function getTree($gets, $category = 'fid', $order = 'id desc')
{
$gets['order'] = $category . ',' . $order;
$list = $this->gets($gets);
foreach ($list as $li) {
if ($li[$category] == 0) {
$new[$li[$this->primary]] = $li;
} else {
$new[$li[$category]]['child'][$li[$this->primary]] = $li;
}
}
return $new;
}