diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/link-template.php
--- a/wp/wp-includes/link-template.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/link-template.php	Tue Dec 15 13:49:49 2020 +0100
@@ -37,7 +37,7 @@
  *
  * @since 2.2.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @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)
@@ -100,7 +100,6 @@
  *
  * @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|false The permalink URL or false if post does not exist.
  */
 function get_the_permalink( $post = 0, $leavename = false ) {
@@ -131,7 +130,7 @@
 		$leavename ? '' : '%pagename%',
 	);
 
-	if ( is_object( $post ) && isset( $post->filter ) && 'sample' == $post->filter ) {
+	if ( is_object( $post ) && isset( $post->filter ) && 'sample' === $post->filter ) {
 		$sample = true;
 	} else {
 		$post   = get_post( $post );
@@ -142,11 +141,11 @@
 		return false;
 	}
 
-	if ( $post->post_type == 'page' ) {
+	if ( 'page' === $post->post_type ) {
 		return get_page_link( $post, $leavename, $sample );
-	} elseif ( $post->post_type == 'attachment' ) {
+	} elseif ( 'attachment' === $post->post_type ) {
 		return get_attachment_link( $post, $leavename );
-	} elseif ( in_array( $post->post_type, get_post_types( array( '_builtin' => false ) ) ) ) {
+	} elseif ( in_array( $post->post_type, get_post_types( array( '_builtin' => false ) ), true ) ) {
 		return get_post_permalink( $post, $leavename, $sample );
 	}
 
@@ -165,8 +164,7 @@
 	 */
 	$permalink = apply_filters( 'pre_post_link', $permalink, $post, $leavename );
 
-	if ( '' != $permalink && ! in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft', 'future' ) ) ) {
-		$unixtime = strtotime( $post->post_date );
+	if ( $permalink && ! in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft', 'future' ), true ) ) {
 
 		$category = '';
 		if ( strpos( $permalink, '%category%' ) !== false ) {
@@ -196,8 +194,8 @@
 					$category = get_category_parents( $category_object->parent, false, '/', true ) . $category;
 				}
 			}
-			// show default category in permalinks, without
-			// having to assign it explicitly
+			// Show default category in permalinks,
+			// without having to assign it explicitly.
 			if ( empty( $category ) ) {
 				$default_category = get_term( get_option( 'default_category' ), 'category' );
 				if ( $default_category && ! is_wp_error( $default_category ) ) {
@@ -212,9 +210,11 @@
 			$author     = $authordata->user_nicename;
 		}
 
-		$date           = explode( ' ', date( 'Y m d H i s', $unixtime ) );
-		$rewritereplace =
-		array(
+		// This is not an API call because the permalink is based on the stored post_date value,
+		// which should be parsed as local time regardless of the default PHP timezone.
+		$date = explode( ' ', str_replace( array( '-', ':' ), ' ', $post->post_date ) );
+
+		$rewritereplace = array(
 			$date[0],
 			$date[1],
 			$date[2],
@@ -227,9 +227,11 @@
 			$author,
 			$post->post_name,
 		);
-		$permalink      = home_url( str_replace( $rewritecode, $rewritereplace, $permalink ) );
-		$permalink      = user_trailingslashit( $permalink, 'single' );
-	} else { // if they're not using the fancy permalink option
+
+		$permalink = home_url( str_replace( $rewritecode, $rewritereplace, $permalink ) );
+		$permalink = user_trailingslashit( $permalink, 'single' );
+
+	} else { // If they're not using the fancy permalink option.
 		$permalink = home_url( '?p=' . $post->ID );
 	}
 
@@ -252,11 +254,11 @@
  *
  * @since 3.0.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param int|WP_Post $id        Optional. Post ID or post object. Default is the global `$post`.
- * @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.
+ * @param bool        $leavename Optional. Whether to keep post name. Default false.
+ * @param bool        $sample    Optional. Is it a sample permalink. Default false.
  * @return string|WP_Error The post permalink.
  */
 function get_post_permalink( $id = 0, $leavename = false, $sample = false ) {
@@ -272,7 +274,7 @@
 
 	$slug = $post->post_name;
 
-	$draft_or_pending = get_post_status( $post ) && in_array( get_post_status( $post ), 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' ), true );
 
 	$post_type = get_post_type_object( $post->post_type );
 
@@ -329,7 +331,7 @@
 function get_page_link( $post = false, $leavename = false, $sample = false ) {
 	$post = get_post( $post );
 
-	if ( 'page' == get_option( 'show_on_front' ) && $post->ID == get_option( 'page_on_front' ) ) {
+	if ( 'page' === get_option( 'show_on_front' ) && get_option( 'page_on_front' ) == $post->ID ) {
 		$link = home_url( '/' );
 	} else {
 		$link = _get_page_link( $post, $leavename, $sample );
@@ -355,7 +357,7 @@
  * @since 2.1.0
  * @access private
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @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.
@@ -368,7 +370,7 @@
 
 	$post = get_post( $post );
 
-	$draft_or_pending = in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ) );
+	$draft_or_pending = in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft' ), true );
 
 	$link = $wp_rewrite->get_page_permastruct();
 
@@ -401,7 +403,7 @@
  *
  * @since 2.0.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @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.
@@ -414,19 +416,19 @@
 
 	$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() ) ) {
+	if ( $parent && ! in_array( $parent->post_type, get_post_types(), true ) ) {
 		$parent = false;
 	}
 
 	if ( $wp_rewrite->using_permalinks() && $parent ) {
-		if ( 'page' == $parent->post_type ) {
-			$parentlink = _get_page_link( $post->post_parent ); // Ignores page_on_front
+		if ( 'page' === $parent->post_type ) {
+			$parentlink = _get_page_link( $post->post_parent ); // Ignores page_on_front.
 		} else {
 			$parentlink = get_permalink( $post->post_parent );
 		}
 
