php写文件操作

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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");