php中redis锁怎么应用

class LockUtil
{
    private static $lock_prefix = 'hi_box_lock_';

    /**
     * @param $key
     * @param string $func 操作方法
     * @param int $timeout
     * @return bool true 未锁  false 已锁
     */
    public static function onLock($key,  $func='default', $timeout = 5): bool
    {
        if (empty($key) || $timeout <= 0) {
            return true;
        }
        /**
         * @var  $redis Redis
         */
        $redis = Cache::store('redis')->handler();
        $key = self::$lock_prefix.md5($func) . $key;
        // $key 如果存在 设置nx后 是不会重新覆盖set
        return $redis->set($key, 1, ['nx', 'ex' => $timeout]);
    }

    public static function unLock($key,$func='default')
    {
        /**
         * @var  $redis Redis
         */
        $redis = Cache::store('redis')->handler();
        $key = self::$lock_prefix .md5($func). $key;
        //监听Redis key防止【解锁事务执行过程中】被修改或删除，提交事务后会自动取消监控
        $redis->watch($key);
        if ($redis->get($key)) {
            $redis->multi()->del($key)->exec();
        }
        $redis->unwatch();
    }

}