Game-Jaming/Backend/Controllers/Registration/UpdateRegistration.php

<?php
require_once "../../../bootstrap.php";
require_once "../Group/Group.php";

use Backend\Models\Registration;

if(isLogin()){
    if(isset($_POST['updateReg'])){
        if($reg = Registration::find($_POST["registrationId"])->where("group_id", groupViaToken($_SESSION['token'])->id)->first()){
            $reg->group_amount = $_POST["groupAmount"];
            if($reg->save()){
                http_response_code(200);
            }else{
                http_response_code(500);
            }
        }else{
            http_response_code(400);
            echo json_encode(["message" => "registration does not exits"]);
        }

    }else{
        http_response_code(400);
    }
}else{
    http_response_code(401);
    echo json_encode(["message" => "is not login"]);
}