Habari\Session::add_to_set PHP Метод

    public static function add_to_set($set, $value, $key = null)
    {
        if (!isset($_SESSION[$set])) {
            $_SESSION[$set] = array();
        }
        if ($key) {
            $_SESSION[$set][$key] = $value;
        } else {
            $_SESSION[$set][] = $value;
        }
    }