 		if ( is_numeric( $post->post_name ) || false !== strpos( get_option( 'permalink_structure' ), '%category%' ) ) {
-			$name = 'attachment/' . $post->post_name; // <permalink>/<int>/ is paged so we use the explicit attachment marker
+			$name = 'attachment/' . $post->post_name; // <permalink>/<int>/ is paged so we use the explicit attachment marker.
 		} else {
 			$name = $post->post_name;
 		}
@@ -462,9 +464,9 @@
  *
  * @since 1.5.0
  *
- * @global WP_Rewrite $wp_rewrite
- *
- * @param int|bool $year False for current year or year for permalink.
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ *
+ * @param int|false $year Integer of year. False for current year.
  * @return string The permalink for the specified year archive.
  */
 function get_year_link( $year ) {
@@ -496,10 +498,10 @@
  *
  * @since 1.0.0
  *
- * @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.
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ *
+ * @param int|false $year  Integer of year. False for current year.
+ * @param int|false $month Integer of month. False for current month.
  * @return string The permalink for the specified month and year archive.
  */
 function get_month_link( $year, $month ) {
@@ -536,11 +538,11 @@
  *
  * @since 1.0.0
  *
- * @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.
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ *
+ * @param int|false $year  Integer of year. False for current year.
+ * @param int|false $month Integer of month. False for current month.
+ * @param int|false $day   Integer of day. False for current day.
  * @return string The permalink for the specified day, month, and year archive.
  */
 function get_day_link( $year, $month, $day ) {
@@ -584,7 +586,8 @@
  * @since 3.0.0
  *
  * @param string $anchor The link's anchor text.
- * @param string $feed   Optional. Feed type. Default empty.
+ * @param string $feed   Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                       Default is the value of get_default_feed().
  */
 function the_feed_link( $anchor, $feed = '' ) {
 	$link = '<a href="' . esc_url( get_feed_link( $feed ) ) . '">' . $anchor . '</a>';
@@ -595,8 +598,8 @@
 	 * @since 3.0.0
 	 *
 	 * @param string $link The complete anchor tag for a feed link.
-	 * @param string $feed The feed type, or an empty string for the
-	 *                     default feed type.
+	 * @param string $feed The feed type. Possible values include 'rss2', 'atom',
+	 *                     or an empty string for the default feed type.
 	 */
 	echo apply_filters( 'the_feed_link', $link, $feed );
 }
@@ -606,16 +609,18 @@
  *
  * @since 1.5.0
  *
- * @global WP_Rewrite $wp_rewrite
- *
- * @param string $feed Optional. Feed type. Default empty.
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ *
+ * @param string $feed Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                     Default is the value of get_default_feed().
  * @return string The feed permalink.
  */
 function get_feed_link( $feed = '' ) {
 	global $wp_rewrite;
 
 	$permalink = $wp_rewrite->get_feed_permastruct();
-	if ( '' != $permalink ) {
+
+	if ( '' !== $permalink ) {
 		if ( false !== strpos( $feed, 'comments_' ) ) {
 			$feed      = str_replace( 'comments_', '', $feed );
 			$permalink = $wp_rewrite->get_comment_feed_permastruct();
@@ -646,7 +651,8 @@
 	 * @since 1.5.0
 	 *
 	 * @param string $output The feed permalink.
-	 * @param string $feed   Feed type.
+	 * @param string $feed   The feed type. Possible values include 'rss2', 'atom',
+	 *                       or an empty string for the default feed type.
 	 */
 	return apply_filters( 'feed_link', $output, $feed );
 }
@@ -657,7 +663,8 @@
  * @since 2.2.0
  *
  * @param int    $post_id Optional. Post ID. Default is the ID of the global `$post`.
- * @param string $feed    Optional. Feed type. Default empty.
+ * @param string $feed    Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                        Default is the value of get_default_feed().
  * @return string The permalink for the comments feed for the given post.
  */
 function get_post_comments_feed_link( $post_id = 0, $feed = '' ) {
@@ -674,8 +681,8 @@
 	$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' ) ) {
+	if ( get_option( 'permalink_structure' ) ) {
+		if ( 'page' === get_option( 'show_on_front' ) && get_option( 'page_on_front' ) == $post_id ) {
 			$url = _get_page_link( $post_id );
 		} else {
 			$url = get_permalink( $post_id );
@@ -683,13 +690,13 @@
 
 		if ( $unattached ) {
 			$url = home_url( '/feed/' );
-			if ( $feed !== get_default_feed() ) {
+			if ( get_default_feed() !== $feed ) {
 				$url .= "$feed/";
 			}
 			$url = add_query_arg( 'attachment_id', $post_id, $url );
 		} else {
 			$url = trailingslashit( $url ) . 'feed';
-			if ( $feed != get_default_feed() ) {
+			if ( get_default_feed() != $feed ) {
 				$url .= "/$feed";
 			}
 			$url = user_trailingslashit( $url, 'single_feed' );
@@ -703,7 +710,7 @@
 				),
 				home_url( '/' )
 			);
-		} elseif ( 'page' == $post->post_type ) {
+		} elseif ( 'page' === $post->post_type ) {
 			$url = add_query_arg(
 				array(
 					'feed'    => $feed,
@@ -743,7 +750,8 @@
  *
  * @param string $link_text Optional. Descriptive link text. Default 'Comments Feed'.
  * @param int    $post_id   Optional. Post ID. Default is the ID of the global `$post`.
- * @param string $feed      Optional. Feed format. Default empty.
+ * @param string $feed      Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                          Default is the value of get_default_feed().
  */
 function post_comments_feed_link( $link_text = '', $post_id = '', $feed = '' ) {
 	$url = get_post_comments_feed_link( $post_id, $feed );
@@ -759,7 +767,8 @@
 	 *
 	 * @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.
+	 * @param string $feed    The feed type. Possible values include 'rss2', 'atom',
+	 *                        or an empty string for the default feed type.
 	 */
 	echo apply_filters( 'post_comments_feed_link_html', $link, $post_id, $feed );
 }
@@ -773,7 +782,8 @@
  * @since 2.5.0
  *
  * @param int    $author_id Author ID.
- * @param string $feed      Optional. Feed type. Default empty.
+ * @param string $feed      Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                          Default is the value of get_default_feed().
  * @return string Link to the feed for the author specified by $author_id.
  */
 function get_author_feed_link( $author_id, $feed = '' ) {
@@ -784,11 +794,11 @@
 		$feed = get_default_feed();
 	}
 
-	if ( '' == $permalink_structure ) {
+	if ( ! $permalink_structure ) {
 		$link = home_url( "?feed=$feed&amp;author=" . $author_id );
 	} else {
 		$link = get_author_posts_url( $author_id );
-		if ( $feed == get_default_feed() ) {
+		if ( get_default_feed() == $feed ) {
 			$feed_link = 'feed';
 		} else {
 			$feed_link = "feed/$feed";
@@ -803,7 +813,7 @@
 	 * @since 1.5.1
 	 *
 	 * @param string $link The author feed link.
-	 * @param string $feed Feed type.
+	 * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
 	 */
 	$link = apply_filters( 'author_feed_link', $link, $feed );
 
@@ -819,7 +829,8 @@
  * @since 2.5.0
  *
  * @param int    $cat_id Category ID.
- * @param string $feed   Optional. Feed type. Default empty.
+ * @param string $feed   Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                       Default is the value of get_default_feed().
  * @return string Link to the feed for the category specified by $cat_id.
  */
 function get_category_feed_link( $cat_id, $feed = '' ) {
@@ -836,7 +847,8 @@
  *
  * @param int    $term_id  Term ID.
  * @param string $taxonomy Optional. Taxonomy of `$term_id`. Default 'category'.
- * @param string $feed     Optional. Feed type. Default empty.
+ * @param string $feed     Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                         Default is the value of get_default_feed().
  * @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 = '' ) {
@@ -854,10 +866,10 @@
 
