function hook_cache_flush

Flush all persistent and static caches.

This hook asks your module to clear all of its static caches, in order to ensure a clean environment for subsequently invoked data rebuilds.

Do NOT use this hook for rebuilding information. Only use it to flush custom caches.

Static caches using drupal_static() do not need to be reset manually. However, all other static variables that do not use drupal_static() must be manually reset.

This hook is invoked by drupal_flush_all_caches(). It runs before module data is updated and before hook_rebuild().

See also

drupal_flush_all_caches()

hook_rebuild()

Related topics

File

core/core.api.php, line 2207

Code

function hook_cache_flush() {
    if (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'update') {
        _update_cache_clear();
    }
}