php 调用微信上传临时素材接口 {“errcode”:41005,”errmsg”:”media data missing hint”}

 //上传临时素材
        $url="https://api.weixin.qq.com/cgi-bin/media/upload?access_token=".$token."&type=".$type;
        //2、同步到微信服务器
        if(class_exists('CURLFile')){  //7.0
            $data = ['media' => new CURLFile($picPath)];
        }else{  //5.6以及5.6以下
            $data = array('media' => '@'.$picPath);
        }

        $ch  = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER , true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER , false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST , false);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        $res  = curl_exec($ch);
        curl_close($ch);
        $wxrs_id_card=json_decode($res,true);
        $id_card =$wxrs_id_card['media_id'];  //得到media_id

if(class_exists('CURLFile')){
    $data = ['media' => new CURLFile($media)];
}else{
    $data = ['media' => "@{$media}"];
}

$data = ['form-data' => $data];