From 9c0dc03f9073a0f99a73d7c9b67ea3b7a94ca8a2 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Tue, 25 May 2021 23:41:57 +0000
Subject: [PATCH] Posts, Post Types: Speed cached `get_pages()` calls.

This improves performance for sites with persistent cache backend having a lot of pages requested via the `get_pages() function, by taking advantage of `wp_cache_get_multiple()` instead of fetching each individual page from the backend cache server one by one.

It also matches the behaviour of `get_pages()` when the pages are retrieved from the database.

Props david.binda, hellofromTonya.
Fixes #51469.
Built from https://develop.svn.wordpress.org/trunk@51018


git-svn-id: http://core.svn.wordpress.org/trunk@50627 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/post.php    | 6 +++++-
 wp-includes/version.php | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/wp-includes/post.php b/wp-includes/post.php
index df0ca10695..e7fae22267 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -5784,10 +5784,13 @@ function get_pages( $args = array() ) {
 	$cache_key = "get_pages:$key:$last_changed";
 	$cache     = wp_cache_get( $cache_key, 'posts' );
 	if ( false !== $cache ) {
+		_prime_post_caches( $cache, false, false );
+
 		// Convert to WP_Post instances.
 		$pages = array_map( 'get_post', $cache );
 		/** This filter is documented in wp-includes/post.php */
 		$pages = apply_filters( 'get_pages', $pages, $parsed_args );
+
 		return $pages;
 	}
 
@@ -5948,6 +5951,7 @@ function get_pages( $args = array() ) {
 
 		/** This filter is documented in wp-includes/post.php */
 		$pages = apply_filters( 'get_pages', array(), $parsed_args );
+
 		return $pages;
 	}
 
@@ -7605,7 +7609,7 @@ function _update_term_count_on_transition_post_status( $new_status, $old_status,
 }
 
 /**
- * Adds any posts from the given IDs to the cache that do not already exist in cache
+ * Adds any posts from the given IDs to the cache that do not already exist in cache.
  *
  * @since 3.4.0
  * @access private
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 49154780e7..a12fd358ff 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-51017';
+$wp_version = '5.8-alpha-51018';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.