微信公众平台自定义菜单一直错误求助

JSON
{
    "button": [
        {
            "name": "线路查询",
            "type": "click",
            "key": "线路查询"
        },
        {
            "name": "热门推荐",
            "type": "click",
            "key": "热门推荐"
        },
        {
            "name": "服务网点",
            "sub_button": [
                {
                    "type": "click",
                    "name": "扬州直营店",
                    "key": "扬州直营店"
                },
                {
                    "type": "click",
                    "name": "江都直营店",
                    "key": "江都直营店"
                }
            ]
        }
    ]
}PHP代码$url='http://api.weixin.qq.com/cgi-bin/menu/create?access_token='.$json->access_token;
$ret=$this->api_notice_increment($url,$data);
$json=json_decode($ret);
dump($json->errcode);exit;function api_notice_increment($url, $data){
 $ch = curl_init();//初始化curl 
 $header = "Accept-Charset: utf-8";
 //$header = "Content-type: text/xml";//定义content-type为xml
 curl_setopt($ch, CURLOPT_URL, $url);//设置链接
 //curl_setopt($ch, CURLOPT_POST, 1);//设置为POST方式
 curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); 
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
 //curl_setopt($ch, CURLOPT_HTTPHEADER, $header);//设置HTTP头
 curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
 curl_setopt($ch, CURLOPT_AUTOREFERER, 1); 
 curl_setopt($ch, CURLOPT_POSTFIELDS, $data);//POST数据
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);//设置是否返回信息  $tmpInfo = curl_exec($ch);
 return $tmpInfo;
}以上代码总是返回45010，和上面测试成功的对比，应该没有问题。