Php为每个请求非阻塞地获取json api，而api服务器在5秒后返回？

I want to fetch JSON from a remote server API, but the data returns minimum after 5 seconds. While waiting for that, if I get another user request can PHP also send/ fetch the second request to remote server. (I don't want to wait until the first data fetching is done)

Note, that the remote server can handle multiple requests at a time. The only problem we are facing is that the process takes minimum 5 seconds.