官方也有很多高手写的无限极都可以试着学习学习
下面写3种
~~~
<?php
/**
* Created by PhpStorm.
* Date: 16/9/14
* Time: 17:12
*/
//这个是元数据,你可以从数据库里面进行读取并且不需要进行转换
//因为代码部分会进行遍历处理
//-1用于后面的根目录判断
//你也可以修改为0并修改后面的 if ($v['pid'] >= 0) 为 if ($v['pid'] > 0)
//数据库id应该不会出现等于0的情况吧
$list[] = ['id' => 0, 'pid' => -1, 'name' => 'A@0'];
$list[] = ['id' => 1, 'pid' => 0, 'name' => 'A@1'];
$list[] = ['id' => 2, 'pid' => 0, 'name' => 'A@2'];
$list[] = ['id' => 3, 'pid' => 2, 'name' => 'A@3'];
$list[] = ['id' => 4, 'pid' => 3, 'name' => 'A@4'];
$list[] = ['id' => 5, 'pid' => 0, 'name' => 'A@5'];
$list[] = ['id' => 6, 'pid' => 1, 'name' => 'A@6'];
//先初始化目录
$return = [];//索引目录
$parent='';//根目录,
//数组预处理,这里的$v['id']一定要唯一,不然可能会出现被覆盖的情况
foreach ($list as $v)
$return[$v['id']] = [
'id' => $v['id'],
'name' => $v['name'],
'pid' => $v['pid'],
'child' => '',
];
//将每个目录与父目录进行拼接,并找到根目录
//找到父路径,这里没有判断 $return[$v['pid']]['child']是否存在,
//TP5下或者在不存在的情况下可能会报错,自己加一下
foreach ($return as $k => $v) {
if ($v['pid'] >= 0)
$return[$v['pid']]['child'][$v['id']] = &$return[$k];
else
$parent = &$return[$k];
}
//打印根目录
var_export($parent);
~~~
推荐一下[童学芬](http://www.oschina.net/code/snippet_173183_11767)同学 发布于 2013年01月01日 1时, 无限极分类方法
~~~
<?php
/**
* 此方法由@Tonton 提供
* http://my.oschina.net/u/918697
* @date 2012-12-12
*/
function genTree5($items) {
foreach ($items as $item)
$items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];
return isset($items[0]['son']) ? $items[0]['son'] : array();
}
/**
* 将数据格式化成树形结构
* @author Xuefen.Tong
* @param array $items
* @return array
*/
function genTree9($items) {
$tree = array(); //格式化好的树
foreach ($items as $item)
if (isset($items[$item['pid']]))
$items[$item['pid']]['son'][] = &$items[$item['id']];
else
$tree[] = &$items[$item['id']];
return $tree;
}
$items = array(
1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),
2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'),
3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),
4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'),
5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'),
6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'),
7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'),
8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'),
9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),
10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'),
11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'),
12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'),
13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'),
14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'),
15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'),
16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'),
17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'),
18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'),
19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'),
);
echo "<pre>";
print_r(genTree5($items));
print_r(genTree9($items));
//后者输出格式，前者类似，只是数组键值不一样，不过不影响数据结构
/*
Array
(
[0] => Array
(
[id] => 1
[pid] => 0
[name] => 江西省
[son] => Array
(
[0] => Array
(
[id] => 3
[pid] => 1
[name] => 南昌市
)
[1] => Array
(
[id] => 13
[pid] => 1
[name] => 赣州市
[son] => Array
(
[0] => Array
(
[id] => 14
[pid] => 13
[name] => 赣县
[son] => Array
(
[0] => Array
(
[id] => 16
[pid] => 14
[name] => 茅店镇
[son] => Array
(
[0] => Array
(
[id] => 18
[pid] => 16
[name] => 义源村
)
[1] => Array
(
[id] => 19
[pid] => 16
[name] => 上坝村
)
)
)
[1] => Array
(
[id] => 17
[pid] => 14
[name] => 大田乡
)
)
)
[1] => Array
(
[id] => 15
[pid] => 13
[name] => 于都县
)
)
)
)
)
[1] => Array
(
[id] => 2
[pid] => 0
[name] => 黑龙江省
[son] => Array
(
[0] => Array
(
[id] => 4
[pid] => 2
[name] => 哈尔滨市
[son] => Array
(
[0] => Array
(
[id] => 6
[pid] => 4
[name] => 香坊区
[son] => Array
(
[0] => Array
(
[id] => 8
[pid] => 6
[name] => 和兴路
[son] => Array
(
[0] => Array
(
[id] => 10
[pid] => 8
[name] =>
东北林业大学
)
[1] => Array
(
[id] => 12
[pid] => 8
[name] =>
哈尔滨师范大学
)
)
)
)
)
[1] => Array
(
[id] => 7
[pid] => 4
[name] => 南岗区
[son] => Array
(
[0] => Array
(
[id] => 9
[pid] => 7
[name] => 西大直街
[son] => Array
(
[0] => Array
(
[id] => 11
[pid] => 9
[name] =>
哈尔滨工业大学
)
)
)
)
)
)
)
[1] => Array
(
[id] => 5
[pid] => 2
[name] => 鸡西市
)
)
)
)*/
~~~
