foreach ($avail_types as $type => $count) {
            $is_selected = $t && strtolower($t) == strtolower($type);
            $filters[] = a('/@object/?i=' . $i . '&t=' . strtolower($type), '', 'fa fa-cog', $type . ' (' . $count . ')', $is_selected ? 'btn-warning' : 'btn-info', '');
        }