Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Spreadsheet.php
public function addCellStyleXf(Style $pStyle)
    {
        $this->cellStyleXfCollection[] = $pStyle;
        $pStyle->setIndex(count($this->cellStyleXfCollection) - 1);
    }
public function addCellStyleXf(Style $pStyle)
    {
        $this->cellStyleXfCollection[] = $pStyle;
        $pStyle->setIndex(count($this->cellStyleXfCollection) - 1);
    }
Add a cellStyleXf to the workbook.

@param Style $pStyle