function writeLog($file, $msg, $mode='a+')	{		$fp = fopen($file, $mode);		if(flock($fp, LOCK_EX))		{			fwrite($fp, $msg);			fflush($fp);			flock($fp, LOCK_UN);		}		else			echo "Couldn't get the lock
";		fclose($fp);	}	$file = 'zzb.log';	writeLog($file, "1. this is the first message\n");	writeLog($file, "2. this is the first message\n");	writeLog($file, "3. this is the first message\n");	writeLog($file, "--------------------\n\n");