$img=$_POST['image'];
            $newname=time().rand(10000,9999999);
            $new_file="./imgs/".$newname.".png";
            file_put_contents($new_file, base64_decode($img));
            $tk=$this->token55(); //获取token
            $url= "https://api.weixin.qq.com/wxa/media_check_async?access_token=".$tk;
            $openid=I('openid');//post过来的openid
            $imgurl="https://我的域名/imgs/".$newname.".png";
            $arr=array(
             "version"=>2,
             "openid"=>"$openid",
             "media_type"=>2,
             "scene"=>2,
             "media_url"=>$imgurl,
             );
             $d=json_encode($arr,JSON_UNESCAPED_UNICODE);
             var_dump($d);
             $res=$this->httpRequest($url,$d);
             $res=json_decode($res,true);

返回值 $res：
array(3) {
  ["errcode"] => int(0)
  ["errmsg"] => string(2) "ok"

["trace_id"] => string(26) "63774cde-072da914-29b3d2be"}

怎么无论什么图片都是这样返回，没有result