Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Color.php
public function setARGB($pValue)
    {
        if ($pValue == '') {
            $pValue = self::COLOR_BLACK;
        }
        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['argb' => $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->argb = $pValue;
        }

        return $this;
    }
public function setARGB($pValue)
    {
        if ($pValue == '') {
            $pValue = self::COLOR_BLACK;
        }
        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['argb' => $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->argb = $pValue;
        }

        return $this;
    }
Set ARGB.

@param string $pValue see self::COLOR_*

@return Color