version：1.4
author：Veris
website：www.mostclan.com
更多PHP姿势尽在http://www.mostclan.com，欢迎大家一起编程划水！
ClassTree.class.php
<?php
/**
* 无限分类树（支持子分类排序）
* version：1.4
* author：Veris
* website：www.mostclan.com
*/
class ClassTree {
/**
* 分类排序（降序）
*/
static public function sort($arr,$cols){
//子分类排序
foreach ($arr as $k => &$v) {
if(!empty($v['sub'])){
$v['sub']=self::sort($v['sub'],$cols);
}
$sort[$k]=$v[$cols];
}
if(isset($sort))
array_multisort($sort,SORT_DESC,$arr);
return $arr;
}
/**
* 横向分类树
*/
static public function hTree($arr,$pid=0){
foreach($arr as $k => $v){
if($v['pid']==$pid){
$data[$v['id']]=$v;
$data[$v['id']]['sub']=self::hTree($arr,$v['id']);
}
}
return isset($data)?$data:array();
}
/**
* 纵向分类树
*/
static public function vTree($arr,$pid=0){
foreach($arr as $k => $v){
if($v['pid']==$pid){
$data[$v['id']]=$v;
$data+=self::vTree($arr,$v['id']);
}
}
return isset($data)?$data:array();
}
}使用例子：<?php
include 'ClassTree.class.php';
//===========================Example===========================
$arr=array(
array('id'=>1,'pid'=>0,'name'=>'浙江','sort'=>0),
array('id'=>10,'pid'=>1,'name'=>'宁波','sort'=>0),
array('id'=>13,'pid'=>1,'name'=>'金华','sort'=>1),
array('id'=>4,'pid'=>0,'name'=>'上海','sort'=>2),
array('id'=>5,'pid'=>4,'name'=>'闵行','sort'=>0),
array('id'=>6,'pid'=>10,'name'=>'宁海','sort'=>0),
);
$arr=ClassTree::sort($arr,'sort');
$data=ClassTree::vTree($arr);
$data2=ClassTree::hTree($arr);
echo '<pre>';
print_r($data);
print_r($data2);返回例子：Array
(
[4] => Array
(
[id] => 4
[pid] => 0
[name] => 上海
[sort] => 2
)
[5] => Array
(
[id] => 5
[pid] => 4
[name] => 闵行
[sort] => 0
)
[1] => Array
(
[id] => 1
[pid] => 0
[name] => 浙江
[sort] => 0
)
[13] => Array
(
[id] => 13
[pid] => 1
[name] => 金华
[sort] => 1
)
[10] => Array
(
[id] => 10
[pid] => 1
[name] => 宁波
[sort] => 0
)
[6] => Array
(
[id] => 6
[pid] => 10
[name] => 宁海
[sort] => 0
)
)
Array
(
[4] => Array
(
[id] => 4
[pid] => 0
[name] => 上海
[sort] => 2
[sub] => Array
(
[5] => Array
(
[id] => 5
[pid] => 4
[name] => 闵行
[sort] => 0
[sub] => Array
(
)
)
)
)
[1] => Array
(
[id] => 1
[pid] => 0
[name] => 浙江
[sort] => 0
[sub] => Array
(
[13] => Array
(
[id] => 13
[pid] => 1
[name] => 金华
[sort] => 1
[sub] => Array
(
)
)
[10] => Array
(
[id] => 10
[pid] => 1
[name] => 宁波
[sort] => 0
[sub] => Array
(
[6] => Array
(
[id] => 6
[pid] => 10
[name] => 宁海
[sort] => 0
[sub] => Array
(
)
)
)
)
)
)
) 