Comments: Use wp_cache_get_multiple in WP_Comment_Query.

In the `fill_descendants` method in `WP_Comment_Query`, there is a loop the calls `wp_cache_get` to get `child comments. Instead of getting one key at a time, use `wp_cache_get_multiple` and get all keys at once.

Props spacedmonkey, tillkruess, mukesh27.
Fixes #57803.
Built from https://develop.svn.wordpress.org/trunk@55607


git-svn-id: http://core.svn.wordpress.org/trunk@55119 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-comment-query.php

@@ -1030,13 +1030,19 @@ protected function fill_descendants( $comments ) {
 			$child_ids           = array();
 			$uncached_parent_ids = array();
 			$_parent_ids         = $levels[ $level ];
-			foreach ( $_parent_ids as $parent_id ) {
-				$cache_key        = "get_comment_child_ids:$parent_id:$key:$last_changed";
-				$parent_child_ids = wp_cache_get( $cache_key, 'comment-queries' );
-				if ( false !== $parent_child_ids ) {
-					$child_ids = array_merge( $child_ids, $parent_child_ids );
-				} else {
-					$uncached_parent_ids[] = $parent_id;
+			if ( $_parent_ids ) {
+				$cache_keys = array();
+				foreach ( $_parent_ids as $parent_id ) {
+					$cache_keys[ $parent_id ] = "get_comment_child_ids:$parent_id:$key:$last_changed";
+				}
+				$cache_data = wp_cache_get_multiple( array_values( $cache_keys ), 'comment-queries' );
+				foreach ( $_parent_ids as $parent_id ) {
+					$parent_child_ids = $cache_data[ $cache_keys[ $parent_id ] ];
+					if ( false !== $parent_child_ids ) {
+						$child_ids = array_merge( $child_ids, $parent_child_ids );
+					} else {
+						$uncached_parent_ids[] = $parent_id;
+					}
 				}
 			}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55606';
+$wp_version = '6.3-alpha-55607';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.