site/extend/catetree/Catetree.php

<?php
namespace catetree;

class Catetree{

	//无限级分类
	
     public function getMenu($menu){
       return $this->sort($menu);   //返回排序成功后的数据
     }

     //对栏目进行排序
     public function sort($menu,$pid=0,$level=0){
        static $arr=array();  //静态数组
        foreach ($menu as $k => $v) {  //遍历数据
          if($v['pid']==$pid){     //第一次 pid=0 的顶级数组全部循环出来
          	$v['level']=$level;
            $arr[]=$v;
            $this->sort($menu,$v['id'],$level+1);  //递归找下级子栏目
          }
        }

        return $arr;
     }



  //获取子栏目id

   public function childrenids($cateid,$obj){
        $data=$obj->field('id,pid')->select();
        return $this->_childrenids($data,$cateid);
   }

   private function _childrenids($data,$cateid){
        static $arr=array();
        foreach ($data as $k => $v) {
            if($v['pid']==$cateid){
                $arr[]=$v['id'];
                $this->_childrenids($data,$v['id']);
            }
        }

        return $arr;
   }


   //处理栏目排序
   public function cateSort($data,$obj){
    foreach ($data as $k => $v) {
        $obj->update(['id'=>$k,'sort'=>$v]);
    }
   }



   //处理批量删除

   public function pdel($cateids){
            foreach ($cateids as $k => $v) {
                $childrenidsarr[]=$this->childrenids($v);
                $childrenidsarr[]=(int)$v;
            }  
            $_childrenidsarr=array();
            foreach ($childrenidsarr as $k => $v) {
                if(is_array($v)){
                    foreach ($v as $k1 => $v1) {
                       $_childrenidsarr[]=$v1;
                    }
                }else{
                    $_childrenidsarr[]=$v;
                }
            }
            $_childrenidsarr=array_unique($_childrenidsarr);
            $this::destroy($_childrenidsarr);
    
   }



















}