PbootCMS模板自动清理runtime缓存

### PbootCMS模板自动清理runtime缓存
### <script src='/?p=/ExtLabel/clean_session/' async='async'></script>
```markdown
1. 打开 `/apps/home/controller/ExtLabelController.php` 文件
2. 找到 `// 测试扩展单个标签` 方法
3. 在其下方添加自动会话清理脚本：
```php
public function clean_session()
{
    check_dir(RUN_PATH . '/archive', true);
    $data = json_decode(trim(substr(file_get_contents(RUN_PATH . '/archive/session_ticket.php'), 15)));
    if ($data->expire_time && $data->expire_time < time()) {
        ignore_user_abort(true);
        set_time_limit(7200);
        ob_start();
        ob_end_flush();
        flush();
        $rs = path_delete(RUN_PATH . '/session');
        if ($rs) {
            $data->expire_time = time() + 60 * 60 * 24; // 下一次清理时间
            create_file(RUN_PATH . '/archive/session_ticket.php', "<?php exit();?>" . json_encode($data), true);
        }
    } else {
        $data->expire_time = time() - 60 * 60 * 24; // 初始化清理时间
        create_file(RUN_PATH . '/archive/session_ticket.php', "<?php exit();?>" . json_encode($data), true);
    }
}