获取token后

开始检测内容违规

$ztoken = $ok['access_token'];

$da = 'content":"特3456书yuuo莞6543李zxcz蒜7782法fgnv级完2347全dfji试3726测asad感3847知qwez到';

$content = curl_request('https://api.weixin.qq.com/wxa/msg_sec_check?access_token='.$ztoken.'&content='.$da,1);

    echo $content;

然后返回

{"errcode":44002,"errmsg":"empty post data hint: [7.6PiA03791511]"}

这是哪里的问题