/**
* Gets cached data
*
* @param string $key key name
* @param string $cache_level indicates the cache dependencies on controller, language, user group, etc
*
* @return mixed cached data if exist, NULL otherwise
*/
private static function _getCache($key, $cache_level = NULL)
{
$time_start = microtime(true);
$data = self::$_cache->get($key, $cache_level);
Debugger::set_cache_query($key . '::' . $cache_level, microtime(true) - $time_start);
return $data !== false && !empty($data[0]) ? $data[0] : NULL;
}
