post.
+* @param int|WP_Post $post      Optional. Post ID or post object. Default is the global `$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.
+* @return string|false The permalink URL or false if post does not exist.
 */
-function get_permalink( $id = 0, $leavename = false ) {
+function get_permalink( $post = 0, $leavename = false ) {
 	$rewritecode = array(
 		'%year%',
 		'%monthnum%',
 		'%day%',
 		'%hour%',
 		'%category%',
 		'%author%',
 		$leavename? '' : '%pagename%',
 	);
-	if ( is_object($id) && isset($id->filter) && 'sample' == $id->filter ) {
+	if ( is_object( $post ) && isset( $post->filter ) && 'sample' == $post->filter ) {
-		$post = $id;
 		$sample = true;
 	} else {
-		$post = get_post($id);
+		$post = get_post( $post );
 		$sample = false;
 	}
 	if ( empty($post->ID) )
 		return false;
 		return get_post_permalink($post, $leavename, $sample);
 	$permalink = get_option('permalink_structure');
 	/**
-	 * Filter the permalink structure for a post before token replacement occurs.
+	 * Filters the permalink structure for a post before token replacement occurs.
 	 *
 	 * Only applies to posts with post_type of 'post'.
 	 *
 	 * @since 3.0.0
 	 *
 		$category = '';
 		if ( strpos($permalink, '%category%') !== false ) {
 			$cats = get_the_category($post->ID);
 			if ( $cats ) {
-				usort($cats, '_usort_terms_by_ID'); // order by ID
+				$cats = wp_list_sort( $cats, array(
+					'term_id' => 'ASC',
+				) );
 				/**
-				 * Filter the category that gets used in the %category% permalink token.
+				 * Filters 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 WP_Term  $cat  The category to use in the permalink.
-				 * @param array    $cats Array of all categories associated with the post.
+				 * @param array    $cats Array of all categories (WP_Term objects) 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( $category_object, 'category' );
 			}
 			// show default category in permalinks, without
 			// having to assign it explicitly
 			if ( empty($category) ) {
 				$default_category = get_term( get_option( 'default_category' ), 'category' );
-				$category = is_wp_error( $default_category ) ? '' : $default_category->slug;
+				if ( $default_category && ! is_wp_error( $default_category ) ) {
+					$category = $default_category->slug;
+				}
 			}
 		}
 		$author = '';
 		if ( strpos($permalink, '%author%') !== false ) {
 	} else { // if they're not using the fancy permalink option
 		$permalink = home_url('?p=' . $post->ID);
 	}
 	/**
-	 * Filter the permalink for a post.
+	 * Filters the permalink for a post.
 	 *
 	 * Only applies to posts with post_type of 'post'.
 	 *
 	 * @since 1.5.0
 	 *
 	 */
 	return apply_filters( 'post_link', $permalink, $post, $leavename );
 }
 /**
-* Retrieve the permalink for a post with a custom post type.
+* Retrieves the permalink for a post of a custom post type.
 *
 * @since 3.0.0
 *
-* @param int $id Optional. Post ID.
+* @global WP_Rewrite $wp_rewrite
-* @param bool $leavename Optional, defaults to false. Whether to keep post name.
+*
-* @param bool $sample Optional, defaults to false. Is it a sample permalink.
+* @param int|WP_Post $id        Optional. Post ID or post object. Default is the global `$post`.
-* @return string The post permalink.
+* @param bool        $leavename Optional, defaults to false. Whether to keep post name. Default false.
+* @param bool        $sample    Optional, defaults to false. Is it a sample permalink. Default false.
+* @return string|WP_Error The post permalink.
 */
 function get_post_permalink( $id = 0, $leavename = false, $sample = false ) {
 	global $wp_rewrite;
 	$post = get_post($id);
 	$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', 'future' ) );
+	$draft_or_pending = get_post_status( $post ) && in_array( get_post_status( $post ), array( 'draft', 'pending', 'auto-draft', 'future' ) );
 	$post_type = get_post_type_object($post->post_type);
 	if ( $post_type->hierarchical ) {
-		$slug = get_page_uri( $id );
+		$slug = get_page_uri( $post );
 	}
 	if ( !empty($post_link) && ( !$draft_or_pending || $sample ) ) {
 		if ( ! $leavename ) {
 			$post_link = str_replace("%$post->post_type%", $slug, $post_link);
 			$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.
+	 * Filters the permalink for a post of a custom post type.
 	 *
 	 * @since 3.0.0
 	 *
 	 * @param string  $post_link The post's permalink.
 	 * @param WP_Post $post      The post in question.
 	 */
 	return apply_filters( 'post_type_link', $post_link, $post, $leavename, $sample );
 }
 /**
-* Retrieve permalink from post ID.
+* Retrieves the permalink for the current page or page 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 int|WP_Post $post      Optional. Post ID or object. Default uses the global `$post`.
-* @param bool $leavename Optional, defaults to false. Whether to keep page name.
+* @param bool        $leavename Optional. Whether to keep the page name. Default false.
-* @param bool $sample Optional, defaults to false. Is it a sample permalink.
+* @param bool        $sample    Optional. Whether it should be treated as a sample permalink.
+*                               Default false.
 * @return string The page permalink.
 */
 function get_page_link( $post = false, $leavename = false, $sample = false ) {
 	$post = get_post( $post );
 		$link = home_url('/');
 	else
 		$link = _get_page_link( $post, $leavename, $sample );
 	/**
-	 * Filter the permalink for a page.
+	 * Filters 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.
 	 */
 	return apply_filters( 'page_link', $link, $post->ID, $sample );
 }
 /**
-* Retrieve the page permalink.
+* Retrieves 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.
+* @global WP_Rewrite $wp_rewrite
-* @param bool $leavename Optional. Leave name.
+*
-* @param bool $sample Optional. Sample permalink.
+* @param int|WP_Post $post      Optional. Post ID or object. Default uses the global `$post`.
+* @param bool        $leavename Optional. Whether to keep the page name. Default false.
+* @param bool        $sample    Optional. Whether it should be treated as a sample permalink.
+*                               Default false.
 * @return string The page permalink.
 */
 function _get_page_link( $post = false, $leavename = false, $sample = false ) {
 	global $wp_rewrite;
 	} else {
 		$link = home_url( '?page_id=' . $post->ID );
 	}
 	/**
-	 * Filter the permalink for a non-page_on_front page.
+	 * Filters 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.
+* Retrieves the permalink for an 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.
+* @global WP_Rewrite $wp_rewrite
-* @param bool $leavename Optional. Leave name.
+*
+* @param int|object $post      Optional. Post ID or object. Default uses the global `$post`.
+* @param bool       $leavename Optional. Whether to keep the page name. Default false.
 * @return string The attachment permalink.
 */
 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 ( $parent && ! in_array( $parent->post_type, get_post_types() ) ) {
+		$parent = false;
+	}
 	if ( $wp_rewrite->using_permalinks() && $parent ) {
 		if ( 'page' == $parent->post_type )
 			$parentlink = _get_page_link( $post->post_parent ); // Ignores page_on_front
 		else
 		if ( strpos($parentlink, '?') === false )
 			$link = user_trailingslashit( trailingslashit($parentlink) . '%postname%' );
 		if ( ! $leavename )
 			$link = str_replace( '%postname%', $name, $link );
+	} elseif ( $wp_rewrite->using_permalinks() && ! $leavename ) {
+		$link = home_url( user_trailingslashit( $post->post_name ) );
 	}
 	if ( ! $link )
 		$link = home_url( '/?attachment_id=' . $post->ID );
 	/**
-	 * Filter the permalink for an attachment.
+	 * Filters 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.
+* Retrieves the permalink for the year archives.
 *
 * @since 1.5.0
+*
+* @global WP_Rewrite $wp_rewrite
 *
 * @param int|bool $year False for current year or year for permalink.
 * @return string The permalink for the specified year archive.
 */
-function get_year_link($year) {
+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) ) {
 	} else {
 		$yearlink = home_url( '?m=' . $year );
 	}
 	/**
-	 * Filter the year archive permalink.
+	 * Filters 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.
+* Retrieves the permalink for the month archives with year.
 *
 * @since 1.0.0
 *
-* @param bool|int $year False for current year. Integer of year.
+* @global WP_Rewrite $wp_rewrite
+*
+* @param bool|int $year  False for current year. Integer of year.
 * @param bool|int $month False for current month. Integer of month.
 * @return string The permalink for the specified month and year archive.
 */
 function get_month_link($year, $month) {
 	global $wp_rewrite;
 	} else {
 		$monthlink = home_url( '?m=' . $year . zeroise( $month, 2 ) );
 	}
 	/**
-	 * Filter the month archive permalink.
+	 * Filters the month archive permalink.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param string $monthlink Permalink for the month archive.
 	 * @param int    $year      Year for the archive.
 	 */
 	return apply_filters( 'month_link', $monthlink, $year, $month );
 }
 /**
-* Retrieve the permalink for the day archives with year and month.
+* Retrieves 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.
+* @global WP_Rewrite $wp_rewrite
+*
+* @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.
+* @param bool|int $day   False for current day. Integer of day.
 * @return string The permalink for the specified day, month, and year archive.
 */
 function get_day_link($year, $month, $day) {
 	global $wp_rewrite;
 	if ( !$year )
 	} else {
 		$daylink = home_url( '?m=' . $year . zeroise( $month, 2 ) . zeroise( $day, 2 ) );
 	}
 	/**
-	 * Filter the day archive permalink.
+	 * Filters the day archive permalink.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param string $daylink Permalink for the day archive.
 	 * @param int    $year    Year for the archive.
 	 */
 	return apply_filters( 'day_link', $daylink, $year, $month, $day );
 }
 /**
-* Display the permalink for the feed type.
+* Displays 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.
+* @param string $feed   Optional. Feed type. Default empty.
 */
 function the_feed_link( $anchor, $feed = '' ) {
 	$link = '<a href="' . esc_url( get_feed_link( $feed ) ) . '">' . $anchor . '</a>';
 	/**
-	 * Filter the feed link anchor tag.
+	 * Filters 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
 	 */
 	echo apply_filters( 'the_feed_link', $link, $feed );
 }
 /**
-* Retrieve the permalink for the feed type.
+* Retrieves the permalink for the feed type.
 *
 * @since 1.5.0
 *
-* @param string $feed Optional, defaults to default feed. Feed type.
+* @global WP_Rewrite $wp_rewrite
+*
+* @param string $feed Optional. Feed type. Default empty.
 * @return string The feed permalink.
 */
-function get_feed_link($feed = '') {
+function get_feed_link( $feed = '' ) {
 	global $wp_rewrite;
 	$permalink = $wp_rewrite->get_feed_permastruct();
 	if ( '' != $permalink ) {
 		if ( false !== strpos($feed, 'comments_') ) {
 		$output = home_url("?feed={$feed}");
 	}
 	/**
-	 * Filter the feed type permalink.
+	 * Filters 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.
+* Retrieves the permalink for the post comments feed.
 *
 * @since 2.2.0
 *
-* @param int $post_id Optional. Post ID.
+* @param int    $post_id Optional. Post ID. Default is the ID of the global `$post`.
-* @param string $feed Optional. Feed type.
+* @param string $feed    Optional. Feed type. Default empty.
 * @return string The permalink for the comments feed for the given post.
 */
-function get_post_comments_feed_link($post_id = 0, $feed = '') {
+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();
+	$post = get_post( $post_id );
+	$unattached = 'attachment' === $post->post_type && 0 === (int) $post->post_parent;
 	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 ( $unattached ) {
-		if ( $feed != get_default_feed() )
+			$url =  home_url( '/feed/' );
-			$url .= "/$feed";
+			if ( $feed !== get_default_feed() ) {
-		$url = user_trailingslashit($url, 'single_feed');
+				$url .= "$feed/";
+			}
+			$url = add_query_arg( 'attachment_id', $post_id, $url );
+		} else {
+			$url = trailingslashit($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 ( $unattached ) {
-		if ( 'page' == $type )
+			$url = add_query_arg( array( 'feed' => $feed, 'attachment_id' => $post_id ), home_url( '/' ) );
+		} elseif ( 'page' == $post->post_type ) {
 			$url = add_query_arg( array( 'feed' => $feed, 'page_id' => $post_id ), home_url( '/' ) );
-		else
+		} else {
 			$url = add_query_arg( array( 'feed' => $feed, 'p' => $post_id ), home_url( '/' ) );
-	}
+		}
+	}
-	/**
-	 * Filter the post comments feed permalink.
