wp_cache_switch_to_blog_fallback()

Description

Uses · 4

• wp_is_numeric_array()Determines if the variable is a numeric-indexed array.
• wp_cache_init()Sets up Object Cache Global and assigns it.
• wp_cache_add_global_groups()Adds a group or set of groups to the list of global groups.
• wp_cache_add_non_persistent_groups()Adds a group or set of groups to the list of non-persistent groups.

Used by · 1

• wp_cache_switch_to_blog()Used when switch_to_blog() and restore_current_blog() are called, but only when a persistent object cache drop-in plugin has omitted the wp_cache_switch_to_blog() function that was introduced in 3.5.0.

Source

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611function wp_cache_switch_to_blog_fallback() {612	global $wp_object_cache;613 614	$global_groups         = false;615	$non_persistent_groups = false;616 617	if ( is_object( $wp_object_cache ) && isset( $wp_object_cache->global_groups ) && is_array( $wp_object_cache->global_groups ) ) {618 619		// Get the global groups as they are.620		$group_names = $wp_object_cache->global_groups;621 622		// Get global group keys if non-numeric array.623		if ( ! wp_is_numeric_array( $group_names ) ) {624			$group_names = array_keys( $group_names );625		}626 627		$global_groups = $group_names;628 629		/*630		 * Non-persistent groups: Check for no_mc_groups first (memcached drop-in).631		 * Fall back to cache structure (default cache).632		 */633		if ( isset( $wp_object_cache->no_mc_groups ) && is_array( $wp_object_cache->no_mc_groups ) && ! empty( $wp_object_cache->no_mc_groups ) ) {634			$non_persistent_groups = $wp_object_cache->no_mc_groups;635		} elseif ( isset( $wp_object_cache->cache ) && is_array( $wp_object_cache->cache ) ) {636			$all_groups            = array_keys( $wp_object_cache->cache );637			$non_persistent_groups = array_values( array_diff( $all_groups, $global_groups ) );638		}639	}640 641	wp_cache_init();642 643	if ( function_exists( 'wp_cache_add_global_groups' ) ) {644		if ( ! is_array( $global_groups ) || empty( $global_groups ) ) {645			$global_groups = array(646				'blog-details',647				'blog-id-cache',648				'blog-lookup',649				'blog_meta',650				'global-posts',651				'image_editor',652				'networks',653				'network-queries',654				'sites',655				'site-details',656				'site-options',657				'site-queries',658				'site-transient',659				'theme_files',660				'translation_files',661				'rss',662				'users',663				'user-queries',664				'user_meta',665				'useremail',666				'userlogins',667				'userslugs',668			);669		}670 671		wp_cache_add_global_groups( $global_groups );672	}673 674	if ( function_exists( 'wp_cache_add_non_persistent_groups' ) ) {675		if ( ! is_array( $non_persistent_groups ) || empty( $non_persistent_groups ) ) {676			$non_persistent_groups = array(677				'counts',678				'plugins',679				'theme_json',680			);681		}682 683		wp_cache_add_non_persistent_groups( $non_persistent_groups );684	}685}

History

Introduced in 7.0.0. Unchanged from 7.0.4 through 7.1.0.

1. 7.0.4
2. 7.1.0

Signature, return type and hooks compared across 2 parsed releases.

About this page

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