Game-Jaming/Backend/Controllers/Admin/Admin.php

<?php
/**
 * @return bool
 */
function isAdmin(): bool
{
    session_start();
    return isset($_SESSION['admin']);
}

/**
 * @param string $userName
 */
function makeAdminLogin(string $userName)
{
    setcookie("userName", $userName, [
        'expires' => 0,
        'samesite' => 'Strict',
        'path' => '/'
    ]);
}