curl asynchrone pool

<?php
use GuzzleHttp\Client;
use GuzzleHttp\Psr7\Request;
use GuzzleHttp\Psr7\Response;
use GuzzleHttp\Promise;

$client = new Client();

$promises = [
    'baidu' => $client->getAsync('http://www.baidu.com'),
    'google'  => $client->getAsync('http://www.google.com'),
];

$results = Promise\unwrap($promises);

$results['baidu']->getBody();
$results['google']->getBody();