public function wxlogin()
{
   
   $code = request()->input('code');
   $pid = request()->input('pid');
   if (!$code) {
       return $this->error('code为空');
   }
   //通过code获得 access_token + openid
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" . $this->appid
       . "&secret=" . $this->secret . "&code=" . $code . "&grant_type=authorization_code";
   $jsonResult = file_get_contents($url);
   $resultArray = json_decode($jsonResult, true);
   $access_token = $resultArray["access_token"];
   $openid = $resultArray["openid"];

   $num = Db::table('member')->where(array('openid' => $openid, 'status' => 1))->first();
   if ($num) {
       $token = JWT::encode($num->id, self::$tokenKey);
       $tag['token'] = $token;
       $tag['openid'] = '';
       return $this->success('登录成功', $tag);
   } else {
       $user_info_url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
       $user_info_response = file_get_contents($user_info_url);
       $user_info = json_decode($user_info_response, true);
       if ($user_info) {
           $tag['token'] = '';
           $tag['openid'] = $openid;
           $tag['nickname'] = $user_info['nickname'];
           $tag['headimgurl'] = $user_info['headimgurl'];
           return $this->success('登录成功', $tag);
       } else {
           return $this->error('网络异常,请重试');
       }

}

protected function curl($url, $data)
{
   $ch = curl_init();
   $params[CURLOPT_URL] = $url;    //请求url地址
   $params[CURLOPT_HEADER] = FALSE; //是否返回响应头信息
   $params[CURLOPT_SSL_VERIFYPEER] = false;
   $params[CURLOPT_SSL_VERIFYHOST] = false;
   $params[CURLOPT_RETURNTRANSFER] = true; //是否将结果返回
   $params[CURLOPT_POST] = true;
   $params[CURLOPT_POSTFIELDS] = $data;
   curl_setopt_array($ch, $params); //传入curl参数
   $content = curl_exec($ch); //执行
   curl_close($ch); //关闭连接
   return $content;
}