无限级分类范例

public function getTree($parent_id=0 , $lev=1) {$tree = array();foreach($this->cats as $v) {if($v['parent_id'] == $parent_id) {$v['lev'] = $lev;$tree[] = $v;$tree = array_merge($tree , $this->getTree($v['cat_id'] , $lev+1) );}}return $tree;}