public function render_results($results, $page, $totalcount, $url, $cat = null) {
        $content = '';

        if (\core_search\manager::is_search_area_categories_enabled() && !empty($cat)) {
            $toprow = [];
            foreach (\core_search\manager::get_search_area_categories() as $category) {
                $taburl = clone $url;
                $taburl->param('cat', $category->get_name());
                $taburl->param('page', 0);
                $taburl->remove_params(['page', 'areaids']);
                $toprow[$category->get_name()] = new \tabobject($category->get_name(), $taburl, $category->get_visiblename());
            }

            if (\core_search\manager::should_hide_all_results_category()) {
                unset($toprow[\core_search\manager::SEARCH_AREA_CATEGORY_ALL]);
            }

            $content .= $this->tabtree($toprow, $cat->get_name());
        }

        // Paging bar.
        $perpage = \core_search\manager::DISPLAY_RESULTS_PER_PAGE;
        $content .= $this->output->paging_bar($totalcount, $page, $perpage, $url);

        // Results.
        $resultshtml = array();
        foreach ($results as $hit) {
            $resultshtml[] = $this->render_result($hit);
        }
        $content .= \html_writer::tag('div', implode('<hr/>', $resultshtml), array('class' => 'search-results'));

        // Paging bar.
        $content .= $this->output->paging_bar($totalcount, $page, $perpage, $url);

        return $content;
    }