+	/**
+	 * Filters 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.
+* Displays 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 string $link_text Optional. Descriptive link text. Default 'Comments Feed'.
-* @param int $post_id Optional post ID. Default to current post.
+* @param int    $post_id   Optional. Post ID. Default is the ID of the global `$post`.
-* @param string $feed Optional. Feed format.
+* @param string $feed      Optional. Feed format. Default empty.
-* @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 ) );
+	$url = get_post_comments_feed_link( $post_id, $feed );
-	if ( empty($link_text) )
+	if ( empty( $link_text ) ) {
 		$link_text = __('Comments Feed');
+	}
-	/**
-	 * Filter the post comment feed link anchor tag.
+	$link = '<a href="' . esc_url( $url ) . '">' . $link_text . '</a>';
+	/**
+	 * Filters 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 );
+	echo apply_filters( 'post_comments_feed_link_html', $link, $post_id, $feed );
 }
 /**
-* Retrieve the feed link for a given author.
+* Retrieves 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 int    $author_id Author ID.
-* @param string $feed Optional. Feed type.
+* @param string $feed      Optional. Feed type. Default empty.
 * @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) )
 		$link = trailingslashit($link) . user_trailingslashit($feed_link, 'feed');
 	}
 	/**
-	 * Filter the feed link for a given author.
+	 * Filters the feed link for a given author.
 	 *
 	 * @since 1.5.1
 	 *
 	 * @param string $link The author feed link.
 	 * @param string $feed Feed type.
 	return $link;
 }
 /**
-* Retrieve the feed link for a category.
+* Retrieves 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 int    $cat_id Category ID.
-* @param string $feed Optional. Feed type.
+* @param string $feed   Optional. Feed type. Default empty.
 * @return string Link to the feed for the category specified by $cat_id.
 */
-function get_category_feed_link($cat_id, $feed = '') {
+function get_category_feed_link( $cat_id, $feed = '' ) {
-	return get_term_feed_link($cat_id, 'category', $feed);
+	return get_term_feed_link( $cat_id, 'category', $feed );
 }
 /**
-* Retrieve the feed link for a term.
+* Retrieves 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 int    $term_id  Term ID.
-* @param string $taxonomy Optional. Taxonomy of $term_id
+* @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
-* @param string $feed Optional. Feed type.
+* @param string $feed     Optional. Feed type. Default empty.
-* @return string Link to the feed for the term specified by $term_id and $taxonomy.
+* @return string|false 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  );
 		$link = trailingslashit( $link ) . user_trailingslashit( $feed_link, 'feed' );
 	}
 	if ( 'category' == $taxonomy ) {
 		/**
-		 * Filter the category feed link.
+		 * Filters 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.
+		 * Filters 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'.
+		 * Filters 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.
+		 * @param string $taxonomy The taxonomy name.
 		 */
 		$link = apply_filters( 'taxonomy_feed_link', $link, $feed, $taxonomy );
 	}
 	return $link;
 }
 /**
-* Retrieve permalink for feed of tag.
+* Retrieves the permalink for a tag feed.
 *
 * @since 2.3.0
 *
-* @param int $tag_id Tag ID.
+* @param int    $tag_id Tag ID.
-* @param string $feed Optional. Feed type.
+* @param string $feed   Optional. Feed type. Default empty.
 * @return string The feed permalink for the given tag.
 */
-function get_tag_feed_link($tag_id, $feed = '') {
+function get_tag_feed_link( $tag_id, $feed = '' ) {
-	return get_term_feed_link($tag_id, 'post_tag', $feed);
+	return get_term_feed_link( $tag_id, 'post_tag', $feed );
 }
 /**
-* Retrieve edit tag link.
+* Retrieves the edit link for a tag.
 *
 * @since 2.7.0
 *
-* @param int $tag_id Tag ID
+* @param int    $tag_id   Tag ID.
-* @param string $taxonomy Taxonomy
+* @param string $taxonomy Optional. Taxonomy slug. Default 'post_tag'.
 * @return string The edit tag link URL for the given tag.
 */
 function get_edit_tag_link( $tag_id, $taxonomy = 'post_tag' ) {
 	/**
-	 * Filter the edit link for a tag (or term in another taxonomy).
+	 * Filters 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.
+* Displays or retrieves the edit link for a tag with formatting.
 *
 * @since 2.7.0
 *
-* @param string $link Optional. Anchor text.
+* @param string  $link   Optional. Anchor text. Default empty.
-* @param string $before Optional. Display before edit link.
+* @param string  $before Optional. Display before edit link. Default empty.
-* @param string $after Optional. Display after edit link.
+* @param string  $after  Optional. Display after edit link. Default empty.
-* @param object $tag Tag object.
+* @param WP_Term $tag    Optional. Term object. If null, the queried object will be inspected.
-* @return string HTML content.
+*                        Default null.
 */
 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).
+	 * Filters 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 ) . $after;
 }
 /**
-* Retrieve edit term url.
+* Retrieves the URL for editing a given term.
 *
 * @since 3.1.0
+* @since 4.5.0 The `$taxonomy` argument was made optional.
 *
 * @param int    $term_id     Term ID.
-* @param string $taxonomy    Taxonomy.
+* @param string $taxonomy    Optional. Taxonomy. Defaults to the taxonomy of the term identified
-* @param string $object_type The object type. Used to highlight the proper post type menu on the linked page.
+*                            by `$term_id`.
-*                            Defaults to the first object_type associated with the taxonomy.
+* @param string $object_type Optional. The object type. Used to highlight the proper post type
-* @return string The edit term link URL for the given term.
+*                            menu on the linked page. Defaults to the first object_type associated
-*/
+*                            with the taxonomy.
-function get_edit_term_link( $term_id, $taxonomy, $object_type = '' ) {
+* @return string|null The edit term link URL for the given term, or null on failure.
-	$tax = get_taxonomy( $taxonomy );
+*/
-	if ( !current_user_can( $tax->cap->edit_terms ) )
+function get_edit_term_link( $term_id, $taxonomy = '', $object_type = '' ) {
+	$term = get_term( $term_id, $taxonomy );
+	if ( ! $term || is_wp_error( $term ) ) {
 		return;
+	}
-	$term = get_term( $term_id, $taxonomy );
+	$tax = get_taxonomy( $term->taxonomy );
+	if ( ! $tax || ! current_user_can( 'edit_term', $term->term_id ) ) {
+		return;
+	}
 	$args = array(
-		'action' => 'edit',
 		'taxonomy' => $taxonomy,
-		'tag_ID' => $term->term_id,
+		'tag_ID'   => $term->term_id,
 	);
 	if ( $object_type ) {
 		$args['post_type'] = $object_type;
-	} else if ( ! empty( $tax->object_type ) ) {
+	} elseif ( ! empty( $tax->object_type ) ) {
 		$args['post_type'] = reset( $tax->object_type );
 	}
-	$location = add_query_arg( $args, admin_url( 'edit-tags.php' ) );
+	if ( $tax->show_ui ) {
+		$location = add_query_arg( $args, admin_url( 'term.php' ) );
-	/**
+	} else {
-	 * Filter the edit link for a term.
+		$location = '';
+	}
+	/**
+	 * Filters the edit link for a term.
 	 *
 	 * @since 3.1.0
 	 *
 	 * @param string $location    The edit link.
 	 * @param int    $term_id     Term ID.
 	 */
 	return apply_filters( 'get_edit_term_link', $location, $term_id, $taxonomy, $object_type );
 }
 /**
-* Display or retrieve edit term link with formatting.
+* Displays or retrieves the edit term link with formatting.
 *
 * @since 3.1.0
 *
-* @param string $link Optional. Anchor text.
+* @param string $link   Optional. Anchor text. Default empty.
-* @param string $before Optional. Display before edit link.
+* @param string $before Optional. Display before edit link. Default empty.
-* @param string $after Optional. Display after edit link.
+* @param string $after  Optional. Display after edit link. Default empty.
-* @param object $term Term object.
+* @param object $term   Optional. Term object. If null, the queried object will be inspected. Default null.
-* @return string HTML content.
+* @param bool   $echo   Optional. Whether or not to echo the return. Default true.
+* @return string|void 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 ) )
+	if ( ! current_user_can( 'edit_term', $term->term_id ) ) {
 		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.
+	 * Filters 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.
 	else
 		return $link;
 }
 /**
-* Retrieve permalink for search.
+* Retrieves the permalink for a search.
 *
 * @since  3.0.0
 *
-* @param string $query Optional. The query string to use. If empty the current query is used.
+* @global WP_Rewrite $wp_rewrite
+*
+* @param string $query Optional. The query string to use. If empty the current query is used. Default empty.
 * @return string The search permalink.
 */
 function get_search_link( $query = '' ) {
 	global $wp_rewrite;
 	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.
+		$search = str_replace('%2F', '/', $search); // %2F(/) is not valid within a URL, send it un-encoded.
 		$link = str_replace( '%search%', $search, $permastruct );
 		$link = home_url( user_trailingslashit( $link, 'search' ) );
 	}
 	/**
-	 * Filter the search permalink.
+	 * Filters 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.
+* Retrieves the permalink for the search results feed.
 *
 * @since 2.5.0
 *
-* @param string $search_query Optional. Search query.
+* @global WP_Rewrite $wp_rewrite
-* @param string $feed Optional. Feed type.
+*
+* @param string $search_query Optional. Search query. Default empty.
+* @param string $feed         Optional. Feed type. Default empty.
 * @return string The search results feed permalink.
 */
 function get_search_feed_link($search_query = '', $feed = '') {
 	global $wp_rewrite;
 	$link = get_search_link($search_query);
 		$link = trailingslashit($link);
 		$link .= "feed/$feed/";
 	}
 	/**
-	 * Filter the search feed link.
+	 * Filters 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 apply_filters( 'search_feed_link', $link, $feed, 'posts' );
+}
-	return $link;
-}
+/**
+* Retrieves the permalink for the search results comments feed.
-/**
-* Retrieve the permalink for the comments feed of the search results.
 *
 * @since 2.5.0
 *
-* @param string $search_query Optional. Search query.
+* @global WP_Rewrite $wp_rewrite
-* @param string $feed Optional. Feed type.
+*
+* @param string $search_query Optional. Search query. Default empty.
+* @param string $feed         Optional. Feed type. Default empty.
 * @return string The comments feed search results permalink.
 */
 function get_search_comments_feed_link($search_query = '', $feed = '') {
 	global $wp_rewrite;
 		$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 apply_filters( 'search_feed_link', $link, $feed, 'comments' );
+}
-	return $link;
-}
+/**
+* Retrieves the permalink for a post type archive.
-/**
-* Retrieve the permalink for a post type archive.
 *
 * @since 3.1.0
-*
+* @since 4.5.0 Support for posts was added.
-* @param string $post_type Post type
+*
-* @return string The post type archive permalink.
+* @global WP_Rewrite $wp_rewrite
+*
+* @param string $post_type Post type.
+* @return string|false The post type archive permalink.
 */
 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' === $post_type ) {
+		$show_on_front = get_option( 'show_on_front' );
+		$page_for_posts  = get_option( 'page_for_posts' );
+		if ( 'page' == $show_on_front && $page_for_posts ) {
+			$link = get_permalink( $page_for_posts );
+		} else {
+			$link = get_home_url();
+		}
+		/** This filter is documented in wp-includes/link-template.php */
+		return apply_filters( 'post_type_archive_link', $link, $post_type );
+	}
 	if ( ! $post_type_obj->has_archive )
 		return false;
 	if ( get_option( 'permalink_structure' ) && is_array( $post_type_obj->rewrite ) ) {
 	} else {
 		$link = home_url( '?post_type=' . $post_type );
 	}
 	/**
-	 * Filter the post type archive permalink.
+	 * Filters 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.
+* Retrieves the permalink for a post type archive feed.
 *
 * @since 3.1.0
 *
 * @param string $post_type Post type
-* @param string $feed Optional. Feed type
+* @param string $feed      Optional. Feed type. Default empty.
-* @return string The post type feed permalink.
+* @return string|false The post type feed permalink.
 */
 function get_post_type_archive_feed_link( $post_type, $feed = '' ) {
 	$default_feed = get_default_feed();
 	if ( empty( $feed ) )
 		$feed = $default_feed;
 	} else {
 		$link = add_query_arg( 'feed', $feed, $link );
 	}
 	/**
-	 * Filter the post type archive feed link.
+	 * Filters 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.
+* Retrieves the URL used for the post preview.
+*
+* Allows additional query args to be appended.