 	$permalink_structure = get_option( 'permalink_structure' );
 
-	if ( '' == $permalink_structure ) {
-		if ( 'category' == $taxonomy ) {
+	if ( ! $permalink_structure ) {
+		if ( 'category' === $taxonomy ) {
 			$link = home_url( "?feed=$feed&amp;cat=$term_id" );
-		} elseif ( 'post_tag' == $taxonomy ) {
+		} elseif ( 'post_tag' === $taxonomy ) {
 			$link = home_url( "?feed=$feed&amp;tag=$term->slug" );
 		} else {
 			$t    = get_taxonomy( $taxonomy );
@@ -865,7 +877,7 @@
 		}
 	} else {
 		$link = get_term_link( $term_id, $term->taxonomy );
-		if ( $feed == get_default_feed() ) {
+		if ( get_default_feed() == $feed ) {
 			$feed_link = 'feed';
 		} else {
 			$feed_link = "feed/$feed";
@@ -874,24 +886,24 @@
 		$link = trailingslashit( $link ) . user_trailingslashit( $feed_link, 'feed' );
 	}
 
-	if ( 'category' == $taxonomy ) {
+	if ( 'category' === $taxonomy ) {
 		/**
 		 * Filters the category feed link.
 		 *
 		 * @since 1.5.1
 		 *
 		 * @param string $link The category feed link.
-		 * @param string $feed Feed type.
+		 * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
 		 */
 		$link = apply_filters( 'category_feed_link', $link, $feed );
-	} elseif ( 'post_tag' == $taxonomy ) {
+	} elseif ( 'post_tag' === $taxonomy ) {
 		/**
 		 * Filters the post tag feed link.
 		 *
 		 * @since 2.3.0
 		 *
 		 * @param string $link The tag feed link.
-		 * @param string $feed Feed type.
+		 * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
 		 */
 		$link = apply_filters( 'tag_feed_link', $link, $feed );
 	} else {
@@ -900,8 +912,8 @@
 		 *
 		 * @since 3.0.0
 		 *
-		 * @param string $link The taxonomy feed link.
-		 * @param string $feed Feed type.
+		 * @param string $link     The taxonomy feed link.
+		 * @param string $feed     Feed type. Possible values include 'rss2', 'atom'.
 		 * @param string $taxonomy The taxonomy name.
 		 */
 		$link = apply_filters( 'taxonomy_feed_link', $link, $feed, $taxonomy );
@@ -916,7 +928,8 @@
  * @since 2.3.0
  *
  * @param int    $tag_id Tag ID.
- * @param string $feed   Optional. Feed type. Default empty.
+ * @param string $feed   Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                       Default is the value of get_default_feed().
  * @return string The feed permalink for the given tag.
  */
 function get_tag_feed_link( $tag_id, $feed = '' ) {
@@ -948,7 +961,7 @@
  *
  * @since 2.7.0
  *
- * @param string  $link   Optional. Anchor text. Default empty.
+ * @param string  $link   Optional. Anchor text. If empty, default is 'Edit This'. Default empty.
  * @param string  $before Optional. Display before edit link. Default empty.
  * @param string  $after  Optional. Display after edit link. Default empty.
  * @param WP_Term $tag    Optional. Term object. If null, the queried object will be inspected.
@@ -971,7 +984,7 @@
  * Retrieves the URL for editing a given term.
  *
  * @since 3.1.0
- * @since 4.5.0 The `$taxonomy` argument was made optional.
+ * @since 4.5.0 The `$taxonomy` parameter was made optional.
  *
  * @param int    $term_id     Term ID.
  * @param string $taxonomy    Optional. Taxonomy. Defaults to the taxonomy of the term identified
@@ -1027,11 +1040,11 @@
  *
  * @since 3.1.0
  *
- * @param string $link   Optional. Anchor text. Default empty.
- * @param string $before Optional. Display before edit link. Default empty.
- * @param string $after  Optional. Display after edit link. Default empty.
- * @param object $term   Optional. Term object. If null, the queried object will be inspected. Default null.
- * @param bool   $echo   Optional. Whether or not to echo the return. Default true.
+ * @param string  $link   Optional. Anchor text. If empty, default is 'Edit This'. Default empty.
+ * @param string  $before Optional. Display before edit link. Default empty.
+ * @param string  $after  Optional. Display after edit link. Default empty.
+ * @param WP_Term $term   Optional. Term object. If null, the queried object will be inspected. Default null.
+ * @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 ) {
@@ -1074,9 +1087,9 @@
 /**
  * Retrieves the permalink for a search.
  *
- * @since  3.0.0
- *
- * @global WP_Rewrite $wp_rewrite
+ * @since 3.0.0
+ *
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param string $query Optional. The query string to use. If empty the current query is used. Default empty.
  * @return string The search permalink.
@@ -1117,10 +1130,11 @@
  *
  * @since 2.5.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param string $search_query Optional. Search query. Default empty.
- * @param string $feed         Optional. Feed type. Default empty.
+ * @param string $feed         Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                             Default is the value of get_default_feed().
  * @return string The search results feed permalink.
  */
 function get_search_feed_link( $search_query = '', $feed = '' ) {
@@ -1146,7 +1160,7 @@
 	 * @since 2.5.0
 	 *
 	 * @param string $link Search feed link.
-	 * @param string $feed Feed type.
+	 * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
 	 * @param string $type The search type. One of 'posts' or 'comments'.
 	 */
 	return apply_filters( 'search_feed_link', $link, $feed, 'posts' );
@@ -1157,10 +1171,11 @@
  *
  * @since 2.5.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param string $search_query Optional. Search query. Default empty.
- * @param string $feed         Optional. Feed type. Default empty.
+ * @param string $feed         Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                             Default is the value of get_default_feed().
  * @return string The comments feed search results permalink.
  */
 function get_search_comments_feed_link( $search_query = '', $feed = '' ) {
@@ -1190,14 +1205,16 @@
  * @since 3.1.0
  * @since 4.5.0 Support for posts was added.
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @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 ) ) {
+
+	$post_type_obj = get_post_type_object( $post_type );
+	if ( ! $post_type_obj ) {
 		return false;
 	}
 
@@ -1205,7 +1222,7 @@
 		$show_on_front  = get_option( 'show_on_front' );
 		$page_for_posts = get_option( 'page_for_posts' );
 
