微信开发之网页授权(获取access_token和code)

1.我们首先在公众测试号那配置授权回调域名(注意不加http和Https):

2.获取code

   在控制器写入以下代码：

public function index(){
      $appid="wx4ff531ee8a470861";
      $rediret_url=urlencode('http://wyzdjg.top/vote/index.php/home/index/getcode');
      // $rediret_url=urlencode('http://www.baidu.com');
      $url="https://open.weixin.qq.com/connect/oauth2/authorize?appid=$appid&redirect_uri=$rediret_url&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect";
      header("location:".$url);
    }

public function getcode(){
      $code=$_GET['code'];
        $json=$this->access_token($co