使用PHP和XML来实现定时任务和计划

<tasks>
    <task>
        <name>任务1</name>
        <time>2022-01-01 00:00:00</time>
        <frequency>每天</frequency>
        <script>script1.php</script>
    </task>
    <task>
        <name>任务2</name>
        <time>2022-02-02 12:00:00</time>
        <frequency>每周</frequency>
        <script>script2.php</script>
    </task>
    <task>
        <name>任务3</name>
        <time>2022-03-03 06:00:00</time>
        <frequency>每月</frequency>
        <script>script3.php</script>
    </task>
</tasks>

<?php
// 读取XML文件
$xml = simplexml_load_file('tasks.xml');

// 遍历所有任务
foreach ($xml->task as $task) {
    $name = (string) $task->name;
    $time = strtotime((string) $task->time);
    $frequency = (string) $task->frequency;
    $script = (string) $task->script;

    // 检查任务是否需要执行
    if ($time <= time()) {
        // 执行相应的脚本
        exec("php $script");

        // 根据任务的频率更新下次执行时间
        if ($frequency == '每天') {
            $time = strtotime('+1 day', $time);
        } elseif ($frequency == '每周') {
            $time = strtotime('+1 week', $time);
        } elseif ($frequency == '每月') {
            $time = strtotime('+1 month', $time);
        }

        // 更新XML文件中的执行时间
        $task->time = date('Y-m-d H:i:s', $time);
    }
}

// 保存更新后的XML文件
$xml->asXML('tasks.xml');