Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Alignment.php
public function setVertical($pValue)
    {
        if ($pValue == '') {
            $pValue = self::VERTICAL_BOTTOM;
        }

        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['vertical' => $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->vertical = $pValue;
        }

        return $this;
    }
public function setVertical($pValue)
    {
        if ($pValue == '') {
            $pValue = self::VERTICAL_BOTTOM;
        }

        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['vertical' => $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->vertical = $pValue;
        }

        return $this;
    }
Set Vertical.

@param string $pValue see self::VERTICAL_*

@return Alignment