protected function _logtofile($data)
{
if (!empty(self::$settings->logfilePath) && file_exists(self::$settings->logfilePath . "/")) {
file_put_contents(self::$settings->logfilePath . "/" . date("Y-m-d") . ".log", date("Y-m-d H:i:s") . ' ' . (is_array($data) ? print_r($data) : trim($data)) . "\n", FILE_APPEND);
}
}