+*
+* @since 4.4.0
+*
+* @param int|WP_Post $post         Optional. Post ID or `WP_Post` object. Defaults to global `$post`.
+* @param array       $query_args   Optional. Array of additional query args to be appended to the link.
+*                                  Default empty array.
+* @param string      $preview_link Optional. Base preview link to be used if it should differ from the
+*                                  post permalink. Default empty.
+* @return string|null URL used for the post preview, or null if the post does not exist.
+*/
+function get_preview_post_link( $post = null, $query_args = array(), $preview_link = '' ) {
+	$post = get_post( $post );
+	if ( ! $post ) {
+		return;
+	}
+	$post_type_object = get_post_type_object( $post->post_type );
+	if ( is_post_type_viewable( $post_type_object ) ) {
+		if ( ! $preview_link ) {
+			$preview_link = set_url_scheme( get_permalink( $post ) );
+		}
+		$query_args['preview'] = 'true';
+		$preview_link = add_query_arg( $query_args, $preview_link );
+	}
+	/**
+	 * Filters the URL used for a post preview.
+	 *
+	 * @since 2.0.5
+	 * @since 4.0.0 Added the `$post` parameter.
+	 *
+	 * @param string  $preview_link URL used for the post preview.
+	 * @param WP_Post $post         Post object.
+	 */
+	return apply_filters( 'preview_post_link', $preview_link, $post );
+}
+/**
+* Retrieves the edit post 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 int|WP_Post $id      Optional. Post ID or post object. Default is the global `$post`.
-* @param string $context Optional, defaults to display. How to write the '&', defaults to '&amp;'.
+* @param string      $context Optional. How to output the '&' character. Default '&amp;'.
-* @return string The edit post link for the given post.
+* @return string|null The edit post link for the given post. null if the post type is invalid or does
+*                     not allow an editing UI.
 */
 function get_edit_post_link( $id = 0, $context = 'display' ) {
 	if ( ! $post = get_post( $id ) )
 		return;
 		return;
 	if ( !current_user_can( 'edit_post', $post->ID ) )
 		return;
-	/**
+	if ( $post_type_object->_edit_link ) {
-	 * Filter the post edit link.
+		$link = admin_url( sprintf( $post_type_object->_edit_link . $action, $post->ID ) );
+	} else {
+		$link = '';
+	}
+	/**
+	 * Filters 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 );
+	return apply_filters( 'get_edit_post_link', $link, $post->ID, $context );
 }
 /**
-* Display edit post link for post.
+* Displays the edit post link for post.
 *
 * @since 1.0.0
-*
+* @since 4.4.0 The `$class` argument was added.
-* @param string $text Optional. Anchor text.
+*
-* @param string $before Optional. Display before edit link.
+* @param string      $text   Optional. Anchor text. If null, default is 'Edit This'. Default null.
-* @param string $after Optional. Display after edit link.
+* @param string      $before Optional. Display before edit link. Default empty.
-* @param int $id Optional. Post ID.
+* @param string      $after  Optional. Display after edit link. Default empty.
-*/
+* @param int|WP_Post $id     Optional. Post ID or post object. Default is the global `$post`.
-function edit_post_link( $text = null, $before = '', $after = '', $id = 0 ) {
+* @param string      $class  Optional. Add custom class to link. Default 'post-edit-link'.
+*/
+function edit_post_link( $text = null, $before = '', $after = '', $id = 0, $class = 'post-edit-link' ) {
 	if ( ! $post = get_post( $id ) ) {
 		return;
 	}
 	if ( ! $url = get_edit_post_link( $post->ID ) ) {
 	if ( null === $text ) {
 		$text = __( 'Edit This' );
 	}
-	$link = '<a class="post-edit-link" href="' . $url . '">' . $text . '</a>';
+	$link = '<a class="' . esc_attr( $class ) . '" href="' . esc_url( $url ) . '">' . $text . '</a>';
 	/**
-	 * Filter the post edit link anchor tag.
+	 * Filters 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.
 	 */
 	echo $before . apply_filters( 'edit_post_link', $link, $post->ID, $text ) . $after;
 }
 /**
-* Retrieve delete posts link for post.
+* Retrieves the 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 int|WP_Post $id           Optional. Post ID or post object. Default is the global `$post`.
-* @param string $deprecated Not used.
+* @param string      $deprecated   Not used.
-* @param bool $force_delete Whether to bypass trash and force deletion. Default is false.
+* @param bool        $force_delete Optional. Whether to bypass trash and force deletion. Default false.
-* @return string The delete post link URL for the given post.
+* @return string|void The delete post link URL for the given post.
 */
 function get_delete_post_link( $id = 0, $deprecated = '', $force_delete = false ) {
 	if ( ! empty( $deprecated ) )
-		_deprecated_argument( __FUNCTION__, '3.0' );
+		_deprecated_argument( __FUNCTION__, '3.0.0' );
 	if ( !$post = get_post( $id ) )
 		return;
 	$post_type_object = get_post_type_object( $post->post_type );
 	$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.
+	 * Filters the post delete link.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param string $link         The delete link.
 	 * @param int    $post_id      Post ID.
 	 */
 	return apply_filters( 'get_delete_post_link', wp_nonce_url( $delete_link, "$action-post_{$post->ID}" ), $post->ID, $force_delete );
 }
 /**
-* Retrieve edit comment link.
+* Retrieves the edit comment link.
 *
 * @since 2.3.0
 *
-* @param int $comment_id Optional. Comment ID.
+* @param int|WP_Comment $comment_id Optional. Comment ID or WP_Comment object.
-* @return string The edit comment link URL for the given comment.
+* @return string|void The edit comment link URL for the given comment.
 */
 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.
+	 * Filters 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.
+* Displays the edit comment link with formatting.
 *
 * @since 1.0.0
 *
-* @param string $text Optional. Anchor text.
+* @param string $text   Optional. Anchor text. If null, default is 'Edit This'. Default null.
-* @param string $before Optional. Display before edit link.
+* @param string $before Optional. Display before edit link. Default empty.
-* @param string $after Optional. Display after edit link.
+* @param string $after  Optional. Display after edit link. Default empty.
 */
 function edit_comment_link( $text = null, $before = '', $after = '' ) {
-	global $comment;
+	$comment = get_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>';
+	$link = '<a class="comment-edit-link" href="' . esc_url( get_edit_comment_link( $comment ) ) . '">' . $text . '</a>';
 	/**
-	 * Filter the comment edit link anchor tag.
+	 * Filters 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.
 	 */
 	echo $before . apply_filters( 'edit_comment_link', $link, $comment->comment_ID, $text ) . $after;
 }
 /**
-* Display edit bookmark (literally a URL external to blog) link.
+* Displays the edit bookmark link.
 *
 * @since 2.7.0
 *
-* @param int|stdClass $link Optional. Bookmark ID.
+* @param int|stdClass $link Optional. Bookmark ID. Default is the id of the current bookmark.
-* @return string The edit bookmark link URL.
+* @return string|void The edit bookmark link URL.
 */
 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.
+	 * Filters the bookmark 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.
+* Displays the edit bookmark link anchor content.
 *
 * @since 2.7.0
 *
-* @param string $link Optional. Anchor text.
+* @param string $link     Optional. Anchor text. Default empty.
-* @param string $before Optional. Display before edit link.
+* @param string $before   Optional. Display before edit link. Default empty.
-* @param string $after Optional. Display after edit link.
+* @param string $after    Optional. Display after edit link. Default empty.
-* @param int $bookmark Optional. Bookmark ID.
+* @param int    $bookmark Optional. Bookmark ID. Default is the current bookmark.
 */
 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>';
+	$link = '<a href="' . esc_url( get_edit_bookmark_link( $bookmark ) ) . '">' . $link . '</a>';
 	/**
-	 * Filter the bookmark edit link anchor tag.
+	 * Filters 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
+* Retrieves the 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.
 		$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.
+	 * Filters the user edit link.
 	 *
 	 * @since 3.5.0
 	 *
 	 * @param string $link    The edit link.
 	 * @param int    $user_id User ID.
 }
 // Navigation links
 /**
-* Retrieve previous post that is adjacent to current post.
+* Retrieves the previous post that is adjacent to the current post.
 *
 * @since 1.5.0
 *
-* @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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.
+* @return null|string|WP_Post 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.
+* Retrieves the next post that is adjacent to the current post.
 *
 * @since 1.5.0
 *
-* @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether post should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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.
+* @return null|string|WP_Post 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.
+* Retrieves the 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.
+* @global wpdb $wpdb WordPress database abstraction object.
-* @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 bool         $in_same_term   Optional. Whether post should be in a same taxonomy term. Default false.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
+* @param bool         $previous       Optional. Whether to retrieve previous post. Default true
 * @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.
+* @return null|string|WP_Post 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 ) )
 	$current_post_date = $post->post_date;
 	$join = '';
 	$where = '';
+	$adjacent = $previous ? 'previous' : 'next';
 	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'" ) );
+				_deprecated_argument( __FUNCTION__, '3.3.0', 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 ) {
+			$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 ( ! 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.
 				return '';
 			$where .= " AND tt.term_id IN (" . implode( ',', $term_array ) . ")";
 		}
+		/**
+		 * Filters the IDs of terms excluded from adjacent post queries.
+		 *
+		 * The dynamic portion of the hook name, `$adjacent`, refers to the type
+		 * of adjacency, 'next' or 'previous'.
+		 *
+		 * @since 4.4.0
+		 *
+		 * @param string $excluded_terms Array of excluded term IDs.
+		 */
+		$excluded_terms = apply_filters( "get_{$adjacent}_post_excluded_terms", $excluded_terms );
 		if ( ! empty( $excluded_terms ) ) {
-			$where .= " AND p.ID NOT IN ( SELECT tr.object_id FROM $wpdb->term_relationships tr LEFT JOIN $wpdb->term_taxonomy tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id) WHERE tt.term_id IN (" . implode( $excluded_terms, ',' ) . ') )';
+			$where .= " AND p.ID NOT IN ( SELECT tr.object_id FROM $wpdb->term_relationships tr LEFT JOIN $wpdb->term_taxonomy tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id) WHERE tt.term_id IN (" . implode( ',', array_map( 'intval', $excluded_terms ) ) . ') )';
 		}
 	}
 	// 'post_status' clause depends on the current user.
 	if ( is_user_logged_in() ) {
 		$where .= " )";
 	} else {
 		$where .= " AND p.post_status = 'publish'";
 	}
-	$adjacent = $previous ? 'previous' : 'next';
 	$op = $previous ? '<' : '>';
 	$order = $previous ? 'DESC' : 'ASC';
 	/**
-	 * Filter the JOIN clause in the SQL for an adjacent post query.
+	 * Filters the JOIN clause in the SQL for an adjacent post query.
 	 *
 	 * The dynamic portion of the hook name, `$adjacent`, refers to the type
 	 * of adjacency, 'next' or 'previous'.
 	 *
 	 * @since 2.5.0
-	 *
+	 * @since 4.4.0 Added the `$taxonomy` and `$post` parameters.
-	 * @param string $join           The JOIN clause in the SQL.
+	 *
-	 * @param bool   $in_same_term   Whether post should be in a same taxonomy term.
+	 * @param string  $join           The JOIN clause in the SQL.
-	 * @param array  $excluded_terms Array of excluded term IDs.
+	 * @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 );
+	 * @param string  $taxonomy       Taxonomy. Used to identify the term used when `$in_same_term` is true.
+	 * @param WP_Post $post           WP_Post object.
-	/**
+	 */
-	 * Filter the WHERE clause in the SQL for an adjacent post query.
+	$join = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms, $taxonomy, $post );
+	/**
+	 * Filters the WHERE clause in the SQL for an adjacent post query.
 	 *
 	 * The dynamic portion of the hook name, `$adjacent`, refers to the type
 	 * of adjacency, 'next' or 'previous'.
 	 *
 	 * @since 2.5.0
-	 *
+	 * @since 4.4.0 Added the `$taxonomy` and `$post` parameters.
-	 * @param string $where          The `WHERE` clause in the SQL.
+	 *
-	 * @param bool   $in_same_term   Whether post should be in a same taxonomy term.
+	 * @param string  $where          The `WHERE` clause in the SQL.
-	 * @param array  $excluded_terms Array of excluded term IDs.
+	 * @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 $where", $current_post_date, $post->post_type ), $in_same_term, $excluded_terms );
+	 * @param string  $taxonomy       Taxonomy. Used to identify the term used when `$in_same_term` is true.
