LdapTools\AttributeConverter\ConvertGroupType::modifyBitmaskValue PHP Method

    protected function modifyBitmaskValue($value, $toggle, $attribute)
    {
        $bit = $this->getBitForAttribute($attribute);
        if ($toggle) {
            $value = (int) $value + (int) $bit;
        } else {
            $value = (int) $value - (int) $bit;
        }
        return $value;
    }