HTTP Get time for response - php

Question

I'm playing around with guzzle and trying to build a simple page, that i can add my domains to - and have it check if they are currently online/accessible.
I can currently check if an array/list of domain's is online, or if it gets rejected for some reason. I would love to also be able to see in my log/DB how long it takes from i send a the HTTP request to [mydomain.com] until the response arrives back.
Current Code:
use GuzzleHttp\Client;
use GuzzleHttp\Exception\RequestException;
use GuzzleHttp\Pool;
use GuzzleHttp\Psr7\Request;
use GuzzleHttp\Psr7\Response;
if(!empty($aDomains))
{
$oClient = new Client(['expect' => false]);
$aAcceptedResponse = [];
$aRejectedResponses = [];
$aCreatedRequests = [];
foreach ($aDomains as $iDomainKey => $sDomain)
{
array_push($aCreatedRequests, new Request('GET', $sDomain));
}
$pool = new Pool($oClient, $aCreatedRequests,
[
'concurrency' => 50,
'options' => ['timeout' => 10],
'fulfilled' => function ($response, $index) use (&$aAcceptedResponse)
{
$aAcceptedResponse[] = $index;
},
'rejected' => function ($reason, $index) use(&$aRejectedResponses)
{
$aRejectedResponses[] = $index;
},
]);
$promise = $pool->promise();
$promise->wait();
}
I figured i would be able to find something in the guzzle response object, but so far i have been unable to find anything - am i blind or is it not possible to see this?

Answer 1

Thanks to El_Vanja's answer i figured it out by just using a global timestamp:
$iStartExecutionTime = microtime(true);
$oClient = new Client(['expect' => false]);
$aAcceptedResponse = [];
$aRejectedResponses = [];
$aCreatedRequests = [];
foreach ($aDomains as $iDomainKey => $oDomain)
{
array_push($aCreatedRequests, new Request('GET', $oDomain->sDomainName));
update_domain_uptime_monitor($oDomain->iID, 1, date('Y-m-d H:i:s', strtotime('NOW')+$oDomain->iInterval), date('Y-m-d H:i:s', strtotime('NOW')));
}
$pool = new Pool($oClient, $aCreatedRequests,
[
'concurrency' => 50,
'options' => ['timeout' => 10],
'fulfilled' => function ($response, $index) use (&$aAcceptedResponse)
{
$aAcceptedResponse[$index] = (microtime(true)-$GLOBALS['iStartExecutionTime']);
},
'rejected' => function ($reason, $index) use(&$aRejectedResponses)
{
$aRejectedResponses[] = $index;
},
]);
$promise = $pool->promise();
$promise->wait();