+	 * @param WP_Post $post           WP_Post object.
-	/**
+	 */
-	 * Filter the ORDER BY clause in the SQL for an adjacent post query.
+	$where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s $where", $current_post_date, $post->post_type ), $in_same_term, $excluded_terms, $taxonomy, $post );
+	/**
+	 * Filters the ORDER BY clause in the SQL for an adjacent post query.
 	 *
 	 * The dynamic portion of the hook name, `$adjacent`, refers to the type
 	 * of adjacency, 'next' or 'previous'.
 	 *
 	 * @since 2.5.0
+	 * @since 4.4.0 Added the `$post` parameter.
+	 * @since 4.9.0 Added the `$order` parameter.
 	 *
 	 * @param string $order_by The `ORDER BY` clause in the SQL.
-	 */
+	 * @param WP_Post $post    WP_Post object.
-	$sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
+	 * @param string  $order   Sort order. 'DESC' for previous post, 'ASC' for next.
+	 */
+	$sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post, $order );
 	$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 ) {
 	return $result;
 }
 /**
-* Get adjacent post relational link.
+* Retrieves the 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 string       $title          Optional. Link title format. Default '%title'.
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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 The adjacent post relational link URL.
+* @return string|void The adjacent post relational link URL.
 */
 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
 	$link .= "' href='" . get_permalink( $post ) . "' />\n";
 	$adjacent = $previous ? 'previous' : 'next';
 	/**
-	 * Filter the adjacent post relational link.
+	 * Filters the adjacent post relational link.
 	 *
 	 * The dynamic portion of the hook name, `$adjacent`, refers to the type
 	 * of adjacency, 'next' or 'previous'.
 	 *
 	 * @since 2.8.0
 	 */
 	return apply_filters( "{$adjacent}_post_rel_link", $link );
 }
 /**
-* Display relational links for the posts adjacent to the current post.
+* Displays the relational links for the posts adjacent to the current post.
 *
 * @since 2.8.0
 *
-* @param string       $title          Optional. Link title format.
+* @param string       $title          Optional. Link title format. Default '%title'.
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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.
+* Displays 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.
+* 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
 *
+* @see adjacent_posts_rel_link()
 */
 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.
+* Displays the relational link for the next post adjacent to the current post.
 *
 * @since 2.8.0
 *
-* @param string       $title          Optional. Link title format.
+* @see get_adjacent_post_rel_link()
-* @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       $title          Optional. Link title format. Default '%title'.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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.
+* Displays the relational link for the previous post adjacent to the current post.
 *
 * @since 2.8.0
 *
-* @param string       $title          Optional. Link title format.
+* @see get_adjacent_post_rel_link()
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+*
+* @param string       $title          Optional. Link title format. Default '%title'.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
 * @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.
+* Retrieves the 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.
+*                                     Default false.
 * @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.
+*                                     Default empty.
+* @param bool         $start          Optional. Whether to retrieve first or last post. Default true
 * @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.
+* @return null|array 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;
 	}
 	return get_posts( $query_args );
 }
-/*
+/**
-* Get previous post link that is adjacent to the current post.
+* Retrieves the previous post link that is adjacent to the current post.
 *
 * @since 3.7.0
 *
-* @param string       $format         Optional. Link anchor format.
+* @param string       $format         Optional. Link anchor format. Default '&laquo; %link'.
-* @param string       $link           Optional. Link permalink format.
+* @param string       $link           Optional. Link permalink format. Default '%title'.
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string The link URL of the previous post in relation to the current post.
 */
 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.
+* Displays the 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       $format         Optional. Link anchor format. Default '&laquo; %link'.
-* @param string       $link           Optional. Link permalink format.
+* @param string       $link           Optional. Link permalink format. Default '%title'.
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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.
+* Retrieves the next post link that is adjacent to the current post.
 *
 * @since 3.7.0
 *
-* @param string       $format         Optional. Link anchor format.
+* @param string       $format         Optional. Link anchor format. Default '&laquo; %link'.
-* @param string       $link           Optional. Link permalink format.
+* @param string       $link           Optional. Link permalink format. Default '%title'.
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @param string       $taxonomy       Optional. Taxonomy, if $in_same_term is true. Default 'category'.
 * @return string The link URL of the next post in relation to the current post.
 */
 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.
+* Displays the 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       $format         Optional. Link anchor format. Default '&laquo; %link'.
-* @param string       $link           Optional. Link permalink format.
+* @param string       $link           Optional. Link permalink format. Default '%title'
-* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term.
+* @param bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded term IDs. Default empty.
 * @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.
+* Retrieves the 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 bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded terms IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded terms IDs. Default empty.
 * @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 The link URL of the previous or next post in relation to the current post.
 */
 function get_adjacent_post_link( $format, $link, $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
 	}
 	$adjacent = $previous ? 'previous' : 'next';
 	/**
-	 * Filter the adjacent post link.
+	 * Filters the adjacent post link.
 	 *
 	 * The dynamic portion of the hook name, `$adjacent`, refers to the type
 	 * of adjacency, 'next' or 'previous'.
 	 *
 	 * @since 2.6.0
 	 */
 	return apply_filters( "{$adjacent}_post_link", $output, $format, $link, $post, $adjacent );
 }
 /**
-* Display adjacent post link.
+* Displays the adjacent post link.
 *
 * Can be either next post link or previous.
 *
 * @since 2.5.0
 *
 * @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 bool         $in_same_term   Optional. Whether link should be in a same taxonomy term. Default false.
-* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded category IDs.
+* @param array|string $excluded_terms Optional. Array or comma-separated list of excluded category IDs. Default empty.
 * @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'.
 */
 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.
+* Retrieves the link for a page number.
 *
 * @since 1.5.0
 *
-* @param int $pagenum Optional. Page ID.
+* @global WP_Rewrite $wp_rewrite
-* @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().
+* @param int  $pagenum Optional. Page ID. Default 1.
+* @param bool $escape  Optional. Whether to escape the URL for display, with esc_url(). Defaults to true.
+* 	                    Otherwise, prepares the URL with esc_url_raw().
 * @return string The link URL for the given page number.
 */
 function get_pagenum_link($pagenum = 1, $escape = true ) {
 	global $wp_rewrite;
 		$result = $base . $request . $query_string;
 	}
 	/**
-	 * Filter the page number link for the current request.
+	 * Filters the page number link for the current request.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param string $result The page number link.
 	 */
 	else
 		return esc_url_raw( $result );
 }
 /**
-* Retrieve next posts page link.
+* Retrieves the next posts page link.
 *
 * Backported from 2.1.3 to 2.0.10.
 *
 * @since 2.0.10
 *
-* @param int $max_page Optional. Max pages.
+* @global int $paged
-* @return string The link URL for next posts page.
+*
+* @param int $max_page Optional. Max pages. Default 0.
+* @return string|void The link URL for next posts page.
 */
 function get_next_posts_page_link($max_page = 0) {
 	global $paged;
 	if ( !is_single() ) {
 			return get_pagenum_link($nextpage);
 	}
 }
 /**
-* Display or return the next posts page link.
+* Displays or retrieves the next posts page link.
 *
 * @since 0.71
 *
-* @param int $max_page Optional. Max pages.
+* @param int   $max_page Optional. Max pages. Default 0.
-* @param boolean $echo Optional. Echo or return;
+* @param bool  $echo     Optional. Whether to echo the link. Default true.
-* @return string The link URL for next posts page if `$echo = false`.
+* @return string|void The link URL for next posts page if `$echo = false`.
 */
 function next_posts( $max_page = 0, $echo = true ) {
 	$output = esc_url( get_next_posts_page_link( $max_page ) );
 	if ( $echo )
 	else
 		return $output;
 }
 /**
-* Return the next posts page link.
+* Retrieves the next posts page link.
 *
 * @since 2.7.0
 *
-* @param string $label Content for link text.
+* @global int      $paged
-* @param int $max_page Optional. Max pages.
+* @global WP_Query $wp_query
-* @return string|null HTML-formatted next posts page link.
+*
+* @param string $label    Content for link text.
+* @param int    $max_page Optional. Max pages. Default 0.
+* @return string|void HTML-formatted next posts page link.
 */
 function get_next_posts_link( $label = null, $max_page = 0 ) {
 	global $paged, $wp_query;
 	if ( !$max_page )
 	if ( null === $label )
 		$label = __( 'Next Page &raquo;' );
 	if ( !is_single() && ( $nextpage <= $max_page ) ) {
 		/**
-		 * Filter the anchor tag attributes for the next posts page link.
+		 * Filters the anchor tag attributes for the next posts page link.
 		 *
 		 * @since 2.7.0
 		 *
 		 * @param string $attributes Attributes for the anchor tag.
 		 */
 		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.
+* Displays the next posts page link.
 *
 * @since 0.71
 *
-* @param string $label Content for link text.
+* @param string $label    Content for link text.
-* @param int $max_page Optional. Max pages.
+* @param int    $max_page Optional. Max pages. Default 0.
 */
 function next_posts_link( $label = null, $max_page = 0 ) {
 	echo get_next_posts_link( $label, $max_page );
 }
 /**
-* Retrieve previous posts page link.
+* Retrieves the 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 The link for the previous posts page.
+* @global int $paged
+*
+* @return string|void The link for the previous posts page.
 */
 function get_previous_posts_page_link() {
 	global $paged;
 	if ( !is_single() ) {
 		return get_pagenum_link($nextpage);
 	}
 }
 /**
-* Display or return the previous posts page link.
+* Displays or retrieves the previous posts page link.
 *
 * @since 0.71
 *
-* @param boolean $echo Optional. Echo or return;
+* @param bool $echo Optional. Whether to echo the link. Default true.
-* @return string The previous posts page link if `$echo = false`.
+* @return string|void The previous posts page link if `$echo = false`.
 */
 function previous_posts( $echo = true ) {
 	$output = esc_url( get_previous_posts_page_link() );
 	if ( $echo )
 	else
 		return $output;
 }
 /**
-* Return the previous posts page link.
+* Retrieves the previous posts page link.
 *
 * @since 2.7.0
 *
+* @global int $paged
+*
 * @param string $label Optional. Previous page link text.
-* @return string|null HTML-formatted previous page link.
+* @return string|void HTML-formatted previous page link.
 */
 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.
+		 * Filters the anchor tag attributes for the previous posts page link.
 		 *
 		 * @since 2.7.0
 		 *
 		 * @param string $attributes Attributes for the anchor tag.
 		 */
 		return '<a href="' . previous_posts( false ) . "\" $attr>". preg_replace( '/&([^#])(?![a-z]{1,8};)/i', '&#038;$1', $label ) .'</a>';
 	}
 }
 /**
-* Display the previous posts page link.
+* Displays the previous posts page link.
 *
 * @since 0.71
 *
 * @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.
+* Retrieves the post pages link navigation for previous and next pages.
 *
 * @since 2.8.0
 *
-* @param string|array $args Optional args.
+* @global WP_Query $wp_query
+*
+* @param string|array $args {
+*     Optional. Arguments to build the post pages link navigation.
+*
+*     @type string $sep      Separator character. Default '&#8212;'.
+*     @type string $prelabel Link text to display for the previous page link.
+*                            Default '&laquo; Previous Page'.
+*     @type string $nxtlabel Link text to display for the next page link.
+*                            Default 'Next Page &raquo;'.
+* }
 * @return string The posts link navigation.
 */
 function get_posts_nav_link( $args = array() ) {
 	global $wp_query;
 	return $return;
 }
 /**
-* Display post pages link navigation for previous and next pages.
+* Displays the post pages link navigation for previous and next pages.
 *
 * @since 0.71
 *
-* @param string $sep Optional. Separator for posts navigation links.
+* @param string $sep      Optional. Separator for posts navigation links. Default empty.
-* @param string $prelabel Optional. Label for previous pages.
+* @param string $prelabel Optional. Label for previous pages. Default empty.
-* @param string $nxtlabel Optional Label for next pages.
+* @param string $nxtlabel Optional Label for next pages. Default empty.
 */
 function posts_nav_link( $sep = '', $prelabel = '', $nxtlabel = '' ) {
 	$args = array_filter( compact('sep', 'prelabel', 'nxtlabel') );
 	echo get_posts_nav_link($args);
 }
 /**
-* Return navigation to next/previous post when applicable.
+* Retrieves the navigation to next/previous post, when applicable.
 *
 * @since 4.1.0
+* @since 4.4.0 Introduced the `in_same_term`, `excluded_terms`, and `taxonomy` arguments.
