PHP微信PC二维码登陆的实现思路

if ($user = model('Member')->field('id')->where(array('third_id' => $openid))->find()) {
         $data=array(
           'id'=>$id,
           'uid'=> $user['id']
         );
         model('LoginQrcode')->isUpdate()->save($data);
         return array('登陆成功', 'text');
       }

* 微信登录异步请求
   * @return \think\response\Json
   * created by sunnier<xiaoyao_xiao@126.com>
   */
  public function ajaxWechatLogin(){
      for ($i = 0; $i < 6; $i++) {
        $database_login_qrcode = model('LoginQrcode');
        $condition_login_qrcode['id'] = input('get.qrcode_id');
        if(empty($condition_login_qrcode['id'])){
          return $this->returnJson('未获取到qrcode_id！',0);
        }
        $now_qrcode = $database_login_qrcode->field('`uid`')->where($condition_login_qrcode)->find();
        if (!empty($now_qrcode['uid'])) {
          if ($now_qrcode['uid'] == -1) {
            $data_login_qrcode['uid'] = 0;
            $database_login_qrcode->where($condition_login_qrcode)->isUpdate(true)->save($data_login_qrcode);
            return $this->returnJson('请在微信公众号点击授权登录！',0);
          }
          $database_login_qrcode->where($condition_login_qrcode)->delete();
          $result = model('Member')->autologin('id', $now_qrcode['uid']);
          if (empty($result['error_code'])) {
            return $this->returnJson('登录成功！',1,$result['user']);
          } else if ($result['error_code'] == 1001) {
            return $this->returnJson('没有查找到用户，请重新扫描二维码！',0);
          } else if ($result['error_code']) {
            return $this->returnJson('登陆失败！',0);
          }
        }
        if ($i == 5) {
          return $this->returnJson('登陆失败',0);
        }
        sleep(3);
      }
  }