Gaoming13\WechatPhpSdk\Api::get_materials PHP Method

    public function get_materials($type, $offset, $count)
    {
        $url = self::API_DOMAIN . 'cgi-bin/material/batchget_material?access_token=' . $this->get_access_token();
        $xml = sprintf('{"type":"%s","offset":"%s","count":"%s"}', $type, $offset, $count);
        $res = HttpCurl::post($url, $xml, 'json');
        // 异常处理: 获取时网络错误
        if ($res === false) {
            return Error::code('ERR_GET');
        }
        // 判断是否调用成功
        if ($res->errcode == 0) {
            return array(null, $res);
        } else {
            return array($res, null);
        }
    }