php使用flock堵塞写入文件和非堵塞写入文件

php使用flock堵塞写入文件和非堵塞写入文件

堵塞写入代码：（全部程序会等待上次程序运行结束才会运行，30秒会超时）

<?php

$file = fopen("test.txt","w+");

$t1 = microtime(TRUE);

if (flock($file,LOCK_EX))

{

  sleep(10);

  fwrite($file,"Write something");

  flock($file,LOCK_UN);

  echo "Ok locking file!";

}

else

{

  echo "Error locking file!";

}

fclose($file);

$t2 = microtime(TRUE);

echo sprintf("%.6f",($t2-$t1));

非堵塞写入代码：（仅仅要文件被占用，则显示Error locking file!）

<?

php

$file = fopen("test.txt","a+");

$t1 = microtime(TRUE);

if (flock($file,LOCK_EX|LOCK_NB))

{

  sleep(10);

  fwrite($file,"Write something");

  flock($file,LOCK_UN);

  echo "Ok locking file!";

}

else

{

  echo "Error locking file!";

}

fclose($file);

$t2 = microtime(TRUE);

echo sprintf("%.6f",($t2-$t1));