framework/grid/GridView.php
public function renderTableFooter()
    {
        $cells = [];
        foreach ($this->columns as $column) {
            /* @var $column Column */
            $cells[] = $column->renderFooterCell();
        }
        $content = Html::tag('tr', implode('', $cells), $this->footerRowOptions);
        if ($this->filterPosition === self::FILTER_POS_FOOTER) {
            $content .= $this->renderFilters();
        }

        return "<tfoot>\n" . $content . "\n</tfoot>";
    }
public function renderTableFooter()
    {
        $cells = [];
        foreach ($this->columns as $column) {
            /* @var $column Column */
            $cells[] = $column->renderFooterCell();
        }
        $content = Html::tag('tr', implode('', $cells), $this->footerRowOptions);
        if ($this->filterPosition === self::FILTER_POS_FOOTER) {
            $content .= $this->renderFilters();
        }

        return "<tfoot>\n" . $content . "\n</tfoot>";
    }
Renders the table footer.
@return string the rendering result.