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($code);
        // echo $json;
        $arr=json_decode($json,true);
        $arr=array_change_key_case($arr,CASE_LOWER);
        if(isset($arr['access_token'])&& isset($arr['openid'])){
            $this->userinfo($arr['access_token'],$arr['openid']);
        }else{
            echo "获取access_token出错".$json;
        }
    }

3.获取网页授权的access_toekn:

public function access_token($code){
    	$appid="wx4ff531ee8a470861";
    	$secret="2ec9b2f1a1f67b8743d23f9fc70c1c97";
        $url="https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
        $ret=https_request($url);
    	return $ret;
    }