找到以多卷曲发送每个请求的时间

I use multi curl to sending requests and want to know, when exactly each request sending. I have simple function from manual like this :

function multirequest($urls) //may be $urls contains 10 urls, or may be 1 000
{
    $multi = curl_multi_init();
    $handles = []; 
    $htmls = [];
for($i=0; $i<count($urls);$i++)
{       
    $ch = curl_init('https://....');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_multi_add_handle($multi, $ch);
    array_push($handles, $ch); 
} 

do {  
    $mrc = curl_multi_exec($multi, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) 
{
    if (curl_multi_select($multi) == -1) 
    {
        usleep(1);
    }
    do
    {
        $mrc = curl_multi_exec($multi, $active);
    }while($mrc == CURLM_CALL_MULTI_PERFORM);
}

foreach($handles as $channel)
{
    $html = curl_multi_getcontent($channel);
    $htmls[] = $html;
    curl_multi_remove_handle($multi, $channel);
}
curl_multi_close($multi);
return $htmls;
}

I think, everyone used this code. I know, that it's possible to use callback to find response time via microtime() function. But I don't understand how to find the moment, when request start send ? Is that possible to set sequence of requests in multi curl ? Could someone help ? Thank you.

UPD

Is that possible to set sequence of requests in multi curl ? I am not sure,that first $ch in array will be really send first.