    public static function getId($id = '')
    {
        if (isset($id)) {
            $sql = sprintf("SELECT * FROM `menus` WHERE `id` = '%d'", $id);
            $menus = Db::result($sql);
            $n = Db::$num_rows;
        } else {
            $menus = '';
        }

        return $menus;
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.