首先创建无限分类的数据表，我这里采用的是id、name、pid这种类型（当然还有很多种无限分类的方式了，比如：id、name、pid、path。left、right左右节点的形式）
CREATE TABLE `class` (
`id` int(10) unsigned NOT NULL auto_increment,
`name` varchar(128) default NULL,
`pid` int(11) default NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8
我这里就用数组来模拟，不添加数据了。。。
$items = array(
1 => array('sid' => 1, 'pid' => 0, 'name' => '江西省'),
2 => array('sid' => 2, 'pid' => 0, 'name' => '黑龙江省'),
3 => array('sid' => 3, 'pid' => 1, 'name' => '南昌市'),
4 => array('sid' => 4, 'pid' => 2, 'name' => '哈尔滨市'),
5 => array('sid' => 5, 'pid' => 2, 'name' => '鸡西市'),
6 => array('sid' => 6, 'pid' => 4, 'name' => '香坊区'),
7 => array('sid' => 7, 'pid' => 4, 'name' => '南岗区'),
8 => array('sid' => 8, 'pid' => 6, 'name' => '和兴路'),
9 => array('sid' => 9, 'pid' => 7, 'name' => '西大直街'),
10 => array('sid' => 10, 'pid' => 8, 'name' => '东北林业大学'),
11 => array('sid' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'),
12 => array('sid' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'),
13 => array('sid' => 13, 'pid' => 1, 'name' => '赣州市'),
14 => array('sid' => 14, 'pid' => 13, 'name' => '赣县'),
15 => array('sid' => 15, 'pid' => 13, 'name' => '于都县'),
16 => array('sid' => 16, 'pid' => 14, 'name' => '茅店镇'),
17 => array('sid' => 17, 'pid' => 14, 'name' => '大田乡'),
18 => array('sid' => 18, 'pid' => 16, 'name' => '义源村'),
19 => array('sid' => 19, 'pid' => 16, 'name' => '上坝村'),
20 => array('sid' => 20, 'pid' => 0, 'name' => '广东省'),
21 => array('sid' => 21, 'pid' => 20, 'name' => '广州市'),
22 => array('sid' => 22, 'pid' => 20, 'name' => '东莞市'),
);
代码如下：
$t = array();
foreach ($items as $id => $item) {
echo $item['pid'];
if ($item['pid']) {
$items[$item['pid']][$item['sid']] = &$items[$item['sid']];
$t[] = $id;
}
}
foreach($t as $u) {
unset($items[$u]);
}
echo "
";<br>print_r($items);<br>echo "
打印的结果如下：
以上代码是我在网上搜集的，觉得比较经典，而且相对于其他的来说，代码量也少。。
感谢网络中的大神能和我们一起分享。。。
