PHP之微信服务号如何获取openid

    public function tetst(){
      if(!isset($_GET[&＃39;code&＃39;])){
              $APPID = $this->app_id;
              $ran = rand(1,100); //预防缓存
              $REDIRECT_URI = &＃39;http://www.onedayoneclass.com/Home/Index/tetst?number=&＃39;.$ran.&＃39;&＃39;; //一定写上http://
              $scope=&＃39;snsapi_userinfo&＃39;;
              $url=&＃39;https://open.weixin.qq.com/connect/oauth2/authorize?appid=&＃39;.$APPID.&＃39;&redirect_uri=&＃39;.urlencode($REDIRECT_URI).&＃39;&response_type=code&scope=&＃39;.$scope.&＃39;&state=wx&＃39;.&＃39;#wechat_redirect&＃39;;
              //加缓存 随机数
              header("Location:".$url);
          }else{
            $appid = $this->app_id;
            $secret = $this->app_secret;
             $code = $_GET["code"];
             $get_token_url = &＃39;https://api.weixin.qq.com/sns/oauth2/access_token?appid=&＃39;.$appid.&＃39;&secret=&＃39;.$secret.&＃39;&code=&＃39;.$code.&＃39;&grant_type=authorization_code&＃39;;
             $ch = curl_init();
             curl_setopt($ch,CURLOPT_URL,$get_token_url);
             curl_setopt($ch,CURLOPT_HEADER,0);
             curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
             curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
             $res = curl_exec($ch);
             curl_close($ch);
             $json_obj = json_decode($res,true);
             //根据openid和access_token查询用户信息
             $access_token = $json_obj[&＃39;access_token&＃39;];
             $openid = $json_obj[&＃39;openid&＃39;];
             $get_user_info_url = &＃39;https://api.weixin.qq.com/sns/userinfo?access_token=&＃39;.$access_token.&＃39;&openid=&＃39;.$openid.&＃39;&lang=zh_CN&＃39;;
             
             $ch = curl_init();
             curl_setopt($ch,CURLOPT_URL,$get_user_info_url);
             curl_setopt($ch,CURLOPT_HEADER,0);
             curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
             curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
             $res = curl_exec($ch);
             curl_close($ch);
             
             //解析json
             $user_obj = json_decode($res,true);
             $_SESSION[&＃39;user&＃39;] = $user_obj;
             print_r($user_obj);
         }
    }

结果：

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