yii\grid\DataColumn::renderDataCellContent PHP Method

    protected function renderDataCellContent($model, $key, $index)
    {
        if ($this->content === null) {
            return $this->grid->formatter->format($this->getDataCellValue($model, $key, $index), $this->format);
        } else {
            return parent::renderDataCellContent($model, $key, $index);
        }
    }

 protected function renderDataCellContent($model, $key, $index)
 {
     $text = parent::renderDataCellContent($model, $key, $index);
     if (in_array($this->format, ['text', 'date', 'datetime'])) {
         return Html::a($text, null, $this->grid->prepareDetailsLink($model->id));
     }
     return $text;
 }