 *
 * @param array $args {
 *     Optional. Default post navigation arguments. Default empty array.
 *
-*     @type string $prev_text          Anchor text to display in the previous post link. Default `%title`.
+*     @type string       $prev_text          Anchor text to display in the previous post link. Default '%title'.
-*     @type string $next_text          Anchor text to display in the next post link. Default `%title`.
+*     @type string       $next_text          Anchor text to display in the next post link. Default '%title'.
-*     @type string $screen_reader_text Screen reader text for nav element. Default 'Post navigation'.
+*     @type bool         $in_same_term       Whether link should be in a same taxonomy term. Default false.
+*     @type array|string $excluded_terms     Array or comma-separated list of excluded term IDs. Default empty.
+*     @type string       $taxonomy           Taxonomy, if `$in_same_term` is true. Default 'category'.
+*     @type string       $screen_reader_text Screen reader text for nav element. Default 'Post navigation'.
 * }
 * @return string Markup for post links.
 */
 function get_the_post_navigation( $args = array() ) {
 	$args = wp_parse_args( $args, array(
 		'prev_text'          => '%title',
 		'next_text'          => '%title',
+		'in_same_term'       => false,
+		'excluded_terms'     => '',
+		'taxonomy'           => 'category',
 		'screen_reader_text' => __( 'Post navigation' ),
 	) );
 	$navigation = '';
-	$previous   = get_previous_post_link( '<div class="nav-previous">%link</div>', $args['prev_text'] );
-	$next       = get_next_post_link( '<div class="nav-next">%link</div>', $args['next_text'] );
+	$previous = get_previous_post_link(
+		'<div class="nav-previous">%link</div>',
+		$args['prev_text'],
+		$args['in_same_term'],
+		$args['excluded_terms'],
+		$args['taxonomy']
+	);
+	$next = get_next_post_link(
+		'<div class="nav-next">%link</div>',
+		$args['next_text'],
+		$args['in_same_term'],
+		$args['excluded_terms'],
+		$args['taxonomy']
+	);
 	// Only add markup if there's somewhere to navigate to.
 	if ( $previous || $next ) {
 		$navigation = _navigation_markup( $previous . $next, 'post-navigation', $args['screen_reader_text'] );
 	}
 	return $navigation;
 }
 /**
-* Display navigation to next/previous post when applicable.
+* Displays the navigation to next/previous post, when applicable.
 *
 * @since 4.1.0
 *
-* @param array $args Optional. See {@see get_the_post_navigation()} for available
+* @param array $args Optional. See get_the_post_navigation() for available arguments.
-*                    arguments. Default empty array.
+*                    Default empty array.
 */
 function the_post_navigation( $args = array() ) {
 	echo get_the_post_navigation( $args );
 }
 /**
-* Return navigation to next/previous set of posts when applicable.
+* Returns the navigation to next/previous set of posts, when applicable.
 *
 * @since 4.1.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 	return $navigation;
 }
 /**
-* Display navigation to next/previous set of posts when applicable.
+* Displays the navigation to next/previous set of posts, when applicable.
 *
 * @since 4.1.0
 *
-* @param array $args Optional. See {@see get_the_posts_navigation()} for available
+* @param array $args Optional. See get_the_posts_navigation() for available arguments.
-*                    arguments. Default empty array.
+*                    Default empty array.
 */
 function the_posts_navigation( $args = array() ) {
 	echo get_the_posts_navigation( $args );
 }
 /**
-* Return a paginated navigation to next/previous set of posts,
+* Retrieves a paginated navigation to next/previous set of posts, when applicable.
-* when applicable.
 *
 * @since 4.1.0
 *
 * @param array $args {
-*     Optional. Default pagination arguments, {@see paginate_links()}.
+*     Optional. Default pagination arguments, see paginate_links().
 *
 *     @type string $screen_reader_text Screen reader text for navigation element.
 *                                      Default 'Posts navigation'.
 * }
 * @return string Markup for pagination links.
 	// Don't print empty markup if there's only one page.
 	if ( $GLOBALS['wp_query']->max_num_pages > 1 ) {
 		$args = wp_parse_args( $args, array(
 			'mid_size'           => 1,
-			'prev_text'          => _x( 'Previous', 'previous post' ),
+			'prev_text'          => _x( 'Previous', 'previous set of posts' ),
-			'next_text'          => _x( 'Next', 'next post' ),
+			'next_text'          => _x( 'Next', 'next set of posts' ),
 			'screen_reader_text' => __( 'Posts navigation' ),
 		) );
 		// Make sure we get a string back. Plain is the next best thing.
 		if ( isset( $args['type'] ) && 'array' == $args['type'] ) {
 	return $navigation;
 }
 /**
-* Display a paginated navigation to next/previous set of posts,
+* Displays a paginated navigation to next/previous set of posts, when applicable.
-* when applicable.
 *
 * @since 4.1.0
 *
-* @param array $args Optional. See {@see get_the_posts_pagination()} for available arguments.
+* @param array $args Optional. See get_the_posts_pagination() for available arguments.
 *                    Default empty array.
 */
 function the_posts_pagination( $args = array() ) {
 	echo get_the_posts_pagination( $args );
 }
 	<nav class="navigation %1$s" role="navigation">
 		<h2 class="screen-reader-text">%2$s</h2>
 		<div class="nav-links">%3$s</div>
 	</nav>';
+	/**
+	 * Filters the navigation markup template.
+	 *
+	 * Note: The filtered template HTML must contain specifiers for the navigation
+	 * class (%1$s), the screen-reader-text value (%2$s), and placement of the
+	 * navigation links (%3$s):
+	 *
+	 *     <nav class="navigation %1$s" role="navigation">
+	 *         <h2 class="screen-reader-text">%2$s</h2>
+	 *         <div class="nav-links">%3$s</div>
+	 *     </nav>
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string $template The default template.
+	 * @param string $class    The class passed by the calling function.
+	 * @return string Navigation template.
+	 */
+	$template = apply_filters( 'navigation_markup_template', $template, $class );
 	return sprintf( $template, sanitize_html_class( $class ), esc_html( $screen_reader_text ), $links );
 }
 /**
-* Retrieve comments page number link.
+* Retrieves the comments page number link.
 *
 * @since 2.7.0
 *
-* @param int $pagenum Optional. Page number.
+* @global WP_Rewrite $wp_rewrite
-* @param int $max_page Optional. The maximum number of comment pages.
+*
+* @param int $pagenum  Optional. Page number. Default 1.
+* @param int $max_page Optional. The maximum number of comment pages. Default 0.
 * @return string The comments page number link URL.
 */
 function get_comments_pagenum_link( $pagenum = 1, $max_page = 0 ) {
 	global $wp_rewrite;
 	}
 	$result .= '#comments';
 	/**
-	 * Filter the comments page number link for the current request.
+	 * Filters 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 apply_filters( 'get_comments_pagenum_link', $result );
+}
-	return $result;
-}
+/**
+* Retrieves the link to the next comments page.
-/**
-* Return the link to next comments page.
 *
 * @since 2.7.1
 *
-* @param string $label Optional. Label for link text.
+* @global WP_Query $wp_query
-* @param int $max_page Optional. Max page.
+*
-* @return string|null HTML-formatted link for the next page of comments.
+* @param string $label    Optional. Label for link text. Default empty.
+* @param int    $max_page Optional. Max page. Default 0.
+* @return string|void HTML-formatted link for the next page of comments.
 */
 function get_next_comments_link( $label = '', $max_page = 0 ) {
 	global $wp_query;
-	if ( !is_singular() || !get_option('page_comments') )
+	if ( ! is_singular() )
 		return;
 	$page = get_query_var('cpage');
 	if ( ! $page ) {
 	if ( empty($label) )
 		$label = __('Newer Comments &raquo;');
 	/**
-	 * Filter the anchor tag attributes for the next comments page link.
+	 * Filters 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.
+* Displays the link to the next comments page.
 *
 * @since 2.7.0
 *
-* @param string $label Optional. Label for link text.
+* @param string $label    Optional. Label for link text. Default empty.
-* @param int $max_page Optional. Max page.
+* @param int    $max_page Optional. Max page. Default 0.
 */
 function next_comments_link( $label = '', $max_page = 0 ) {
 	echo get_next_comments_link( $label, $max_page );
 }
 /**
-* Return the previous comments page link.
+* Retrieves the link to the previous comments page.
 *
 * @since 2.7.1
 *
-* @param string $label Optional. Label for comments link text.
+* @param string $label Optional. Label for comments link text. Default empty.
-* @return string|null HTML-formatted link for the previous page of comments.
+* @return string|void HTML-formatted link for the previous page of comments.
 */
 function get_previous_comments_link( $label = '' ) {
-	if ( !is_singular() || !get_option('page_comments') )
+	if ( ! is_singular() )
 		return;
 	$page = get_query_var('cpage');
 	if ( intval($page) <= 1 )
 	if ( empty($label) )
 		$label = __('&laquo; Older Comments');
 	/**
-	 * Filter the anchor tag attributes for the previous comments page link.
+	 * Filters 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.
+* Displays the link to the previous comments page.
 *
 * @since 2.7.0
 *
-* @param string $label Optional. Label for comments link text.
+* @param string $label Optional. Label for comments link text. Default empty.
 */
 function previous_comments_link( $label = '' ) {
 	echo get_previous_comments_link( $label );
 }
 /**
-* Create pagination links for the comments on the current post.
+* Displays or retrieves 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().
+* @global WP_Rewrite $wp_rewrite
-* @return string Markup for pagination links.
+*
-*/
+* @param string|array $args Optional args. See paginate_links(). Default empty array.
-function paginate_comments_links($args = array()) {
+* @return string|void Markup for pagination links.
+*/
+function paginate_comments_links( $args = array() ) {
 	global $wp_rewrite;
-	if ( !is_singular() || !get_option('page_comments') )
+	if ( ! is_singular() )
 		return;
 	$page = get_query_var('cpage');
 	if ( !$page )
 		$page = 1;
 	else
 		return $page_links;
 }
 /**
-* Retrieve the Press This bookmarklet link.
+* Retrieves navigation to next/previous set of comments, when applicable.
 *
-* Use this in 'a' element 'href' attribute.
+* @since 4.4.0
 *
-* @since 2.6.0
+* @param array $args {
-*
+*     Optional. Default comments navigation arguments.
-* @return string The Press This bookmarklet link URL.
+*
-*/
+*     @type string $prev_text          Anchor text to display in the previous comments link.
-function get_shortcut_link() {
+*                                      Default 'Older comments'.
-	global $is_IE, $wp_version;
+*     @type string $next_text          Anchor text to display in the next comments link.
+*                                      Default 'Newer comments'.
-	include_once( ABSPATH . 'wp-admin/includes/class-wp-press-this.php' );
+*     @type string $screen_reader_text Screen reader text for nav element. Default 'Comments navigation'.
-	$bookmarklet_version = $GLOBALS['wp_press_this']->version;
+* }
-	$link = '';
+* @return string Markup for comments links.
+*/
-	if ( $is_IE ) {
+function get_the_comments_navigation( $args = array() ) {
-		/**
+	$navigation = '';
-		 * Return the old/shorter bookmarklet code for MSIE 8 and lower,
-		 * since they only support a max length of ~2000 characters for
+	// Are there comments to navigate through?
-		 * bookmark[let] URLs, which is way to small for our smarter one.
+	if ( get_comment_pages_count() > 1 ) {
-		 * Do update the version number so users do not get the "upgrade your
+		$args = wp_parse_args( $args, array(
-		 * bookmarklet" notice when using PT in those browsers.
+			'prev_text'          => __( 'Older comments' ),
-		 */
+			'next_text'          => __( 'Newer comments' ),
-		$ua = $_SERVER['HTTP_USER_AGENT'];
+			'screen_reader_text' => __( 'Comments navigation' ),
+		) );
-		if ( ! empty( $ua ) && preg_match( '/\bMSIE (\d)/', $ua, $matches ) && (int) $matches[1] <= 8 ) {
-			$url = wp_json_encode( admin_url( 'press-this.php' ) );
+		$prev_link = get_previous_comments_link( $args['prev_text'] );
+		$next_link = get_next_comments_link( $args['next_text'] );
-			$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=' . $url . ',l=d.location,e=encodeURIComponent,' .
+		if ( $prev_link ) {
-				'u=f+"?u="+e(l.href)+"&t="+e(d.title)+"&s="+e(s)+"&v=' . $bookmarklet_version . '";' .
