code: public function renderDataCell($model, $key, $index)
      {
          if ($this->contentOptions instanceof Closure) {
              $options = call_user_func($this->contentOptions, $model, $key, $index, $this);
          } else {
              $options = $this->contentOptions;
          }
  
          return Html::tag('td', $this->renderDataCellContent($model, $key, $index), $options);
      }
docs: Renders a data cell.
  @param mixed $model the data model being rendered
  @param mixed $key the key associated with the data model
  @param int $index the zero-based index of the data item among the item array returned by [[GridView::dataProvider]].
  @return string the rendering result