Не работает сессия при авторизации,не могу понять почему ?*

<?php
namespace Modules;
class Session
{
    private $logged_in = false;
    public $user_id;
 
    //Session start and check logged in
    public function __construct()
    {
        session_start();
        $this->checkLogin();
        if ($this->logged_in) {
            // actions to take right away if user is logged in
        } else {
            // actions to take right away if user is not logged in
        }
    }
 
    //session destroy
    public function __destruct()
    {
        session_destroy();
    }
 
    // Check if User log in
    public function isLoggedIn()
    {
        return $this->logged_in;
    }//true
 
    //check if some one log in from page
    public function login($user)//true
    {
        // database should find user based on username/password
        if ($user) {
            $this->user_id = $_SESSION['user_id']=$user->id ;
            $this->logged_in = true;
        }
    }
 
    //unset out user_id
    public function logout()//true
    {
        unset($_SESSION['user_id']);
        unset($this->user_id);
        $this->logged_in = false;
    }
    // check for user_id accept
    private function checkLogin()
    {
        if (isset($_SESSION['user_id'])) {
            $this->user_id = $_SESSION['user_id'];
            $this->logged_in = true;
        } else {
            unset($this->user_id);
            $this->logged_in = false;
        }
    }//true
}

<?php
require_once ('../../vendor/autoload.php');
require_once ('../../includes/functions.php');
$session= new \Modules\Session();
$database= new \Modules\MySqlDatabase();
$object= new \Modules\User();
if($session->isLoggedIn()) {
    redirect_to("index.php");
}
 
// Remember to give your form's submit tag a name="submit" attribute!
if (isset($_POST['submit'])) { // Form has been submitted.
 
    $username = cleanStr($_POST['username']);
    $password = cleanStr($_POST['password']);
 
    // Check database to see if username/password exist.
    $found_user = $object->authenticate($username, $password);
 
    if ($found_user) {
        var_dump($session->login($found_user));
        redirect_to("index.php");
    } else {
        // username/password combo was not found in the database
        $message = "Username password are incorrect.";
    }
 
} else { // Form has not been submitted.
    $username = "";
    $password = "";
}

var_dump($session->login($found_user));

require_once ("../../vendor/autoload.php");
require_once ("../../includes/functions.php");
$session = new \Modules\Session();
var_dump($session->isLoggedIn());
if (!$session->isLoggedIn()) { redirect_to("login.php"); }
?>