AdminPageFramework_Input_select::_getOptGroup PHP Method

    private function _getOptGroup(array $aBaseAttributes, $sInputID, $sKey, $asLabel)
    {
        $_aOptGroupAttributes = isset($aBaseAttributes['optgroup'][$sKey]) && is_array($aBaseAttributes['optgroup'][$sKey]) ? $aBaseAttributes['optgroup'][$sKey] + $aBaseAttributes['optgroup'] : $aBaseAttributes['optgroup'];
        $_aOptGroupAttributes = array('label' => $sKey) + $_aOptGroupAttributes;
        return "<optgroup " . $this->getAttributes($_aOptGroupAttributes) . ">" . $this->_getDropDownList($sInputID, $asLabel, $aBaseAttributes) . "</optgroup>";
    }