关于 php：guzzle6 中如何获取 Pool 请求的传输时间？

How to get transfer time for Pool requests in guzzle6?

我想获取每个请求的传输时间。
如何将 on_stats 选项用于异步请求？
http://docs.guzzlephp.org/en/latest/request-options.html#on-stats

我的代码：

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<?php
use GuzzleHttp\\{Pool, Client};
use GuzzleHttp\\Psr7\\{
Request, Response
};

$httpClient = new Client();
foreach ($items as $request) {
$requests[] = new Request(...);
}

$responses = Pool::batch($httpClient, $requests, ['fulfilled' => function($response, $index) {

});