$url = admin_url('admin.php', 'relative');
            }
        } else {
            if (is_multisite()) {
                $url = network_admin_url('admin.php');
            } else {
                $url = admin_url('admin.php');
            }
        }
        return $url . '?' . http_build_query($data);
    }

    /**
     * Return menu pages list
     *
     * @return AbstractMenuPageController[]
     */
    public static function getMenuPages()
    {
        static $basicMenuPages = null;

        if (is_null($basicMenuPages)) {
            $basicMenuPages   = array();
            $basicMenuPages[] = MainPageController::getInstance();
            $basicMenuPages[] = PackagesPageController::getInstance();
            $basicMenuPages[] = ImportPageController::getInstance();
            $basicMenuPages[] = ImportInstallerPageController::getInstance();
            $basicMenuPages[] = EmailSummaryPreviewPageController::getInstance();
            $basicMenuPages[] = HelpPageController::getInstance();
            $basicMenuPages[] = StoragePageController::getInstance();
            $basicMenuPages[] = SettingsPageController::getInstance();
            $basicMenuPages[] = DebugPageController::getInstance();
            $basicMenuPages[] = ToolsPageController::getInstance();
        }

        return array_filter(
            apply_filters(
                'duplicator_menu_pages',
                $basicMenuPages
            ),
            function ($menuPage) {
                return is_subclass_of($menuPage, '\Duplicator\Core\Controllers\AbstractSinglePageController');
            }
        );
    }

    /**
     * Return menu pages list sorted by position
     *
     * @return AbstractMenuPageController[]
     */
    protected static function getMenuPagesSortedByPos()
    {
        $menuPages = self::getMenuPages();

        uksort($menuPages, function ($a, $b) use ($menuPages) {
            if ($menuPages[$a]->getPosition() == $menuPages[$b]->getPosition()) {
                if ($a == $b) {
                    return 0;
                } elseif ($a > $b) {
                    return 1;
                } else {
                    return -1;
                }
            } elseif ($menuPages[$a]->getPosition() > $menuPages[$b]->getPosition()) {
                return 1;
            } else {
                return -1;
            }
        });
        return array_values($menuPages);
    }

    /**
     * Return page controlle by slug of false if don't exist
     *
     * @param string $slug page key
     *
     * @return boolean|AbstractMenuPageController
     */
    public static function getPageControlleBySlug($slug)
    {
        $menuPages = self::getMenuPages();
        foreach ($menuPages as $page) {
            if ($page->getSlug() === $slug) {
                return $page;
            }
        }

        return false;
    }

    /**
     * Register menu pages
     *
     * @return void
     */
    public function registerMenu()
    {
        $menuPages = self::getMenuPagesSortedByPos();

        // before register main pages
        foreach ($menuPages as $menuPage) {
            if (!$menuPage->isEnabled() || !$menuPage->isMainPage()) {
                continue;
            }

            $menuPage->registerMenu();
        }

        // after register secondary pages
        foreach ($menuPages as $menuPage) {
            if (!$menuPage->isEnabled() || $menuPage->isMainPage()) {
                continue;
            }

            $menuPage->registerMenu();
        }
    }
}