/**
  * Immediately invalidates all keys in the cache store
  *
  * Whether or not the cache store's memory or resource allocation is freed
  * is determined by the implementation
  *
  * @return boolean True on success, false on failure
  */
 public function expireAll()
 {
     if (!$this->enabled) {
         return true;
     }
     $this->Logger->debug('Expire all keys');
     $ns = ini_get('eaccelerator.name_space');
     foreach (eaccelerator_list_keys() as $key => $value) {
         eaccelerator_rm(StringUtils::strRight($value['name'], $ns . ':'));
     }
 }