PHP 从数组对象中取出数组提示：Undefined property: stdClass::$subject

是由于PHP增加严谨性，首先要加下判断数组值是否存在，然后在获取！
     if (isset($result->access_token)) {

     }

 $curl = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$this->app_id.'&secret='.$this->app_secret.'&code='.$code.'&grant_type=authorization_code';$content = $this->_request($curl);$result = json_decode($content);//先判断是否有值，然后通过access_token和openid拉取用户信息if (isset($result->access_token)) {$webAccess_token = $result->access_token;$openid = $result->openid;}