example.php

<?php
// Guzzle behind an authenticated residential proxy.
// composer require guzzlehttp/guzzle
// QP_USER=... QP_PASS=... php example.php

require __DIR__ . '/vendor/autoload.php';

use GuzzleHttp\Client;

$user = (getenv('QP_USER') ?: 'YOUR_USERNAME');
$pass = (getenv('QP_PASS') ?: 'YOUR_PASSWORD');

$rotating = sprintf(
    'http://%s-country-us:%s@residentialboson.quantumproxies.io:9000',
    $user,
    $pass
);

$client = new Client(['proxy' => $rotating, 'timeout' => 30]);

// two calls through the rotating port -> two different exit IPs
foreach ([1, 2] as $i) {
    $info = json_decode((string) $client->get('https://ipinfo.io/json')->getBody(), true);
    printf("request %d: %s (%s, %s)\n", $i, $info['ip'], $info['country'] ?? '?', $info['city'] ?? '?');
}