php写文件操作

	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<br/>";

		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");