通过 Composer 安装 composer require zoujingli/ip2region 
    public function index()
    {
        $ip2region = new \Ip2Region();
        /**
         * $info = [
         *        "city_id": 0,
         *        "region": "国家|方位|省/直辖市|市|运营商"
         *  ];
         */
        $info = $ip2region->btreeSearch("ip");
    }