Roots\StageSwitcher\StageSwitcher::multisite_url PHP Method

    private function multisite_url($url)
    {
        $stage_url = new Url($url);
        $current_site = new Url(get_home_url(get_current_blog_id()));
        $current_site->host = str_replace($current_site->registerableDomain, $stage_url->registerableDomain, $current_site->host);
        return rtrim($current_site->getUrl(), '/') . $_SERVER['REQUEST_URI'];
    }