+			$navigation .= '<div class="nav-previous">' . $prev_link . '</div>';
-				'a=function(){if(!w.open(u,"t","toolbar=0,resizable=1,scrollbars=1,status=1,width=600,height=700"))l.href=u;};' .
-				'if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else a();void(0)';
 		}
-	}
+		if ( $next_link ) {
-	if ( empty( $link ) ) {
+			$navigation .= '<div class="nav-next">' . $next_link . '</div>';
-		$src = @file_get_contents( ABSPATH . 'wp-admin/js/bookmarklet.min.js' );
-		if ( $src ) {
-			$url = wp_json_encode( admin_url( 'press-this.php' ) . '?v=' . $bookmarklet_version );
-			$link = 'javascript:' . str_replace( 'window.pt_url', $url, $src );
 		}
-	}
+		$navigation = _navigation_markup( $navigation, 'comment-navigation', $args['screen_reader_text'] );
-	$link = str_replace( array( "\r", "\n", "\t" ),  '', $link );
+	}
-	/**
+	return $navigation;
-	 * Filter the Press This bookmarklet link.
+}
-	 *
-	 * @since 2.6.0
+/**
-	 *
+* Displays navigation to next/previous set of comments, when applicable.
-	 * @param string $link The Press This bookmarklet link.
+*
-	 */
+* @since 4.4.0
-	return apply_filters( 'shortcut_link', $link );
+*
-}
+* @param array $args See get_the_comments_navigation() for available arguments. Default empty array.
+*/
-/**
+function the_comments_navigation( $args = array() ) {
-* Retrieve the home url for the current site.
+	echo get_the_comments_navigation( $args );
-*
+}
-* Returns the 'home' option with the appropriate protocol, 'https' if
-* {@see is_ssl()} and 'http' otherwise. If `$scheme` is 'http' or 'https',
+/**
-* `is_ssl()` is overridden.
+* Retrieves a paginated navigation to next/previous set of comments, when applicable.
+*
+* @since 4.4.0
+*
+* @see paginate_comments_links()
+*
+* @param array $args {
+*     Optional. Default pagination arguments.
+*
+*     @type string $screen_reader_text Screen reader text for nav element. Default 'Comments navigation'.
+* }
+* @return string Markup for pagination links.
+*/
+function get_the_comments_pagination( $args = array() ) {
+	$navigation = '';
+	$args       = wp_parse_args( $args, array(
+		'screen_reader_text' => __( 'Comments navigation' ),
+	) );
+	$args['echo'] = false;
+	// Make sure we get a string back. Plain is the next best thing.
+	if ( isset( $args['type'] ) && 'array' == $args['type'] ) {
+		$args['type'] = 'plain';
+	}
+	$links = paginate_comments_links( $args );
+	if ( $links ) {
+		$navigation = _navigation_markup( $links, 'comments-pagination', $args['screen_reader_text'] );
+	}
+	return $navigation;
+}
+/**
+* Displays a paginated navigation to next/previous set of comments, when applicable.
+*
+* @since 4.4.0
+*
+* @param array $args See get_the_comments_pagination() for available arguments. Default empty array.
+*/
+function the_comments_pagination( $args = array() ) {
+	echo get_the_comments_pagination( $args );
+}
+/**
+* Retrieves the URL for the current site where the front end is accessible.
+*
+* Returns the 'home' option with the appropriate protocol. The protocol will be 'https'
+* if is_ssl() evaluates to true; otherwise, it will be the same as the 'home' option.
+* If `$scheme` is 'http' or 'https', is_ssl() is overridden.
 *
 * @since 3.0.0
 *
-* @param  string $path   Optional. Path relative to the home url. Default empty.
+* @param  string      $path   Optional. Path relative to the home URL. Default empty.
-* @param  string $scheme Optional. Scheme to give the home url context. Accepts
+* @param  string|null $scheme Optional. Scheme to give the home URL context. Accepts
-*                        'http', 'https', or 'relative'. Default null.
+*                             'http', 'https', 'relative', 'rest', or null. Default null.
-* @return string Home url link with optional path appended.
+* @return string Home URL link with optional path appended.
 */
 function home_url( $path = '', $scheme = null ) {
 	return get_home_url( null, $path, $scheme );
 }
 /**
-* Retrieve the home url for a given site.
+* Retrieves the URL for a given site where the front end is accessible.
 *
-* Returns the 'home' option with the appropriate protocol, 'https' if
+* Returns the 'home' option with the appropriate protocol. The protocol will be 'https'
-* {@see is_ssl()} and 'http' otherwise. If `$scheme` is 'http' or 'https',
+* if is_ssl() evaluates to true; otherwise, it will be the same as the 'home' option.
-* `is_ssl()` is
+* If `$scheme` is 'http' or 'https', is_ssl() is overridden.
-* overridden.
 *
 * @since 3.0.0
 *
-* @param  int         $blog_id     Optional. Blog ID. Default null (current blog).
+* @global string $pagenow
-* @param  string      $path        Optional. Path relative to the home URL. Default empty.
+*
-* @param  string|null $orig_scheme Optional. Scheme to give the home URL context. Accepts
+* @param  int         $blog_id Optional. Site ID. Default null (current site).
-*                                  'http', 'https', 'relative', or null. Default null.
+* @param  string      $path    Optional. Path relative to the home URL. Default empty.
+* @param  string|null $scheme  Optional. Scheme to give the home URL context. Accepts
+*                              'http', 'https', 'relative', 'rest', or null. Default null.
 * @return string Home URL link with optional path appended.
 */
 function get_home_url( $blog_id = null, $path = '', $scheme = null ) {
+	global $pagenow;
 	$orig_scheme = $scheme;
 	if ( empty( $blog_id ) || !is_multisite() ) {
 		$url = get_option( 'home' );
 	} else {
 		$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'] )
+		if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $pagenow )
 			$scheme = 'https';
 		else
 			$scheme = parse_url( $url, PHP_URL_SCHEME );
 	}
 	if ( $path && is_string( $path ) )
 		$url .= '/' . ltrim( $path, '/' );
 	/**
-	 * Filter the home URL.
+	 * Filters 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 string|null $orig_scheme Scheme to give the home URL context. Accepts 'http', 'https',
-	 * @param int|null    $blog_id     Blog ID, or null for the current blog.
+	 *                                 'relative', 'rest', or null.
+	 * @param int|null    $blog_id     Site ID, or null for the current site.
 	 */
 	return apply_filters( 'home_url', $url, $path, $orig_scheme, $blog_id );
 }
 /**
-* Retrieve the site url for the current site.
+* Retrieves the URL for the current site where WordPress application files
+* (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.
 *
 * 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 string $path Optional. Path relative to the site url.
+* @param string $path   Optional. Path relative to the site URL. Default empty.
-* @param string $scheme Optional. Scheme to give the site url context. See set_url_scheme().
+* @param string $scheme Optional. Scheme to give the site URL context. See set_url_scheme().
-* @return string Site url link with optional path appended.
+* @return string Site URL link with optional path appended.
 */
 function site_url( $path = '', $scheme = null ) {
 	return get_site_url( null, $path, $scheme );
 }
 /**
-* Retrieve the site url for a given site.
+* Retrieves the URL for a given site where WordPress application files
+* (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.
 *
 * Returns the 'site_url' option with the appropriate protocol, 'https' if
-* {@see is_ssl()} and 'http' otherwise. If `$scheme` is 'http' or 'https',
+* 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. Default null (current site).
+* @param int    $blog_id Optional. Site ID. Default null (current site).
-* @param string $path    Optional. Path relative to the site url. Default empty.
+* @param string $path    Optional. Path relative to the site URL. Default empty.
-* @param string $scheme  Optional. Scheme to give the site url context. Accepts
+* @param string $scheme  Optional. Scheme to give the site URL context. Accepts
 *                        'http', 'https', 'login', 'login_post', 'admin', or
 *                        'relative'. Default null.
-* @return string Site url link with optional path appended.
+* @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 );
 	if ( $path && is_string( $path ) )
 		$url .= '/' . ltrim( $path, '/' );
 	/**
-	 * Filter the site URL.
+	 * Filters 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.
+	 * @param int|null    $blog_id Site ID, or null for the current site.
 	 */
 	return apply_filters( 'site_url', $url, $path, $scheme, $blog_id );
 }
 /**
-* Retrieve the url to the admin area for the current site.
+* Retrieves 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 $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.
+* @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl().
-* @return string Admin url link with optional path appended.
+*                       '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 );
 }
 /**
-* Retrieves the url to the admin area for a given site.
+* Retrieves the URL to the admin area for a given site.
 *
 * @since 3.0.0
 *
-* @param int    $blog_id Optional. Blog ID. Default null (current site).
+* @param int    $blog_id Optional. Site ID. Default null (current site).
-* @param string $path    Optional. Path relative to the admin url. Default empty.
+* @param string $path    Optional. Path relative to the admin URL. Default empty.
 * @param string $scheme  Optional. The scheme to use. Accepts 'http' or 'https',
 *                        to force those schemes. Default 'admin', which obeys
-*                        {@see force_ssl_admin()} and {@see is_ssl()}.
+*                        force_ssl_admin() and is_ssl().
-* @return string Admin url link with optional path appended.
+* @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.
+	 * Filters 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.
+	 * @param int|null $blog_id Site ID, or null for the current site.
 	 */
 	return apply_filters( 'admin_url', $url, $path, $blog_id );
 }
 /**
-* Retrieve the url to the includes directory.
+* Retrieves the URL to the includes directory.
 *
 * @since 2.6.0
 *
-* @param string $path Optional. Path relative to the includes url.
+* @param string $path   Optional. Path relative to the includes URL. Default empty.
-* @param string $scheme Optional. Scheme to give the includes url context.
+* @param string $scheme Optional. Scheme to give the includes URL context. Accepts
-* @return string Includes url link with optional path appended.
+*                       'http', 'https', or 'relative'. Default null.
-*/
+* @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.
+	 * Filters 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
 	 */
 	return apply_filters( 'includes_url', $url, $path );
 }
 /**
-* Retrieve the url to the content directory.
+* Retrieves the URL to the content directory.
 *
 * @since 2.6.0
 *
-* @param string $path Optional. Path relative to the content url.
+* @param string $path Optional. Path relative to the content URL. Default empty.
-* @return string Content url link with optional path appended.
+* @return string Content URL link with optional path appended.
 */
-function content_url($path = '') {
+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.
+	 * Filters 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
 	 */
 	return apply_filters( 'content_url', $url, $path);
 }
 /**
-* Retrieve a URL within the plugins or mu-plugins directory.
+* Retrieves a URL within the plugins or mu-plugins directory.
 *
 * Defaults to the plugins directory URL if no arguments are supplied.
 *
 * @since 2.6.0
 *
 *                        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 ( $path && is_string( $path ) )
 		$url .= '/' . ltrim($path, '/');
 	/**
-	 * Filter the URL to the plugins directory.
+	 * Filters 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
 	 */
 	return apply_filters( 'plugins_url', $url, $path, $plugin );
 }
 /**
-* Retrieve the site url for the current network.
+* Retrieves the site URL for the current network.
 *
-* Returns the site url with the appropriate protocol, 'https' if
+* 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.
+* @see set_url_scheme()
-* @param string $scheme Optional. Scheme to give the site url context. See set_url_scheme().
+*
-* @return string Site url link with optional path appended.
+* @param string $path   Optional. Path relative to the site URL. Default empty.
-*/
+* @param string $scheme Optional. Scheme to give the site URL context. Accepts
+*                       'http', 'https', or 'relative'. Default null.
+* @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();
+	$current_network = get_network();
 	if ( 'relative' == $scheme )
-		$url = $current_site->path;
+		$url = $current_network->path;
 	else
-		$url = set_url_scheme( 'http://' . $current_site->domain . $current_site->path, $scheme );
+		$url = set_url_scheme( 'http://' . $current_network->domain . $current_network->path, $scheme );
 	if ( $path && is_string( $path ) )
 		$url .= ltrim( $path, '/' );
 	/**
-	 * Filter the network site URL.
+	 * Filters 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
 	 */
 	return apply_filters( 'network_site_url', $url, $path, $scheme );
 }
 /**
-* Retrieves the home url for the current network.
+* Retrieves the home URL for the current network.
 *
-* Returns the home url with the appropriate protocol, 'https' {@see is_ssl()}
+* Returns the home URL with the appropriate protocol, 'https' is_ssl()
 * and 'http' otherwise. If `$scheme` is 'http' or 'https', `is_ssl()` is
 * overridden.
 *
 * @since 3.0.0
 *
-* @param  string $path   Optional. Path relative to the home url. Default empty.
