private static function allowAvailRoom()    {        session_start();        $now = time();        $minute_interval = 5;        $max_cnt = 20;        if (isset($_SESSION['request_time'])) {            $request_time = $_SESSION['request_time'];            if ($now - $request_time < $minute_interval * 60) {                if (isset($_SESSION['request_cnt'])) {                    $request_cnt = $_SESSION['request_cnt'];                    if ($request_cnt >= $max_cnt) {                        return false;                    } else {                        $_SESSION['request_cnt'] += 1;                        return true;                    }                }            }        }        $_SESSION['request_time'] = $now;        $_SESSION['request_cnt'] = 1;        return true;    }

5分钟最多提交20次