Auth::checkSessionConcurrency PHP Méthode

    public static function checkSessionConcurrency()
    {
        if (Session::userIsLoggedIn()) {
            if (Session::isConcurrentSessionExists()) {
                LoginModel::logout();
                Redirect::home();
                exit;
            }
        }
    }

 function __construct()
 {
     Session::init();
     Auth::checkSessionConcurrency();
     if (!Session::userIsLoggedIn() && Request::cookie('remember_me')) {
         Redirect::to("login/loginWithCookie");
     }
     $this->view = new View();
 }