Prestashop: CMS category in URL

public function getCMSLink($cms, $alias = null, $ssl = null, $id_lang = null, $id_shop = null, $relative_protocol = false){
		
        if (!$id_lang) {
            $id_lang = Context::getContext()->language->id;
        }

        $url = $this->getBaseLink($id_shop, $ssl, $relative_protocol).$this->getLangLink($id_lang, null, $id_shop);

        $dispatcher = Dispatcher::getInstance();
       
        if (!is_object($cms)) {
            if ($alias !== null && !$dispatcher->hasKeyword('cms_rule', $id_lang, 'meta_keywords', $id_shop) && !$dispatcher->hasKeyword('cms_rule', $id_lang, 'meta_title', $id_shop)) {
                return $url.$dispatcher->createUrl('cms_rule', $id_lang, array('id' => (int)$cms, 'rewrite' => (string)$alias), $this->allow, '', $id_shop);
            }
            $cms = new CMS($cms, $id_lang);

        }

        // Set available keywords
        $params = array();
        $params['id'] = $cms->id;
        $params['rewrite'] = (!$alias) ? (is_array($cms->link_rewrite) ? $cms->link_rewrite[(int)$id_lang] : $cms->link_rewrite) : $alias;
        $category = new CMSCategory($cms->id_cms_category);
        //Custom code to insert $category into SEO & URL section.
        $params['category'] = (!is_null($category->name[1]) && !empty($category->name[1])) ? Tools::str2url($category->name[1]) : "";
        $params['meta_keywords'] = '';
        //end of custom code
        if (isset($cms->meta_keywords) && !empty($cms->meta_keywords)) {
            $params['meta_keywords'] = is_array($cms->meta_keywords) ?  Tools::str2url($cms->meta_keywords[(int)$id_lang]) :  Tools::str2url($cms->meta_keywords);
        }

        $params['meta_title'] = '';
        if (isset($cms->meta_title) && !empty($cms->meta_title)) {
            $params['meta_title'] = is_array($cms->meta_title) ? Tools::str2url($cms->meta_title[(int)$id_lang]) : Tools::str2url($cms->meta_title);
        }

        return $url.$dispatcher->createUrl('cms_rule', $id_lang, $params, $this->allow, '', $id_shop);
    }