召唤PHP神坛的大神,急急如律令

大神们帮看下,微信高级群发,在上传图文消息时,总是返回图44003图文消息为空
看下这个代码哪出错了,缩略图的ID是已经获取到了的.
//上传图文,获取图文消息ID
$news=array('thumb_media_id'=>$thumb_media_id,
               'author'=>'PHP小菜鸟',
               'title'=>'测试上传图文',
               'content_source_url'=>'',
                'content'=>'34334',
               'digest'=>'');$twurl="https://api.weixin.qq.com/cgi-bin/media/uploadnews?access_token=".$access_token;
$turl = curl_init();
    curl_setopt($turl, CURLOPT_URL, $twurl);
    curl_setopt($turl, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($turl, CURLOPT_SSL_VERIFYHOST, FALSE);
    if (!empty($news)){
        curl_setopt($turl, CURLOPT_POST, 1);
        curl_setopt($turl, CURLOPT_POSTFIELDS, $news);
    }
    curl_setopt($turl, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($turl);
    curl_close($turl);
echo $output;