-		if ( 'page' == $show_on_front && $page_for_posts ) {
+		if ( 'page' === $show_on_front && $page_for_posts ) {
 			$link = get_permalink( $page_for_posts );
 		} else {
 			$link = get_home_url();
@@ -1247,7 +1264,8 @@
  * @since 3.1.0
  *
  * @param string $post_type Post type
- * @param string $feed      Optional. Feed type. Default empty.
+ * @param string $feed      Optional. Feed type. Possible values include 'rss2', 'atom'.
+ *                          Default is the value of get_default_feed().
  * @return string|false The post type feed permalink.
  */
 function get_post_type_archive_feed_link( $post_type, $feed = '' ) {
@@ -1256,7 +1274,8 @@
 		$feed = $default_feed;
 	}
 
-	if ( ! $link = get_post_type_archive_link( $post_type ) ) {
+	$link = get_post_type_archive_link( $post_type );
+	if ( ! $link ) {
 		return false;
 	}
 
@@ -1277,7 +1296,7 @@
 	 * @since 3.1.0
 	 *
 	 * @param string $link The post type archive feed link.
-	 * @param string $feed Feed type.
+	 * @param string $feed Feed type. Possible values include 'rss2', 'atom'.
 	 */
 	return apply_filters( 'post_type_archive_feed_link', $link, $feed );
 }
@@ -1338,13 +1357,14 @@
  *                     not allow an editing UI.
  */
 function get_edit_post_link( $id = 0, $context = 'display' ) {
-	if ( ! $post = get_post( $id ) ) {
+	$post = get_post( $id );
+	if ( ! $post ) {
 		return;
 	}
 
 	if ( 'revision' === $post->post_type ) {
 		$action = '';
-	} elseif ( 'display' == $context ) {
+	} elseif ( 'display' === $context ) {
 		$action = '&amp;action=edit';
 	} else {
 		$action = '&action=edit';
@@ -1391,11 +1411,13 @@
  * @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 ) ) {
+	$post = get_post( $id );
+	if ( ! $post ) {
 		return;
 	}
 
-	if ( ! $url = get_edit_post_link( $post->ID ) ) {
+	$url = get_edit_post_link( $post->ID );
+	if ( ! $url ) {
 		return;
 	}
 
@@ -1426,7 +1448,7 @@
  *
  * @param int|WP_Post $id           Optional. Post ID or post object. Default is the global `$post`.
  * @param string      $deprecated   Not used.
- * @param bool        $force_delete Optional. Whether to bypass trash and force deletion. Default false.
+ * @param bool        $force_delete Optional. Whether to bypass Trash and force deletion. Default false.
  * @return string|void The delete post link URL for the given post.
  */
 function get_delete_post_link( $id = 0, $deprecated = '', $force_delete = false ) {
@@ -1434,7 +1456,8 @@
 		_deprecated_argument( __FUNCTION__, '3.0.0' );
 	}
 
-	if ( ! $post = get_post( $id ) ) {
+	$post = get_post( $id );
+	if ( ! $post ) {
 		return;
 	}
 
@@ -1458,7 +1481,7 @@
 	 *
 	 * @param string $link         The delete link.
 	 * @param int    $post_id      Post ID.
-	 * @param bool   $force_delete Whether to bypass the trash and force deletion. Default false.
+	 * @param bool   $force_delete Whether to bypass the Trash and force deletion. Default false.
 	 */
 	return apply_filters( 'get_delete_post_link', wp_nonce_url( $delete_link, "$action-post_{$post->ID}" ), $post->ID, $force_delete );
 }
@@ -1529,7 +1552,7 @@
  *
  * @since 2.7.0
  *
- * @param int|stdClass $link Optional. Bookmark ID. Default is the id of the current bookmark.
+ * @param int|stdClass $link Optional. Bookmark ID. Default is the ID of the current bookmark.
  * @return string|void The edit bookmark link URL.
  */
 function get_edit_bookmark_link( $link = 0 ) {
@@ -1557,7 +1580,7 @@
  *
  * @since 2.7.0
  *
- * @param string $link     Optional. Anchor text. Default empty.
+ * @param string $link     Optional. Anchor text. If empty, default is 'Edit This'. Default empty.
  * @param string $before   Optional. Display before edit link. Default empty.
  * @param string $after    Optional. Display after edit link. Default empty.
  * @param int    $bookmark Optional. Bookmark ID. Default is the current bookmark.
@@ -1626,7 +1649,9 @@
 	return apply_filters( 'get_edit_user_link', $link, $user->ID );
 }
 
-// Navigation links
+//
+// Navigation links.
+//
 
 /**
  * Retrieves the previous post that is adjacent to the current post.
@@ -1677,7 +1702,8 @@
 function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previous = true, $taxonomy = 'category' ) {
 	global $wpdb;
 
-	if ( ( ! $post = get_post() ) || ! taxonomy_exists( $taxonomy ) ) {
+	$post = get_post();
+	if ( ! $post || ! taxonomy_exists( $taxonomy ) ) {
 		return null;
 	}
 
@@ -1690,7 +1716,15 @@
 	if ( ! empty( $excluded_terms ) && ! is_array( $excluded_terms ) ) {
 		// Back-compat, $excluded_terms used to be $excluded_categories with IDs separated by " and ".
 		if ( false !== strpos( $excluded_terms, ' and ' ) ) {
-			_deprecated_argument( __FUNCTION__, '3.3.0', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
+			_deprecated_argument(
+				__FUNCTION__,
+				'3.3.0',
+				sprintf(
+					/* translators: %s: The word 'and'. */
+					__( 'Use commas instead of %s to separate excluded terms.' ),
+					"'and'"
+				)
+			);
 			$excluded_terms = explode( ' and ', $excluded_terms );
 		} else {
 			$excluded_terms = explode( ',', $excluded_terms );
@@ -1859,7 +1893,8 @@
  * @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();
+	if ( $previous && is_attachment() && $post ) {
 		$post = get_post( $post->post_parent );
 	} else {
 		$post = get_adjacent_post( $in_same_term, $excluded_terms, $previous, $taxonomy );
@@ -2087,6 +2122,7 @@
  * 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. Default '&laquo; %link'.
@@ -2187,7 +2223,7 @@
  *
  * @since 1.5.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param int  $pagenum Optional. Page number. Default 1.
  * @param bool $escape  Optional. Whether to escape the URL for display, with esc_url(). Defaults to true.
@@ -2233,7 +2269,7 @@
 
 		$base = trailingslashit( get_bloginfo( 'url' ) );
 
-		if ( $wp_rewrite->using_index_permalinks() && ( $pagenum > 1 || '' != $request ) ) {
+		if ( $wp_rewrite->using_index_permalinks() && ( $pagenum > 1 || '' !== $request ) ) {
 			$base .= $wp_rewrite->index . '/';
 		}
 
