parallel with Guzzle

gistfile1.php

$url = '/wsapi/2.0/verify?'.http_build_query($params).'&h='.$signature;

        // Make the connections in a pool
        $pool = array();
        $client = new \Guzzle\Http\Client();

        foreach ($this->hosts as $host) {
            $pool[] = $client->get('http://'.$host.$url);
        }
        $responses = $client->send($pool, array(
            'complete' => function (\Guzzle\Http\Event\CompleteEvent $event) {
                echo 'resp object: '.var_export($event->getResponse(), true)."\n";

                $response = $event->getResponse()->getBody();
                echo 'RESPONSE: '.$response."\n";
            },
            'error' => function(\Guzzle\Http\Event\ErrorEvent $event) {
                echo 'Request failed: ' . $event->getRequest()->getUrl() . "\n";
                echo $event->getException();
            }
        ));