Request.php

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<?php
namespace Elgg\Http;

use Symfony\Component\HttpFoundation\Request as SymfonyRequest;
use Elgg\Application;

class Request extends SymfonyRequest {

    public function getUrlSegments($raw = false) {
        $path = trim($this->query->get(Application::GET_PATH_KEY), '/');
        if (!$raw) {
            $path = htmlspecialchars($path, ENT_QUOTES, 'UTF-8');
        }
        if (!$path) {
            return array();
        }

        return explode('/', $path);
    }

    public function setUrlSegments(array $segments) {
        $query = $this->query->all();
        $query[Application::GET_PATH_KEY] = '/' . implode('/', $segments);
        return $this->duplicate($query);
    }

    public function getFirstUrlSegment() {
        $segments = $this->getUrlSegments();
        if ($segments) {
            return array_shift($segments);
        } else {
            return '';
        }
    }

    public function getClientIp() {
        $ip = parent::getClientIp();

        if ($ip == $this->server->get('REMOTE_ADDR')) {
            // try one more
            $ip_addresses = $this->server->get('HTTP_X_REAL_IP');
            if ($ip_addresses) {
                $ip_addresses = explode(',', $ip_addresses);
                return array_pop($ip_addresses);
            }
        }

        return $ip;
    }

    public function isXmlHttpRequest() {
        return (strtolower($this->headers->get('X-Requested-With')) === 'xmlhttprequest'
            || $this->query->get('X-Requested-With') === 'XMLHttpRequest'
            || $this->request->get('X-Requested-With') === 'XMLHttpRequest');
        // GET/POST check is necessary for jQuery.form and other iframe-based "ajax". #8735
    }

    protected function stripSlashesIfMagicQuotes($data) {
        if (get_magic_quotes_gpc()) {
            return _elgg_stripslashes_deep($data);
        } else {
            return $data;
        }
    }
}