@@ -2293,8 +2329,8 @@
  *
  * @since 0.71
  *
- * @param int   $max_page Optional. Max pages. Default 0.
- * @param bool  $echo     Optional. Whether to echo the link. Default true.
+ * @param int  $max_page Optional. Max pages. Default 0.
+ * @param bool $echo     Optional. Whether to echo the link. Default true.
  * @return string|void The link URL for next posts page if `$echo = false`.
  */
 function next_posts( $max_page = 0, $echo = true ) {
@@ -2313,7 +2349,7 @@
  * @since 2.7.0
  *
  * @global int      $paged
- * @global WP_Query $wp_query
+ * @global WP_Query $wp_query WordPress Query object.
  *
  * @param string $label    Content for link text.
  * @param int    $max_page Optional. Max pages. Default 0.
@@ -2451,7 +2487,7 @@
  *
  * @since 2.8.0
  *
- * @global WP_Query $wp_query
+ * @global WP_Query $wp_query WordPress Query object.
  *
  * @param string|array $args {
  *     Optional. Arguments to build the post pages link navigation.
@@ -2480,7 +2516,7 @@
 		$max_num_pages = $wp_query->max_num_pages;
 		$paged         = get_query_var( 'paged' );
 
-		//only have sep if there's both prev and next results
+		// Only have sep if there's both prev and next results.
 		if ( $paged < 2 || $paged >= $max_num_pages ) {
 			$args['sep'] = '';
 		}
@@ -2514,6 +2550,8 @@
  *
  * @since 4.1.0
  * @since 4.4.0 Introduced the `in_same_term`, `excluded_terms`, and `taxonomy` arguments.
+ * @since 5.3.0 Added the `aria_label` parameter.
+ * @since 5.5.0 Added the `class` parameter.
  *
  * @param array $args {
  *     Optional. Default post navigation arguments. Default empty array.
@@ -2523,11 +2561,18 @@
  *     @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'.
+ *     @type string       $screen_reader_text Screen reader text for the nav element. Default 'Post navigation'.
+ *     @type string       $aria_label         ARIA label text for the nav element. Default 'Posts'.
+ *     @type string       $class              Custom class for the nav element. Default 'post-navigation'.
  * }
  * @return string Markup for post links.
  */
 function get_the_post_navigation( $args = array() ) {
+	// Make sure the nav element has an aria-label attribute: fallback to the screen reader text.
+	if ( ! empty( $args['screen_reader_text'] ) && empty( $args['aria_label'] ) ) {
+		$args['aria_label'] = $args['screen_reader_text'];
+	}
+
 	$args = wp_parse_args(
 		$args,
 		array(
@@ -2537,6 +2582,8 @@
 			'excluded_terms'     => '',
 			'taxonomy'           => 'category',
 			'screen_reader_text' => __( 'Post navigation' ),
+			'aria_label'         => __( 'Posts' ),
+			'class'              => 'post-navigation',
 		)
 	);
 
@@ -2560,7 +2607,7 @@
 
 	// Only add markup if there's somewhere to navigate to.
 	if ( $previous || $next ) {
-		$navigation = _navigation_markup( $previous . $next, 'post-navigation', $args['screen_reader_text'] );
+		$navigation = _navigation_markup( $previous . $next, $args['class'], $args['screen_reader_text'], $args['aria_label'] );
 	}
 
 	return $navigation;
@@ -2582,6 +2629,8 @@
  * Returns the navigation to next/previous set of posts, when applicable.
  *
  * @since 4.1.0
+ * @since 5.3.0 Added the `aria_label` parameter.
+ * @since 5.5.0 Added the `class` parameter.
  *
  * @global WP_Query $wp_query WordPress Query object.
  *
@@ -2592,8 +2641,10 @@
  *                                      Default 'Older posts'.
  *     @type string $next_text          Anchor text to display in the next posts link.
  *                                      Default 'Newer posts'.
- *     @type string $screen_reader_text Screen reader text for nav element.
+ *     @type string $screen_reader_text Screen reader text for the nav element.
  *                                      Default 'Posts navigation'.
+ *     @type string $aria_label         ARIA label text for the nav element. Default 'Posts'.
+ *     @type string $class              Custom class for the nav element. Default 'posts-navigation'.
  * }
  * @return string Markup for posts links.
  */
@@ -2602,12 +2653,19 @@
 
 	// Don't print empty markup if there's only one page.
 	if ( $GLOBALS['wp_query']->max_num_pages > 1 ) {
+		// Make sure the nav element has an aria-label attribute: fallback to the screen reader text.
+		if ( ! empty( $args['screen_reader_text'] ) && empty( $args['aria_label'] ) ) {
+			$args['aria_label'] = $args['screen_reader_text'];
+		}
+
 		$args = wp_parse_args(
 			$args,
 			array(
 				'prev_text'          => __( 'Older posts' ),
 				'next_text'          => __( 'Newer posts' ),
 				'screen_reader_text' => __( 'Posts navigation' ),
+				'aria_label'         => __( 'Posts' ),
+				'class'              => 'posts-navigation',
 			)
 		);
 
@@ -2622,7 +2680,7 @@
 			$navigation .= '<div class="nav-next">' . $next_link . '</div>';
 		}
 
-		$navigation = _navigation_markup( $navigation, 'posts-navigation', $args['screen_reader_text'] );
+		$navigation = _navigation_markup( $navigation, $args['class'], $args['screen_reader_text'], $args['aria_label'] );
 	}
 
 	return $navigation;
@@ -2644,12 +2702,16 @@
  * Retrieves a paginated navigation to next/previous set of posts, when applicable.
  *
  * @since 4.1.0
+ * @since 5.3.0 Added the `aria_label` parameter.
+ * @since 5.5.0 Added the `class` parameter.
  *
  * @param array $args {
  *     Optional. Default pagination arguments, see paginate_links().
  *
  *     @type string $screen_reader_text Screen reader text for navigation element.
  *                                      Default 'Posts navigation'.
+ *     @type string $aria_label         ARIA label text for the nav element. Default 'Posts'.
+ *     @type string $class              Custom class for the nav element. Default 'pagination'.
  * }
  * @return string Markup for pagination links.
  */
@@ -2658,6 +2720,11 @@
 
 	// Don't print empty markup if there's only one page.
 	if ( $GLOBALS['wp_query']->max_num_pages > 1 ) {
+		// Make sure the nav element has an aria-label attribute: fallback to the screen reader text.
+		if ( ! empty( $args['screen_reader_text'] ) && empty( $args['aria_label'] ) ) {
+			$args['aria_label'] = $args['screen_reader_text'];
+		}
+
 		$args = wp_parse_args(
 			$args,
 			array(
@@ -2665,11 +2732,13 @@
 				'prev_text'          => _x( 'Previous', 'previous set of posts' ),
 				'next_text'          => _x( 'Next', 'next set of posts' ),
 				'screen_reader_text' => __( 'Posts navigation' ),
+				'aria_label'         => __( 'Posts' ),
+				'class'              => 'pagination',
 			)
 		);
 
