yii\grid\Column::renderFooterCellContent PHP Method

The default implementation simply renders [[footer]]. This method may be overridden to customize the rendering of the footer cell.

protected renderFooterCellContent ( ) : string
return	string	the rendering result

    protected function renderFooterCellContent()
    {
        return trim($this->footer) !== '' ? $this->footer : $this->grid->emptyCell;
    }

Column