PHP 记录日志

public function writelog($message)
        {
            $logFileDir = LOG_PATH;
            $logFile = 'monitor' . date('Y-m-d') . '.log';
            $log = date('Y-m-d H:i:s') . ' - ' . $message . "\n";
            $fp = fopen($logFileDir.$logFile, 'a+');
            fwrite($fp, $log);
            fclose($fp); 
        }