/**
* 重组数组，无限极分类
* 数组变为多维数组
* @param array $arr
* @param int $parent_id
* @return array $list
*/
public static function childList($arr, $pid = 0)
{
$list = array();
foreach ($arr as $v) {
if ($v['parent_id'] == $pid) {
//找到子节点,继续找该子节点的后代节点
$v['child'] = Tools::childList($arr, $v['id']);
$list[] = $v;
}
}
return $list;
}
