switch ($data['period']) {
                case '7days':
                    switch ($data['vip']) {
                        case '1':
                            switch ($price) {
                                case ($price <= 1000):
                                    $mustPay = 15;
                                    break;
                                case ($price >= 1001 && $price <= 20000):
                                    $mustPay = 20;
                                    break;
                                case ($price > 20001):
                                    $mustPay = 30;
                                    break;
                            }
                            break;
                        case '0':
                            switch ($price) {
                                case ($price <= 1000):
                                    $mustPay = 5;
                                    break;
                                case ($price >= 1001 && $price <= 20000):
                                    $mustPay = 10;
                                    break;
                                case ($price > 20001):
                                    $mustPay = 20;
                                    break;
                            }
                            break;
                        default:
                            exit(json_encode(array('result' => 'fail', 'message' => 'Invalid value')));
                            break;
                    }
                    break;
                case '30days':
                    switch ($data['vip']) {
                        case '1':
                            switch ($price) {
                                case ($price <= 1000):
                                    $mustPay = 20;
                                    break;
                                case ($price >= 1001 && $price <= 20000):
                                    $mustPay = 30;
                                    break;
                                case ($price > 20001):
                                    $mustPay = 50;
                                    break;
                            }
                            break;
                        case '0':
                            switch ($price) {
                                case ($price <= 1000):
                                    $mustPay = 10;
                                    break;
                                case ($price >= 1001 && $price <= 20000):
                                    $mustPay = 20;
                                    break;
                                case ($price > 20001):
                                    $mustPay = 40;
                                    break;
                            }
                            break;
                        default:
                            exit(json_encode(array('result' => 'fail', 'message' => 'Invalid value')));
                            break;
                    }
                    break;
                default:
                    exit(json_encode(array('result' => 'fail', 'message' => 'Invalid period')));
                    break;
            }