weixin微信 判断 用户是否关注

<?php
       $access_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=XXXXXXXXXXXXXXXXXX&secret=XXXXXXXXXXXXXXXXXXXXXXXXXX";
       $access_msg = json_decode(file_get_contents($access_token));
       $token = $access_msg->access_token;
       $subscribe_msg = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=$token&openid=$_GET[openid]";
       $subscribe = json_decode(file_get_contents($subscribe_msg));
       $gzxx = $subscribe->subscribe;
       //
       if($gzxx === 1){
         echo "已关注";
       }else{
       echo "未关注";
       
	}
       
?>