protected function optgroupNest($data)
{
$html = new Html();
foreach ($data as $nest) {
$nested = isset($nest['subs']) && !empty($nest['subs']) ? $this->optgroupNest($nest['subs']) : '';
$html->tag('optgroup');
isset($nest['class']) && $nest['class'] ? $html->class($nest['class']) : false;
$html->label($nest['label']);
foreach ($nest['options'] as $option) {
$html->tag('option');
isset($option['class']) && $option['class'] ? $html->class($option['class']) : false;
isset($option['value']) ? $html->value($option['value']) : false;
isset($option['selected']) && $option['selected'] ? $html->selected() : false;
$html->text($option['text']);
$html->tag();
}
$html->append($nested);
$html->tag();
}
return $html->give();
}