tree.php是什么功能？请详细介绍一下？

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phppublic function listLevel($arr, $pid=0, $lev=0) { $data=array(); foreach ($arr as $k=> $v) { if ($v['pid']==$pid) { $v['level']=$lev; $data[]=$v; $data=array_merge($data, $this->listLevel($arr, $v['id'], $lev + 1)); } } return $data;}

tree.php

public function list_level($arr,$pid=0,$lev=0){ $data = array(); foreach($arr as $k=>$v){ if($v['pid'] == $pid){ $v['level'] = $lev; $data[] = $v; $data=array_merge($data,$this->list_level($arr,$v['id'],$lev+1)); } } return $data; }