ElapsedTimeAtExit

<?php

require_once(realpath(__DIR__).'/../vendor/autoload.php');

$reactor = Amp\reactor();
$client = new \Amp\Artax\Client($reactor);
$client->setOption(\Amp\Artax\Client::OP_MS_KEEP_ALIVE_TIMEOUT, 3000);

$callbackTime = null;
$callback = function () use (&$callbackTime) {
    echo "I r callback!!\n";
    $callbackTime = microtime(true);
};

$promise = $client->request("http://www.bing.com/asdasdasdsd");
$promise->when($callback);

echo "Running reactor: \n";
$reactor->run();

$elapsed = microtime(true) - $callbackTime;
printf("elapsed: %5.2f\n", $elapsed);

echo "Fin.";