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Used by	Description
WP_Site_Health::get_test_persistent_object_cache()`wp-admin/includes/class-wp-site-health.php`	Tests if the site uses persistent object cache and recommends to use it if not.
clean_dirsize_cache()`wp-includes/functions.php`	Cleans directory size cache used by recurse_dirsize() .
delete_expired_transients()`wp-includes/option.php`	Deletes all expired transients.
WP_Network::get_by_path()`wp-includes/class-wp-network.php`	Retrieves the closest matching network for a domain and path.
WP_Query::get_posts()`wp-includes/class-wp-query.php`	Retrieves an array of posts based on query variables.
wp_start_object_cache()`wp-includes/load.php`	Starts the WordPress object cache.
set_site_transient()`wp-includes/option.php`	Sets/updates the value of a site transient.
delete_site_transient()`wp-includes/option.php`	Deletes a site transient.
get_site_transient()`wp-includes/option.php`	Retrieves the value of a site transient.
get_transient()`wp-includes/option.php`	Retrieves the value of a transient.
set_transient()`wp-includes/option.php`	Sets/updates the value of a transient.
delete_transient()`wp-includes/option.php`	Deletes a transient.
recurse_dirsize()`wp-includes/functions.php`	Gets the size of a directory recursively.

wp_using_ext_object_cache( bool $using = null ): bool