public function renderSubMenu($id)
{
$ul = new Ul();
foreach ($this->items as $v) {
if ($v['menu_item_parent'] === $id) {
$ul->appendLi(new Li($v['menu_item_name'], $v['menu_item_url'], $this->renderSubMenu($v['menu_item_id']), $this->caret), $this->sub_ul_tpl);
}
}
return $ul;
}
