Boostrap/Load: Add filter to allow disabling of object cache

In [37626] a filter was added to allow disabling the advanced cache dropin, but no similar filter was added for the object cache dropin. This corrects that oversight.

Fixes #53322.

Built from https://develop.svn.wordpress.org/trunk@51087


git-svn-id: http:https://core.svn.wordpress.org/trunk@50696 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/load.php

@@ -665,7 +665,19 @@ function wp_start_object_cache() {
  static $first_init = true;
 
  // Only perform the following checks once.
- if ( $first_init ) {
+
+ /**
+ * Filters whether to enable loading of the objectcache.php drop-in.
+ *
+ * This filter runs before it can be used by plugins. It is designed for non-web
+ * run-times. If false is returned, object-cache.php will never be loaded.
+ *
+ * @since 5.8.0
+ *
+ * @param bool $enable_object_cache Whether to enable loading object-cache.php (if present).
+ * Default true.
+ */
+ if ( $first_init && apply_filters( 'enable_loading_object_cache_dropin', true ) ) {
  if ( ! function_exists( 'wp_cache_init' ) ) {
  /*
  * This is the normal situation. First-run of this function. No

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-51086';
+$wp_version = '5.8-alpha-51087';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.