    public static function insert($vars){
        if(is_array($vars)){
            $sql = array(
                        'table' => 'menus',
                        'key' => $vars
                    );
            $menu = Db::insert($sql);
        }
    }

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.