Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Color.php
public function setRGB($pValue)
    {
        if ($pValue == '') {
            $pValue = '000000';
        }
        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['argb' => 'FF' . $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->argb = 'FF' . $pValue;
        }

        return $this;
    }
public function setRGB($pValue)
    {
        if ($pValue == '') {
            $pValue = '000000';
        }
        if ($this->isSupervisor) {
            $styleArray = $this->getStyleArray(['argb' => 'FF' . $pValue]);
            $this->getActiveSheet()->getStyle($this->getSelectedCells())->applyFromArray($styleArray);
        } else {
            $this->argb = 'FF' . $pValue;
        }

        return $this;
    }
Set RGB.

@param string $pValue RGB value

@return Color