kartik\grid\ColumnTrait::renderHeaderCell PHP Méthode

    public function renderHeaderCell()
    {
        if ($this->grid->filterModel !== null && $this->mergeHeader && $this->grid->filterPosition === GridView::FILTER_POS_BODY) {
            $this->headerOptions['rowspan'] = 2;
            Html::addCssClass($this->headerOptions, 'kv-merged-header');
        }
        $this->headerOptions['data-col-seq'] = array_search($this, $this->grid->columns);
        /** @noinspection PhpUndefinedClassInspection */
        /** @noinspection PhpUndefinedMethodInspection */
        return parent::renderHeaderCell();
    }