 		// Make sure we get a string back. Plain is the next best thing.
-		if ( isset( $args['type'] ) && 'array' == $args['type'] ) {
+		if ( isset( $args['type'] ) && 'array' === $args['type'] ) {
 			$args['type'] = 'plain';
 		}
 
@@ -2677,7 +2746,7 @@
 		$links = paginate_links( $args );
 
 		if ( $links ) {
-			$navigation = _navigation_markup( $links, 'pagination', $args['screen_reader_text'] );
+			$navigation = _navigation_markup( $links, $args['class'], $args['screen_reader_text'], $args['aria_label'] );
 		}
 	}
 
@@ -2700,20 +2769,28 @@
  * Wraps passed links in navigational markup.
  *
  * @since 4.1.0
+ * @since 5.3.0 Added the `aria_label` parameter.
  * @access private
  *
  * @param string $links              Navigational links.
- * @param string $class              Optional. Custom class for nav element. Default: 'posts-navigation'.
- * @param string $screen_reader_text Optional. Screen reader text for nav element. Default: 'Posts navigation'.
+ * @param string $class              Optional. Custom class for the nav element.
+ *                                   Default 'posts-navigation'.
+ * @param string $screen_reader_text Optional. Screen reader text for the nav element.
+ *                                   Default 'Posts navigation'.
+ * @param string $aria_label         Optional. ARIA label for the nav element.
+ *                                   Defaults to the value of `$screen_reader_text`.
  * @return string Navigation template tag.
  */
-function _navigation_markup( $links, $class = 'posts-navigation', $screen_reader_text = '' ) {
+function _navigation_markup( $links, $class = 'posts-navigation', $screen_reader_text = '', $aria_label = '' ) {
 	if ( empty( $screen_reader_text ) ) {
 		$screen_reader_text = __( 'Posts navigation' );
 	}
+	if ( empty( $aria_label ) ) {
+		$aria_label = $screen_reader_text;
+	}
 
 	$template = '
-	<nav class="navigation %1$s" role="navigation">
+	<nav class="navigation %1$s" role="navigation" aria-label="%4$s">
 		<h2 class="screen-reader-text">%2$s</h2>
 		<div class="nav-links">%3$s</div>
 	</nav>';
@@ -2722,10 +2799,10 @@
 	 * 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$s):
+	 * class (%1$s), the screen-reader-text value (%2$s), placement of the navigation
+	 * links (%3$s), and ARIA label text if screen-reader-text does not fit that (%4$s):
 	 *
-	 *     <nav class="navigation %1$s" role="navigation">
+	 *     <nav class="navigation %1$s" role="navigation" aria-label="%4$s">
 	 *         <h2 class="screen-reader-text">%2$s</h2>
 	 *         <div class="nav-links">%3$s</div>
 	 *     </nav>
@@ -2738,7 +2815,7 @@
 	 */
 	$template = apply_filters( 'navigation_markup_template', $template, $class );
 
-	return sprintf( $template, sanitize_html_class( $class ), esc_html( $screen_reader_text ), $links );
+	return sprintf( $template, sanitize_html_class( $class ), esc_html( $screen_reader_text ), $links, esc_html( $aria_label ) );
 }
 
 /**
@@ -2746,7 +2823,7 @@
  *
  * @since 2.7.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param int $pagenum  Optional. Page number. Default 1.
  * @param int $max_page Optional. The maximum number of comment pages. Default 0.
@@ -2759,7 +2836,7 @@
 
 	$result = get_permalink();
 
-	if ( 'newest' == get_option( 'default_comments_page' ) ) {
+	if ( 'newest' === get_option( 'default_comments_page' ) ) {
 		if ( $pagenum != $max_page ) {
 			if ( $wp_rewrite->using_permalinks() ) {
 				$result = user_trailingslashit( trailingslashit( $result ) . $wp_rewrite->comments_pagination_base . '-' . $pagenum, 'commentpaged' );
@@ -2792,7 +2869,7 @@
  *
  * @since 2.7.1
  *
- * @global WP_Query $wp_query
+ * @global WP_Query $wp_query WordPress Query object.
  *
  * @param string $label    Optional. Label for link text. Default empty.
  * @param int    $max_page Optional. Max page. Default 0.
@@ -2903,10 +2980,13 @@
  * @see paginate_links()
  * @since 2.7.0
  *
- * @global WP_Rewrite $wp_rewrite
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param string|array $args Optional args. See paginate_links(). Default empty array.
- * @return string|array|void Markup for comment page links or array of comment page links.
+ * @return void|string|array Void if 'echo' argument is true and 'type' is not an array,
+ *                           or if the query is not for an existing single post of any post type.
+ *                           Otherwise, markup for comment page links or array of comment page links,
+ *                           depending on 'type' argument.
  */
 function paginate_comments_links( $args = array() ) {
 	global $wp_rewrite;
@@ -2947,6 +3027,8 @@
  * Retrieves navigation to next/previous set of comments, when applicable.
  *
  * @since 4.4.0
+ * @since 5.3.0 Added the `aria_label` parameter.
+ * @since 5.5.0 Added the `class` parameter.
  *
  * @param array $args {
  *     Optional. Default comments navigation arguments.
@@ -2955,7 +3037,9 @@
  *                                      Default 'Older comments'.
  *     @type string $next_text          Anchor text to display in the next comments link.
  *                                      Default 'Newer comments'.
- *     @type string $screen_reader_text Screen reader text for nav element. Default 'Comments navigation'.
+ *     @type string $screen_reader_text Screen reader text for the nav element. Default 'Comments navigation'.
+ *     @type string $aria_label         ARIA label text for the nav element. Default 'Comments'.
+ *     @type string $class              Custom class for the nav element. Default 'comment-navigation'.
  * }
  * @return string Markup for comments links.
  */
@@ -2964,12 +3048,19 @@
 
 	// Are there comments to navigate through?
 	if ( get_comment_pages_count() > 1 ) {
+		// Make sure the nav element has an aria-label attribute: fallback to the screen reader text.
+		if ( ! empty( $args['screen_reader_text'] ) && empty( $args['aria_label'] ) ) {
+			$args['aria_label'] = $args['screen_reader_text'];
+		}
+
 		$args = wp_parse_args(
 			$args,
 			array(
 				'prev_text'          => __( 'Older comments' ),
 				'next_text'          => __( 'Newer comments' ),
 				'screen_reader_text' => __( 'Comments navigation' ),
+				'aria_label'         => __( 'Comments' ),
+				'class'              => 'comment-navigation',
 			)
 		);
 
@@ -2984,7 +3075,7 @@
 			$navigation .= '<div class="nav-next">' . $next_link . '</div>';
 		}
 
