<?php

        /*

        *     无限极分类 类

        */

    header("Content-Type: text/html; charset=UTF-8");

    Class Category {

        //组合一维数组

        Static Public function unlimitedForLevel ($cate, $html = '--', $pid = 0, $level = 0) {

            $arr = array();

            foreach ($cate as $k => $v) {

                if ($v['pid'] == $pid) {

                    $v['level'] = $level + 1;

                    $v['html']  = str_repeat($html, $level);

                    $arr[] = $v;

                    $arr = array_merge($arr, self::unlimitedForLevel($cate, $html, $v['id'], $level + 1));

                }

            }

            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

        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返回所有子分类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::getChildsId($cate, $v['id']));

                }

            }

            return $arr;

        }

        //传递一个父级分类ID返回所有子分类

        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;

        }

    }

$cate = array(

    0 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),

    1 => array('id' => 2, 'pid' => 0, 'name' => '浙江省'),

    2 => array('id' => 3, 'pid' => 1, 'name' => '上饶市'),

    3 => array('id' => 4, 'pid' => 3, 'name' => '广丰县'),

    4 => array('id' => 5, 'pid' => 2, 'name' => '杭州市'),

    5 => array('id' => 6, 'pid' => 5, 'name' => '西湖'),

    6 => array('id' => 7, 'pid' => 6, 'name' => '断桥'),

);

//print_r(Category::unlimitedForLevel($cate));

print_r(Category::unlimitedForLayer($cate));

//print_r(Category::getParents($cate,7));

//print_r(Category::getChildsId($cate,2));

//print_r(Category::getChilds($cate,2));

 ?>