dokuwiki\Form\DropdownElement::optGroups PHP Метод

    public function optGroups($optGroups = null)
    {
        if ($optGroups === null) {
            return $this->optGroups;
        }
        if (!is_array($optGroups)) {
            throw new \InvalidArgumentException(hsc('Argument must be an associative array of label => [options]!'));
        }
        $this->optGroups = array();
        foreach ($optGroups as $label => $options) {
            $this->addOptGroup($label, $options);
        }
        return $this;
    }