-		$navigation = _navigation_markup( $navigation, 'comment-navigation', $args['screen_reader_text'] );
+		$navigation = _navigation_markup( $navigation, $args['class'], $args['screen_reader_text'], $args['aria_label'] );
 	}
 
 	return $navigation;
@@ -3005,35 +3096,47 @@
  * Retrieves a paginated navigation to next/previous set of comments, when applicable.
  *
  * @since 4.4.0
+ * @since 5.3.0 Added the `aria_label` parameter.
+ * @since 5.5.0 Added the `class` parameter.
  *
  * @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'.
+ *     @type string $screen_reader_text Screen reader text for the nav element. Default 'Comments navigation'.
+ *     @type string $aria_label         ARIA label text for the nav element. Default 'Comments'.
+ *     @type string $class              Custom class for the nav element. Default 'comments-pagination'.
  * }
  * @return string Markup for pagination links.
  */
 function get_the_comments_pagination( $args = array() ) {
-	$navigation   = '';
+	$navigation = '';
+
+	// Make sure the nav element has an aria-label attribute: fallback to the screen reader text.
+	if ( ! empty( $args['screen_reader_text'] ) && empty( $args['aria_label'] ) ) {
+		$args['aria_label'] = $args['screen_reader_text'];
+	}
+
 	$args         = wp_parse_args(
 		$args,
 		array(
 			'screen_reader_text' => __( 'Comments navigation' ),
+			'aria_label'         => __( 'Comments' ),
+			'class'              => 'comments-pagination',
 		)
 	);
 	$args['echo'] = false;
 
 	// Make sure we get a string back. Plain is the next best thing.
-	if ( isset( $args['type'] ) && 'array' == $args['type'] ) {
+	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'] );
+		$navigation = _navigation_markup( $links, $args['class'], $args['screen_reader_text'], $args['aria_label'] );
 	}
 
 	return $navigation;
@@ -3059,9 +3162,9 @@
  *
  * @since 3.0.0
  *
- * @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.
+ * @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 home_url( $path = '', $scheme = null ) {
@@ -3079,10 +3182,10 @@
  *
  * @global string $pagenow
  *
- * @param  int         $blog_id Optional. Site ID. Default null (current site).
- * @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.
+ * @param int         $blog_id Optional. Site ID. Default null (current site).
+ * @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 ) {
@@ -3098,7 +3201,7 @@
 		restore_current_blog();
 	}
 
-	if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ) ) ) {
+	if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ), true ) ) {
 		if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $pagenow ) {
 			$scheme = 'https';
 		} else {
@@ -3298,11 +3401,11 @@
  *
  * @since 2.6.0
  *
- * @param  string $path   Optional. Extra path appended to the end of the URL, including
- *                        the relative directory if $plugin is supplied. Default empty.
- * @param  string $plugin Optional. A full path to a file inside a plugin or mu-plugin.
- *                        The URL will be relative to its directory. Default empty.
- *                        Typically this is done by passing `__FILE__` as the argument.
+ * @param string $path   Optional. Extra path appended to the end of the URL, including
+ *                       the relative directory if $plugin is supplied. Default empty.
+ * @param string $plugin Optional. A full path to a file inside a plugin or mu-plugin.
+ *                       The URL will be relative to its directory. Default empty.
+ *                       Typically this is done by passing `__FILE__` as the argument.
  * @return string Plugins URL link with optional paths appended.
  */
 function plugins_url( $path = '', $plugin = '' ) {
@@ -3321,7 +3424,7 @@
 
 	if ( ! empty( $plugin ) && is_string( $plugin ) ) {
 		$folder = dirname( plugin_basename( $plugin ) );
-		if ( '.' != $folder ) {
+		if ( '.' !== $folder ) {
 			$url .= '/' . ltrim( $folder, '/' );
 		}
 	}
@@ -3367,7 +3470,7 @@
 
 	$current_network = get_network();
 
-	if ( 'relative' == $scheme ) {
+	if ( 'relative' === $scheme ) {
 		$url = $current_network->path;
 	} else {
 		$url = set_url_scheme( 'http://' . $current_network->domain . $current_network->path, $scheme );
@@ -3400,9 +3503,9 @@
  *
  * @since 3.0.0
  *
- * @param  string $path   Optional. Path relative to the home URL. Default empty.
- * @param  string $scheme Optional. Scheme to give the home URL context. Accepts
- *                        'http', 'https', or 'relative'. Default null.
+ * @param string $path   Optional. Path relative to the home URL. Default empty.
+ * @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.
  */
 function network_home_url( $path = '', $scheme = null ) {
@@ -3413,11 +3516,11 @@
 	$current_network = get_network();
 	$orig_scheme     = $scheme;
 
-	if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ) ) ) {
+	if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ), true ) ) {
 		$scheme = is_ssl() && ! is_admin() ? 'https' : 'http';
 	}
 
-	if ( 'relative' == $scheme ) {
+	if ( 'relative' === $scheme ) {
 		$url = $current_network->path;
 	} else {
 		$url = set_url_scheme( 'http://' . $current_network->domain . $current_network->path, $scheme );
@@ -3543,16 +3646,16 @@
  * @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.
+ * @return string URL with chosen scheme.
  */
 function set_url_scheme( $url, $scheme = null ) {
 	$orig_scheme = $scheme;
 
 	if ( ! $scheme ) {
 		$scheme = is_ssl() ? 'https' : 'http';
-	} elseif ( $scheme === 'admin' || $scheme === 'login' || $scheme === 'login_post' || $scheme === 'rpc' ) {
+	} elseif ( 'admin' === $scheme || 'login' === $scheme || 'login_post' === $scheme || 'rpc' === $scheme ) {
 		$scheme = is_ssl() || force_ssl_admin() ? 'https' : 'http';
-	} elseif ( $scheme !== 'http' && $scheme !== 'https' && $scheme !== 'relative' ) {
+	} elseif ( 'http' !== $scheme && 'https' !== $scheme && 'relative' !== $scheme ) {
 		$scheme = is_ssl() ? 'https' : 'http';
 	}
 
@@ -3561,9 +3664,9 @@
 		$url = 'http:' . $url;
 	}
 
-	if ( 'relative' == $scheme ) {
+	if ( 'relative' === $scheme ) {
 		$url = ltrim( preg_replace( '#^\w+://[^/]*#', '', $url ) );
-		if ( $url !== '' && $url[0] === '/' ) {
+		if ( '' !== $url && '/' === $url[0] ) {
 			$url = '/' . ltrim( $url, "/ \t\n\r\0\x0B" );
 		}
 	} else {
@@ -3603,13 +3706,15 @@
 	$user_id = $user_id ? (int) $user_id : get_current_user_id();
 
