php无限极分类对象封装

<?php
namespace Library\Org\Util;
class Category{
    //组合一维数组
    static public function unlimitedForLelel($cate,$html = '--',$pid = 0,$level = 0){
        $arr = array();
        foreach($cate as $v){
            if($v['pid'] == $pid){
                $v['level'] = $level + 1;
                $v['html'] = str_repeat($html,$level);
                $arr[] = $v;
                $arr = array_merge($arr,self::unlimitedForLelel($cate,$html,$v['id'],$v['level']));
            }
        }
        return $arr;
    }
    //组合多维数组
    static public function unlimitedForLayer($cate,$name = 'child',$pid = 0){
        $arr = array();
        foreach($cate as $v){
            if($v['pid'] == $pid){
                $v[$name] = self::unlimitedForLayer($cate,$name,$v['id']);
                $arr[] = $v;
            }
        }
        return $arr;
    }
    //传递一个子分类ID返回所有的父级分类（面包屑）
    static public function getParents($cate,$id){
        $arr = array();
        foreach($cate as $v){
            if($v['id'] == $id){
                $arr[] = $v;
                $arr = array_merge(self::getParents($cate,$v['pid']),$arr);
            }
        }
        return $arr;
    }
    //传递一个父级分类ID返回所有的子级分类
    static public function getChilds($cate,$pid){
        $arr = array();
        foreach($cate as $v){
            if($v['pid'] == $pid){
                $arr[] = $v;
                $arr = array_merge($arr,self::getChilds($cate,$v['id']));
            }
        }
        return $arr;
    }
    //传递一个父级分类ID返回所有的子级分类ID
    static public function getChildsId($cate,$pid){
        $arr = array();
        foreach($cate as $v){
            if($v['pid'] == $pid){
                $arr[] = $v['id'];
                $arr = array_merge($arr,self::getChilds($cate,$v['id']));
            }
        }
        return $arr;
    }
}