public function authlogin(){ 

if($_GET){

            $appid = ''; //微信的appid

            $secret= ''; //微信的secret秘钥

            $code= $_GET['code'];//小程序传来的code值

            $url = "https://api.weixin.qq.com/sns/jscode2session?appid={$appid}&secret={$secret}&js_code={$code}&grant_type=authorization_code"; //请求接口获取openid

            $open = $this->http_curl($url);

            //yourAppid为开发者appid.appSecret为开发者的appsecret,都可以从微信公众平台获取

            $openid = $open['openid'];

            $sid = $_POST['sid'];//邀请人id

            $where['openid']=$openid;

            $list=M('user')->where($where)->find();

            if ($list !=null) { //如果数据库中存在此用户的信息，则不需要重新获取

                // $list['status']=1;

                 $arr=array('msg'=>'已经授权过了','code'=>'0','status'=>'1','list'=>$list,'openid'=>$openid);

                echo json_encode($arr,JSON_UNESCAPED_UNICODE);

            }else {

                $arr=array('msg'=>'还没有授权','code'=>'0','status'=>'0','list'=>$list,'openid'=>$openid);

                echo json_encode($arr,JSON_UNESCAPED_UNICODE);

            }

        }else{

            $arr=array('msg'=>'请求错误','code'=>'1');

            echo json_encode($arr,JSON_UNESCAPED_UNICODE);

        }

}

   public function http_curl($url){

        //用curl传参

        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);

        curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);

        //关闭ssl验证

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

        curl_setopt($ch,CURLOPT_HEADER, 0);

        $output = curl_exec($ch);

        curl_close($ch);

        return json_decode($output, true);

    }