 	$blogs = get_blogs_of_user( $user_id );
+
 	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 && ( user_can( $user_id, 'manage_network' ) || in_array( $current_blog, array_keys( $blogs ) ) ) ) {
+
+		if ( $current_blog && ( user_can( $user_id, 'manage_network' ) || in_array( $current_blog, array_keys( $blogs ), true ) ) ) {
 			$url = admin_url( $path, $scheme );
 		} else {
 			$active = get_active_blog_for_user( $user_id );
@@ -3695,10 +3800,10 @@
 	$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() ) {
+	if ( get_queried_object_id() === $post->ID ) {
 		$page = get_query_var( 'page', 0 );
 		if ( $page >= 2 ) {
-			if ( '' == get_option( 'permalink_structure' ) ) {
+			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' );
@@ -3757,10 +3862,10 @@
  *
  * @since 3.0.0
  *
- * @param int    $id          Optional. A post or site id. Default is 0, which means the current post or site.
- * @param string $context     Optional. Whether the id is a 'site' id, 'post' id, or 'media' id. If 'post',
+ * @param int    $id          Optional. A post or site ID. Default is 0, which means the current post or site.
+ * @param string $context     Optional. Whether the ID is a 'site' 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 'post'.
+ *                            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
  *                            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
@@ -3770,15 +3875,15 @@
 	/**
 	 * 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.
+	 * Returning a truthy value from the filter will effectively short-circuit
+	 * the shortlink generation process, returning that value instead.
 	 *
 	 * @since 3.0.0
 	 *
-	 * @param bool|string $return      Short-circuit return value. Either false or a URL string.
-	 * @param int         $id          Post ID, or 0 for the current post.
-	 * @param string      $context     The context for the link. One of 'post' or 'query',
-	 * @param bool        $allow_slugs Whether to allow post slugs in the shortlink.
+	 * @param false|string $return      Short-circuit return value. Either false or a URL string.
+	 * @param int          $id          Post ID, or 0 for the current post.
+	 * @param string       $context     The context for the link. One of 'post' or 'query',
+	 * @param bool         $allow_slugs Whether to allow post slugs in the shortlink.
 	 */
 	$shortlink = apply_filters( 'pre_get_shortlink', false, $id, $context, $allow_slugs );
 
@@ -3787,10 +3892,10 @@
 	}
 
 	$post_id = 0;
-	if ( 'query' == $context && is_singular() ) {
+	if ( 'query' === $context && is_singular() ) {
 		$post_id = get_queried_object_id();
 		$post    = get_post( $post_id );
-	} elseif ( 'post' == $context ) {
+	} elseif ( 'post' === $context ) {
 		$post = get_post( $id );
 		if ( ! empty( $post->ID ) ) {
 			$post_id = $post->ID;
@@ -3799,11 +3904,11 @@
 
 	$shortlink = '';
 
-	// Return p= link for all public post types.
+	// Return `?p=` link for all public post types.
 	if ( ! empty( $post_id ) ) {
 		$post_type = get_post_type_object( $post->post_type );
 
-		if ( 'page' === $post->post_type && $post->ID == get_option( 'page_on_front' ) && 'page' == get_option( 'show_on_front' ) ) {
+		if ( 'page' === $post->post_type && get_option( 'page_on_front' ) == $post->ID && 'page' === get_option( 'show_on_front' ) ) {
 			$shortlink = home_url( '/' );
 		} elseif ( $post_type->public ) {
 			$shortlink = home_url( '?p=' . $post_id );
@@ -3932,7 +4037,7 @@
  *     @type array  $processed_args When the function returns, the value will be the processed/sanitized $args
  *                                  plus a "found_avatar" guess. Pass as a reference. Default null.
  * }
- * @return false|string The URL of the avatar we found, or false if we couldn't find an avatar.
+ * @return string|false The URL of the avatar on success, false on failure.
  */
 function get_avatar_url( $id_or_email, $args = null ) {
 	$args = get_avatar_data( $id_or_email, $args );
@@ -3967,8 +4072,8 @@
  *
  * @since 4.2.0
  *
- * @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.
+ * @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.
  * @param array $args {
  *     Optional. Arguments to return instead of the default arguments.
  *
@@ -3990,7 +4095,7 @@
  *                                  plus a "found_avatar" guess. Pass as a reference. Default null.
  *     @type string $extra_attr     HTML attributes to insert in the IMG element. Is not sanitized. Default empty.
  * }
- * @return array $processed_args {
+ * @return array {
  *     Along with the arguments passed in `$args`, this will contain a couple of extra arguments.
  *
  *     @type bool   $found_avatar True if we were able to find an avatar for this user,
@@ -4009,7 +4114,7 @@
 			'force_default'  => false,
 			'rating'         => get_option( 'avatar_rating' ),
 			'scheme'         => null,
-			'processed_args' => null, // if used, should be a reference
+			'processed_args' => null, // If used, should be a reference.
 			'extra_attr'     => '',
 		)
 	);
@@ -4071,9 +4176,9 @@
 	 *
 	 * @since 4.2.0
 	 *
-	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
-	 * @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.
+	 * @param array $args        Arguments passed to get_avatar_data(), after processing.
+	 * @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 );
 
@@ -4083,7 +4188,8 @@
 	}
 
 	$email_hash = '';
-	$user       = $email = false;
+	$user       = false;
+	$email      = false;
 
 	if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
 		$id_or_email = get_comment( $id_or_email );
@@ -4094,17 +4200,17 @@
 		$user = get_user_by( 'id', absint( $id_or_email ) );
 	} elseif ( is_string( $id_or_email ) ) {
 		if ( strpos( $id_or_email, '@md5.gravatar.com' ) ) {
-			// md5 hash
+			// MD5 hash.
 			list( $email_hash ) = explode( '@', $id_or_email );
 		} else {
-			// email address
+			// Email address.
 			$email = $id_or_email;
 		}
 	} elseif ( $id_or_email instanceof WP_User ) {
-		// User Object
+		// User object.
 		$user = $id_or_email;
 	} elseif ( $id_or_email instanceof WP_Post ) {
-		// Post Object
+		// Post object.
 		$user = get_user_by( 'id', (int) $id_or_email->post_author );
 	} elseif ( $id_or_email instanceof WP_Comment ) {
 		if ( ! is_avatar_comment_type( get_comment_type( $id_or_email ) ) ) {
@@ -4162,7 +4268,7 @@
 	 * @since 4.2.0
 	 *
 	 * @param string $url         The URL of the avatar.
-	 * @param mixed  $id_or_email The Gravatar to retrieve. 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 WP_Comment object.
 	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
 	 */
@@ -4173,9 +4279,9 @@
 	 *
 	 * @since 4.2.0
 	 *
-	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
-	 * @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.
+	 * @param array $args        Arguments passed to get_avatar_data(), after processing.
+	 * @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 );
 }
@@ -4348,7 +4454,6 @@
  *
  * @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.
  */