如果在while里这么写，输出一次没问题，

while(1){
            $response = $client->scroll([
                    "scroll_id" => $scroll_id,
                    "scroll" => "30s",
                ]);
            var_dump($response);die;
            if (count($response['hits']['hits']) > 0) {
                $return = array_merge($response['hits']['hits'], $return);
                $scroll_id = $response["_scroll_id"];
            }else{
                // 没有数据了，扫描结束
                break;
            }
        }

但是如果去掉输出语句，请求就没响应了

实在是想不通，有遇到过类似的问题的朋友么