kartik\grid\CheckboxColumn::renderDataCell PHP Method

    public function renderDataCell($model, $key, $index)
    {
        $options = $this->fetchContentOptions($model, $key, $index);
        if ($this->rowHighlight) {
            Html::addCssClass($options, 'kv-row-select');
        }
        $this->initPjax($this->_clientScript);
        if ($this->attribute !== null) {
            $this->name = Html::getInputName($model, "[{$index}]{$this->attribute}");
            $this->checkboxOptions['value'] = Html::getAttributeValue($model, $this->attribute);
        }
        return Html::tag('td', $this->renderDataCellContent($model, $key, $index), $options);
    }