/** * @param \callable $callback * @param array $args * @param mixed $cacheKeySuffix * @return string */ protected function getCallbackCacheKey($callback, $args = array(), $cacheKeySuffix = null) { $key = parent::getCallbackCacheKey($callback, $args, $cacheKeySuffix); if (strpos($key, ' ') !== false) { $key = md5($key); } return $key; }