+* @param  string $path   Optional. Path relative to the home URL. Default empty.
-* @param  string $scheme Optional. Scheme to give the home url context. Accepts
+* @param  string $scheme Optional. Scheme to give the home URL context. Accepts
 *                        'http', 'https', or 'relative'. Default null.
-* @return string Home url link with optional path appended.
+* @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();
+	$current_network = get_network();
 	$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;
+		$url = $current_network->path;
 	else
-		$url = set_url_scheme( 'http://' . $current_site->domain . $current_site->path, $scheme );
+		$url = set_url_scheme( 'http://' . $current_network->domain . $current_network->path, $scheme );
 	if ( $path && is_string( $path ) )
 		$url .= ltrim( $path, '/' );
 	/**
-	 * Filter the network home URL.
+	 * Filters 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
 	 */
 	return apply_filters( 'network_home_url', $url, $path, $orig_scheme);
 }
 /**
-* Retrieve the url to the admin area for the network.
+* Retrieves 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 $path   Optional path relative to the admin URL. Default empty.
-* @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.
+* @param string $scheme Optional. The scheme to use. Default is 'admin', which obeys force_ssl_admin()
-* @return string Admin url link with optional path appended.
+*                       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.
+	 * Filters 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
 	 */
 	return apply_filters( 'network_admin_url', $url, $path );
 }
 /**
-* Retrieve the url to the admin area for the current user.
+* Retrieves 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 $path   Optional. Path relative to the admin URL. Default empty.
-* @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.
+* @param string $scheme Optional. The scheme to use. Default is 'admin', which obeys force_ssl_admin()
-* @return string Admin url link with optional path appended.
+*                       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.
+	 * Filters 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
 	 */
 	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.
+* Retrieves the URL to the admin area for either the current site or the network depending on context.
 *
 * @since 3.1.0
 *
-* @param string $path Optional path relative to the admin url.
+* @param string $path   Optional. Path relative to the admin URL. Default empty.
-* @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.
+* @param string $scheme Optional. The scheme to use. Default is 'admin', which obeys force_ssl_admin()
-* @return string Admin url link with optional path appended.
+*                       and is_ssl(). 'http' or 'https' can be passed to force those schemes.
-*/
+* @return string Admin URL link with optional path appended.
-function self_admin_url($path = '', $scheme = 'admin') {
+*/
-	if ( is_network_admin() )
+function self_admin_url( $path = '', $scheme = 'admin' ) {
-		return network_admin_url($path, $scheme);
+	if ( is_network_admin() ) {
-	elseif ( is_user_admin() )
+		$url = network_admin_url( $path, $scheme );
-		return user_admin_url($path, $scheme);
+	} elseif ( is_user_admin() ) {
-	else
+		$url = user_admin_url( $path, $scheme );
-		return admin_url($path, $scheme);
+	} else {
-}
+		$url = admin_url( $path, $scheme );
+	}
-/**
-* Set the scheme for a URL
+	/**
+	 * Filters the admin URL for the current site or network depending on context.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @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.
+	 * @param string $scheme The scheme to use.
+	 */
+	return apply_filters( 'self_admin_url', $url, $path, $scheme );
+}
+/**
+* Sets the scheme for a URL.
 *
 * @since 3.4.0
-*
+* @since 4.4.0 The 'rest' scheme was added.
-* @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'.
+* @param string      $url    Absolute URL that includes a scheme
+* @param string|null $scheme Optional. Scheme to give $url. Currently 'http', 'https', 'login',
+*                            'login_post', 'admin', 'relative', 'rest', 'rpc', or null. Default null.
 * @return string $url URL with chosen scheme.
 */
 function set_url_scheme( $url, $scheme = null ) {
 	$orig_scheme = $scheme;
 	} else {
 		$url = preg_replace( '#^\w+://#', $scheme . '://', $url );
 	}
 	/**
-	 * Filter the resulting URL after setting the scheme.
+	 * Filters the resulting URL after setting the scheme.
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string $url         The complete URL including scheme and path.
+	 * @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      $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',
+	 * @param string|null $orig_scheme Scheme requested for the URL. One of 'http', 'https', 'login',
-	 *                            'login_post', 'admin', 'rpc', or 'relative'.
+	 *                                 'login_post', 'admin', 'relative', 'rest', 'rpc', or null.
 	 */
 	return apply_filters( 'set_url_scheme', $url, $scheme, $orig_scheme );
 }
 /**
-* Get the URL to the user's dashboard.
+* Retrieves 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,
+* If a user does not belong to any site, the global user dashboard is used. If the user
-* the dashboard for the current site is returned. If the user cannot edit the current site, the dashboard to the user's
+* belongs to the current site, the dashboard for the current site is returned. If the user
-* primary blog is returned.
+* cannot edit the current site, the dashboard to the user's primary site is returned.
 *
 * @since 3.1.0
 *
-* @param int $user_id Optional. User ID. Defaults to current user.
+* @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 $path    Optional path relative to the dashboard. Use only paths known to
-* @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.
+*                        both site and user admins. Default empty.
-* @return string Dashboard url link with optional path appended.
+* @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) ) {
+	if ( is_multisite() && ! user_can( $user_id, 'manage_network' ) && empty($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 ) ) ) ) {
+		if ( $current_blog  && ( user_can( $user_id, 'manage_network' ) || 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 );
 				$url = user_admin_url( $path, $scheme );
 		}
 	}
 	/**
-	 * Filter the dashboard URL for a user.
+	 * Filters 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.
 	 */
 	return apply_filters( 'user_dashboard_url', $url, $user_id, $path, $scheme);
 }
 /**
-* Get the URL to the user's profile editor.
+* Retrieves 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().
+* @param string $scheme  Optional. The scheme to use. Default is 'admin', which obeys force_ssl_admin()
-*                        'http' or 'https' can be passed to force those schemes.
+*                        and is_ssl(). 'http' or 'https' can be passed to force those schemes.
-* @return string Dashboard url link with optional path appended.
+* @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 = 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.
+	 * Filters 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.
 	 */
 	return apply_filters( 'edit_profile_url', $url, $user_id, $scheme);
 }
 /**
-* Output rel=canonical for singular queries.
+* Returns the canonical URL for a post.
+*
+* When the post is the same as the current requested page the function will handle the
+* pagination arguments too.
+*
+* @since 4.6.0
+*
+* @param int|WP_Post $post Optional. Post ID or object. Default is global `$post`.
+* @return string|false The canonical URL, or false if the post does not exist or has not
+*                      been published yet.
+*/
+function wp_get_canonical_url( $post = null ) {
+	$post = get_post( $post );
+	if ( ! $post ) {
+		return false;
+	}
+	if ( 'publish' !== $post->post_status ) {
+		return false;
+	}
+	$canonical_url = get_permalink( $post );
+	// If a canonical is being generated for the current page, make sure it has pagination if needed.
+	if ( $post->ID === get_queried_object_id() ) {
+		$page = get_query_var( 'page', 0 );
+		if ( $page >= 2 ) {
+			if ( '' == get_option( 'permalink_structure' ) ) {
+				$canonical_url = add_query_arg( 'page', $page, $canonical_url );
+			} else {
+				$canonical_url = trailingslashit( $canonical_url ) . user_trailingslashit( $page, 'single_paged' );
+			}
+		}
+		$cpage = get_query_var( 'cpage', 0 );
+		if ( $cpage ) {
+			$canonical_url = get_comments_pagenum_link( $cpage );
+		}
+	}
+	/**
+	 * Filters the canonical URL for a post.
+	 *
+	 * @since 4.6.0
+	 *
+	 * @param string  $canonical_url The post's canonical URL.
+	 * @param WP_Post $post          Post object.
+	 */
+	return apply_filters( 'get_canonical_url', $canonical_url, $post );
+}
+/**
+* Outputs rel=canonical for singular queries.
 *
 * @since 2.9.0
-*/
+* @since 4.6.0 Adjusted to use wp_get_canonical_url().
+*/
 function rel_canonical() {
-	if ( !is_singular() )
+	if ( ! is_singular() ) {
 		return;
+	}
-	global $wp_the_query;
-	if ( !$id = $wp_the_query->get_queried_object_id() )
+	$id = get_queried_object_id();
+	if ( 0 === $id ) {
 		return;
+	}
-	$link = get_permalink( $id );
+	$url = wp_get_canonical_url( $id );
-	if ( $page = get_query_var('cpage') )
-		$link = get_comments_pagenum_link( $page );
+	if ( ! empty( $url ) ) {
+		echo '<link rel="canonical" href="' . esc_url( $url ) . '" />' . "\n";
-	echo "<link rel='canonical' href='$link' />\n";
+	}
 }
 /**
-* Return a shortlink for a post, page, attachment, or blog.
+* Returns a shortlink for a post, page, attachment, or site.
 *
-* This function exists to provide a shortlink tag that all themes and plugins can target. A plugin must hook in to
+* This function exists to provide a shortlink tag that all themes and plugins can target.
-* provide the actual shortlinks. Default shortlink support is limited to providing ?p= style links for posts.
+* A plugin must hook in to provide the actual shortlinks. Default shortlink support is
-* Plugins can short-circuit this function via the pre_get_shortlink filter or filter the output
+* limited to providing ?p= style links for posts. Plugins can short-circuit this function
-* via the get_shortlink filter.
+* via the {@see 'pre_get_shortlink'} filter or filter the output via the {@see '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 int    $id          Optional. A post or site id. Default is 0, which means the current post or site.
-* @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 string $context     Optional. Whether the id is a 'site' id, 'post' id, or 'media' id. If '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.
+*                            the post_type of the post is consulted. If 'query', the current query is consulted
-* @return string A shortlink or an empty string if no shortlink exists for the requested resource or if shortlinks are not enabled.
+*                            to determine the id and context. Default 'post'.
-*/
+* @param bool   $allow_slugs Optional. Whether to allow post slugs in the shortlink. It is up to the plugin how
-function wp_get_shortlink($id = 0, $context = 'post', $allow_slugs = true) {
+*                            and whether to honor this. Default true.
-	/**
+* @return string A shortlink or an empty string if no shortlink exists for the requested resource or if shortlinks
-	 * Filter whether to preempt generating a shortlink for the given post.
+*                are not enabled.
+*/
+function wp_get_shortlink( $id = 0, $context = 'post', $allow_slugs = true ) {
+	/**
+	 * Filters 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 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 )
+	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_id = 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 = home_url( '?p=' . $post_id );
 		}
 	}
 	/**
-	 * Filter the shortlink for a post.
+	 * Filters 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.
 	 */
 	return apply_filters( 'get_shortlink', $shortlink, $id, $context, $allow_slugs );
 }
 /**
-*  Inject rel=shortlink into head if a shortlink is defined for the current page.
+* Injects rel=shortlink into the head if a shortlink is defined for the current page.
 *
-*  Attached to the wp_head action.
+* Attached to the {@see 'wp_head'} action.
 *
 * @since 3.0.0
 */
 function wp_shortlink_wp_head() {
 	$shortlink = wp_get_shortlink( 0, 'query' );
 	echo "<link rel='shortlink' href='" . esc_url( $shortlink ) . "' />\n";
 }
 /**
-* Send a Link: rel=shortlink header if a shortlink is defined for the current page.
+* Sends a Link: rel=shortlink header if a shortlink is defined for the current page.
 *
-* Attached to the wp action.
+* Attached to the {@see 'wp'} action.
 *
 * @since 3.0.0
 */
 function wp_shortlink_header() {
 	if ( headers_sent() )
 	header('Link: <' . $shortlink . '>; rel=shortlink', false);
 }
 /**
-* Display the Short Link for a Post
+* Displays the shortlink for a post.
 *
 * Must be called from inside "The Loop"
 *
-* Call like the_shortlink(__('Shortlinkage FTW'))
+* 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 $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 $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 $before Optional HTML to display before the link. Default empty.
-* @param string $after Optional HTML to display after the link.
+* @param string $after  Optional HTML to display after the link. Default empty.
 */
 function the_shortlink( $text = '', $title = '', $before = '', $after = '' ) {
 	$post = get_post();
 	if ( empty( $text ) )
 	if ( !empty( $shortlink ) ) {
 		$link = '<a rel="shortlink" href="' . esc_url( $shortlink ) . '" title="' . $title . '">' . $text . '</a>';
 		/**
-		 * Filter the shortlink anchor tag for a post.
+		 * Filters the short link anchor tag for a post.
 		 *
 		 * @since 3.0.0
 		 *
 		 * @param string $link      Shortlink anchor tag.
