public function batchGet(array $openIds, $lang = 'zh_CN')
    {
        $params = [];

        $params['user_list'] = array_map(function ($openId) use ($lang) {
            return [
                    'openid' => $openId,
                    'lang' => $lang,
                    ];
        }, $openIds);

        return $this->parseJSON('json', [self::API_BATCH_GET, $params]);
    }