App\Controller\Db::tables PHP Method

    function tables()
    {
        /**
         * master database
         */
        $tables = $this->db->query("show tables")->fetchall();
        var_dump($tables);
        /**
         * other
         */
        $tables = $this->db("huya")->query("show tables")->fetchall();
        var_dump($tables);
    }