 		 * @param string $shortlink Shortlink URL.
 	}
 }
 /**
-* Retrieve the avatar URL.
+* Retrieves the avatar URL.
 *
 * @since 4.2.0
 *
 * @param mixed $id_or_email The Gravatar to retrieve a URL for. Accepts a user_id, gravatar md5 hash,
-*                           user email, WP_User object, WP_Post object, or comment object.
+*                           user email, WP_User object, WP_Post object, or WP_Comment object.
 * @param array $args {
 *     Optional. Arguments to return instead of the default arguments.
 *
 *     @type int    $size           Height and width of the avatar in pixels. Default 96.
 *     @type string $default        URL for the default image or a default type. Accepts '404' (return
 *                                  a 404 instead of a default image), 'retro' (8bit), 'monsterid' (monster),
 *                                  'wavatar' (cartoon face), 'indenticon' (the "quilt"), 'mystery', 'mm',
-*                                  or 'mysterman' (The Oyster Man), 'blank' (transparent GIF), or
+*                                  or 'mysteryman' (The Oyster Man), 'blank' (transparent GIF), or
 *                                  'gravatar_default' (the Gravatar logo). Default is the value of the
 *                                  'avatar_default' option, with a fallback of 'mystery'.
 *     @type bool   $force_default  Whether to always show the default image, never the Gravatar. Default false.
 *     @type string $rating         What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are
 *                                  judged in that order. Default is the value of the 'avatar_rating' option.
 	$args = get_avatar_data( $id_or_email, $args );
 	return $args['url'];
 }
 /**
-* Retrieve default data about the avatar.
+* Retrieves default data about the avatar.
 *
 * @since 4.2.0
 *
-* @param mixed $id_or_email The Gravatar to check the data against. Accepts a user_id, gravatar md5 hash,
+* @param mixed $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
-*                           user email, WP_User object, WP_Post object, or comment object.
+*                            user email, WP_User object, WP_Post object, or WP_Comment object.
 * @param array $args {
 *     Optional. Arguments to return instead of the default arguments.
 *
 *     @type int    $size           Height and width of the avatar image file in pixels. Default 96.
 *     @type int    $height         Display height of the avatar in pixels. Defaults to $size.
 *     @type int    $width          Display width of the avatar in pixels. Defaults to $size.
 *     @type string $default        URL for the default image or a default type. Accepts '404' (return
 *                                  a 404 instead of a default image), 'retro' (8bit), 'monsterid' (monster),
 *                                  'wavatar' (cartoon face), 'indenticon' (the "quilt"), 'mystery', 'mm',
-*                                  or 'mysterman' (The Oyster Man), 'blank' (transparent GIF), or
+*                                  or 'mysteryman' (The Oyster Man), 'blank' (transparent GIF), or
 *                                  'gravatar_default' (the Gravatar logo). Default is the value of the
 *                                  'avatar_default' option, with a fallback of 'mystery'.
 *     @type bool   $force_default  Whether to always show the default image, never the Gravatar. Default false.
 *     @type string $rating         What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are
 *                                  judged in that order. Default is the value of the 'avatar_rating' option.
 	$args['rating'] = strtolower( $args['rating'] );
 	$args['found_avatar'] = false;
 	/**
-	 * Filter whether to retrieve the avatar URL early.
+	 * Filters whether to retrieve the avatar URL early.
 	 *
 	 * Passing a non-null value in the 'url' member of the return array will
 	 * effectively short circuit get_avatar_data(), passing the value through
 	 * the {@see 'get_avatar_data'} filter and returning early.
 	 *
 	 * @since 4.2.0
 	 *
-	 * @param array             $args          Arguments passed to get_avatar_data(), after processing.
+	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
-	 * @param int|object|string $id_or_email   A user ID, email address, or comment object.
+	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
+	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
 	 */
 	$args = apply_filters( 'pre_get_avatar_data', $args, $id_or_email );
 	if ( isset( $args['url'] ) && ! is_null( $args['url'] ) ) {
 		/** This filter is documented in wp-includes/link-template.php */
 		return apply_filters( 'get_avatar_data', $args, $id_or_email );
 	}
 	$email_hash = '';
 	$user = $email = false;
+	if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
+		$id_or_email = get_comment( $id_or_email );
+	}
 	// Process the user identifier.
 	if ( is_numeric( $id_or_email ) ) {
 		$user = get_user_by( 'id', absint( $id_or_email ) );
 	} elseif ( is_string( $id_or_email ) ) {
 		// User Object
 		$user = $id_or_email;
 	} elseif ( $id_or_email instanceof WP_Post ) {
 		// Post Object
 		$user = get_user_by( 'id', (int) $id_or_email->post_author );
-	} elseif ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
+	} elseif ( $id_or_email instanceof WP_Comment ) {
-		// Comment Object
 		/**
-		 * Filter the list of allowed comment types for retrieving avatars.
+		 * Filters the list of allowed comment types for retrieving avatars.
 		 *
 		 * @since 3.0.0
 		 *
 		 * @param array $types An array of content types. Default only contains 'comment'.
 		 */
 		'd' => $args['default'],
 		'f' => $args['force_default'] ? 'y' : false,
 		'r' => $args['rating'],
 	);
-	$url = sprintf( 'http://%d.gravatar.com/avatar/%s', $gravatar_server, $email_hash );
+	if ( is_ssl() ) {
+		$url = 'https://secure.gravatar.com/avatar/' . $email_hash;
+	} else {
+		$url = sprintf( 'http://%d.gravatar.com/avatar/%s', $gravatar_server, $email_hash );
+	}
 	$url = add_query_arg(
 		rawurlencode_deep( array_filter( $url_args ) ),
 		set_url_scheme( $url, $args['scheme'] )
 	);
 	/**
-	 * Filter the avatar URL.
+	 * Filters the avatar URL.
 	 *
 	 * @since 4.2.0
 	 *
-	 * @param string            $url         The URL of the avatar.
+	 * @param string $url         The URL of the avatar.
-	 * @param int|object|string $id_or_email A user ID, email address, or comment object.
+	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
-	 * @param array             $args        Arguments passed to get_avatar_data(), after processing.
+	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
+	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
 	 */
 	$args['url'] = apply_filters( 'get_avatar_url', $url, $id_or_email, $args );
 	/**
-	 * Filter the avatar data.
+	 * Filters the avatar data.
 	 *
 	 * @since 4.2.0
 	 *
-	 * @param array             $args        Arguments passed to get_avatar_data(), after processing.
+	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
-	 * @param int|object|string $id_or_email A user ID, email address, or comment object.
+	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
+	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
 	 */
 	return apply_filters( 'get_avatar_data', $args, $id_or_email );
 }
+/**
+* Retrieves the URL of a file in the theme.
+*
+* Searches in the stylesheet directory before the template directory so themes
+* which inherit from a parent theme can just override one file.
+*
+* @since 4.7.0
+*
+* @param string $file Optional. File to search for in the stylesheet directory.
+* @return string The URL of the file.
+*/
+function get_theme_file_uri( $file = '' ) {
+	$file = ltrim( $file, '/' );
+	if ( empty( $file ) ) {
+		$url = get_stylesheet_directory_uri();
+	} elseif ( file_exists( get_stylesheet_directory() . '/' . $file ) ) {
+		$url = get_stylesheet_directory_uri() . '/' . $file;
+	} else {
+		$url = get_template_directory_uri() . '/' . $file;
+	}
+	/**
+	 * Filters the URL to a file in the theme.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $url  The file URL.
+	 * @param string $file The requested file to search for.
+	 */
+	return apply_filters( 'theme_file_uri', $url, $file );
+}
+/**
+* Retrieves the URL of a file in the parent theme.
+*
+* @since 4.7.0
+*
+* @param string $file Optional. File to return the URL for in the template directory.
+* @return string The URL of the file.
+*/
+function get_parent_theme_file_uri( $file = '' ) {
+	$file = ltrim( $file, '/' );
+	if ( empty( $file ) ) {
+		$url = get_template_directory_uri();
+	} else {
+		$url = get_template_directory_uri() . '/' . $file;
+	}
+	/**
+	 * Filters the URL to a file in the parent theme.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $url  The file URL.
+	 * @param string $file The requested file to search for.
+	 */
+	return apply_filters( 'parent_theme_file_uri', $url, $file );
+}
+/**
+* Retrieves the path of a file in the theme.
+*
+* Searches in the stylesheet directory before the template directory so themes
+* which inherit from a parent theme can just override one file.
+*
+* @since 4.7.0
+*
+* @param string $file Optional. File to search for in the stylesheet directory.
+* @return string The path of the file.
+*/
+function get_theme_file_path( $file = '' ) {
+	$file = ltrim( $file, '/' );
+	if ( empty( $file ) ) {
+		$path = get_stylesheet_directory();
+	} elseif ( file_exists( get_stylesheet_directory() . '/' . $file ) ) {
+		$path = get_stylesheet_directory() . '/' . $file;
+	} else {
+		$path = get_template_directory() . '/' . $file;
+	}
+	/**
+	 * Filters the path to a file in the theme.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $path The file path.
+	 * @param string $file The requested file to search for.
+	 */
+	return apply_filters( 'theme_file_path', $path, $file );
+}
+/**
+* Retrieves the path of a file in the parent theme.
+*
+* @since 4.7.0
+*
+* @param string $file Optional. File to return the path for in the template directory.
+* @return string The path of the file.
+*/
+function get_parent_theme_file_path( $file = '' ) {
+	$file = ltrim( $file, '/' );
+	if ( empty( $file ) ) {
+		$path = get_template_directory();
+	} else {
+		$path = get_template_directory() . '/' . $file;
+	}
+	/**
+	 * Filters the path to a file in the parent theme.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string $path The file path.
+	 * @param string $file The requested file to search for.
+	 */
+	return apply_filters( 'parent_theme_file_path', $path, $file );
+}
+/**
+* Retrieves the URL to the privacy policy page.
+*
+* @since 4.9.6
+*
+* @return string The URL to the privacy policy page. Empty string if it doesn't exist.
+*/
+function get_privacy_policy_url() {
+	$url            = '';
+	$policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );
+	if ( ! empty( $policy_page_id ) && get_post_status( $policy_page_id ) === 'publish' ) {
+		$url = (string) get_permalink( $policy_page_id );
+	}
+	/**
+	 * Filters the URL of the privacy policy page.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string $url            The URL to the privacy policy page. Empty string
+	 *                               if it doesn't exist.
+	 * @param int    $policy_page_id The ID of privacy policy page.
+	 */
+	return apply_filters( 'privacy_policy_url', $url, $policy_page_id );
+}
+/**
+* Displays the privacy policy link with formatting, when applicable.
+*
+* @since 4.9.6
+*
+* @param string $before Optional. Display before privacy policy link. Default empty.
+* @param string $after  Optional. Display after privacy policy link. Default empty.
+*/
+function the_privacy_policy_link( $before = '', $after = '' ) {
+	echo get_the_privacy_policy_link( $before, $after );
+}
+/**
+* Returns the privacy policy link with formatting, when applicable.
+*
+* @since 4.9.6
+*
+* @param string $before Optional. Display before privacy policy link. Default empty.
+* @param string $after  Optional. Display after privacy policy link. Default empty.
+*
+* @return string Markup for the link and surrounding elements. Empty string if it
+*                doesn't exist.
+*/
+function get_the_privacy_policy_link( $before = '', $after = '' ) {
+	$link               = '';
+	$privacy_policy_url = get_privacy_policy_url();
+	$policy_page_id     = (int) get_option( 'wp_page_for_privacy_policy' );
+	$page_title         = ( $policy_page_id ) ? get_the_title( $policy_page_id ) : '';
+	if ( $privacy_policy_url && $page_title ) {
+		$link = sprintf(
+			'<a class="privacy-policy-link" href="%s">%s</a>',
+			esc_url( $privacy_policy_url ),
+			esc_html( $page_title )
+		);
+	}
+	/**
+	 * Filters the privacy policy link.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string $link               The privacy policy link. Empty string if it
+	 *                                   doesn't exist.
+	 * @param string $privacy_policy_url The URL of the privacy policy. Empty string
+	 *                                   if it doesn't exist.
+	 */
+	$link = apply_filters( 'the_privacy_policy_link', $link, $privacy_policy_url );
+	if ( $link ) {
+		return $before . $link . $after;
+	}
+	return '';
+}

changeset 7	cf61fcea0001
parent 5	5e2f62d02dcd
child 9	177826044cd9