BUG: locks not working as expected

Description

The following code:

<?php
$arquivo_lock = fopen("test.txt","a");

if (flock($arquivo_lock,LOCK_EX|LOCK_NB)) { 
    echo "Yes";
} else {
    echo "No";
}

sleep(10);

fclose($arquivo_lock);
?>

Save the simple code above to the file test.php, for example. Now, in less than 10 seconds apart, open 2 (or more) tabs on your browser calling the file test.php and you will see every tab will show you Yes after some seconds. It should show Yes only on the first tab, all the other should return immediatly with No because I am using LOCK_NB flag.

This bug is pretty simple to reproduce and other people also confirmed it on Stackoverflow when I reported there.

PHP Version

8.x

Operating System

Confirmed at least on centos 9 stream and windows 11

首先在报告的 CentOS 9 Stream 和 Windows 11 环境中使用 PHP 8.x 运行 test.php 的双标签页复现，重点关注带有 LOCK_EX|LOCK_NB 的 flock。跟踪 flock 的入口点和平台特定的锁定行为；完成标准是第一个请求报告 Yes，而重叠请求立即返回 No，并覆盖已确认的环境。