if (!isset($_POST['User_Type'])) {
                $errors[] = "User type is required";
            } else {
                $User_Type = $_POST['User_Type'];
            }
            if ($admin_controller->User_Name_Exists($User_Name)) {
                admin_redirect_error(Error_Type::SAME_USER_NAME);
            }
            if (empty($errors)) {
                /**
                 * instantiate a new user
                 */
                $new_user = new User($User_Name, $User_Password, $User_Type, $User_Phone);
                /**
                 * add the user to the database
                 */
                $added = $admin_controller->Add_User($new_user);
                /**
                 * inform the admin about the result
                 */
                if ($added) {
                    admin_redirect_success($new_user);
                } else {
                    admin_redirect_error(Error_Type::DATA_BASE);
                }
            } else {
                admin_redirect_error(Error_Type::FORM);
            }
        }
    }
}