public function checklogin()
    {
        $app = Slim::getInstance();
        $val = $app->request()->post();

        $pseudo = filter_var($val['identifiant'], FILTER_SANITIZE_STRING);
        $pass = filter_var($val['password'], FILTER_SANITIZE_STRING);

        $u = User::where("identifiant", "like", $pseudo)->first();
        $hash = $u->password;
          //$tmp=password_hash($pass, PASSWORD_DEFAULT );
        if (password_verify($pass, $hash)) {
            $_SESSION['id'] = $u->id;
        }
        $app->redirect($app->urlFor('homeadmin'));
    }