<?php

class  category{

　　//1、查询出所有分类
    public function gettree(){

             $res  = select * from categore;

             $tree = $this->tree($res);

              return $tree;
    
    }

　　//2、遍历所有分类
    punlic function tree($data,$pid=0,$lev=1){
    
        $tree   = []；
　　　　 foreach($data as $k=>$v){
             $array = $v;
             if($v['parent_id']==$pid){
                   $v['name'] = $v['parent_id']==0 ? $v['name'] :str_repeat('|___',$lev).$v['name'];
                   $tree = $v;
             }
        }
 
       return $tree;

    }






}