改进防止php脚本运行两次(使用cronjob)

<?php
$lockFile = '/tmp/my_script.lock';

if (file_exists($lockFile)) {
    exit('Script is already running.');
}

file_put_contents($lockFile, time());

// 执行任务
sleep(10); // 模拟任务执行时间

unlink($lockFile);
?>

<?php
$pdo = new PDO('mysql:host=localhost;dbname=mydb', 'username', 'password');

$lockQuery = "SELECT GET_LOCK('my_script_lock', 10)";
$unlockQuery = "SELECT RELEASE_LOCK('my_script_lock')";

if ($pdo->query($lockQuery)->fetchColumn() === 1) {
    try {
        // 执行任务
        sleep(10); // 模拟任务执行时间
    } finally {
        $pdo->query($unlockQuery);
    }
} else {
    exit('Script is already running.');
}
?>

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$lockKey = 'my_script_lock';
$lockTimeout = 10;

if ($redis->set($lockKey, time(), ['nx', 'ex' => $lockTimeout])) {
    try {
        // 执行任务
        sleep(10); // 模拟任务执行时间
    } finally {
        if ($redis->get($lockKey) == time()) {
            $redis->del($lockKey);
        }
    }
} else {
    exit('Script is already running.');
}
?>