Concurrent requests using pecl_http

http_pool.php

<?php

$endpoint = "http://api.someservice.com";
$userId = 101;

$urls = array(
    $endpoint . '/profile/' . $userId,
    $endpoint . '/orderHistory/' . $userId,
    $endpoint . '/currentBalance/' . $userId
);

$pool = new HttpRequestPool;

foreach ($urls as $url) {
    $req = new HttpRequest($url, HTTP_METH_GET);
    $pool->attach($req);
}

// send all the requests. control is back to the script once 
// all the requests are complete or timed out
$pool->send();

foreach ($pool as $request) {
    echo $request->getUrl(), PHP_EOL;
    echo $request->getResponseBody(), PHP_EOL . PHP_EOL;
}