WHMCS - get user data from the url

get_user.php

<?php

// include whmcs
require_once $_SERVER['DOCUMENT_ROOT'].'/init.php';

/**
 * WHMCS Sample Local API Call
 *
 * @package    WHMCS
 * @author     WHMCS Limited <development@whmcs.com>
 * @copyright  Copyright (c) WHMCS Limited 2005-2016
 * @license    http://www.whmcs.com/license/ WHMCS Eula
 * @version    $Id$
 * @link       http://www.whmcs.com/
 */

// get url and parse client ID string from the url
$url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

parse_str(parse_url($url)['query'], $params);

$command = 'GetClientsDetails';
$postData = array(
    'clientid' => $params['clientid'],
    'stats' => true,
);

$results = localAPI($command, $postData);

print '<pre>';
print_r($results);
print '</pre>';

?>