您可以使用 flock 和 LOCK_EX 获得文件的排他锁.

You can use flock with LOCK_EX to gain an exclusive lock on a file.

例如:

<?php
$fp = fopen('/tmp/php-commit.lock', 'r+');
if (!flock($fp, LOCK_EX | LOCK_NB)) {
    exit;
}

// ... do stuff

fclose($fp);
?>

PHP 5.3.2 以后的版本需要手动释放锁羊群($ fp，LOCK_UN)；

For PHP versions after 5.3.2 you need to manually release the lock using flock($fp, LOCK_UN);