官方也有很多高手寫的無限極都可以試著學習學習
下面寫3種
~~~
<?php
/**
* Created by PhpStorm.
* Date: 16/9/14
* Time: 17:12
*/
//這個是元數據,你可以從數據庫里面進行讀取并且不需要進行轉換
//因為代碼部分會進行遍歷處理
//-1用于后面的根目錄判斷
//你也可以修改為0并修改后面的 if ($v['pid'] >= 0) 為 if ($v['pid'] > 0)
//數據庫id應該不會出現等于0的情況吧
$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'];
//先初始化目錄
$return = [];//索引目錄
$parent='';//根目錄,
//數組預處理,這里的$v['id']一定要唯一,不然可能會出現被覆蓋的情況
foreach ($list as $v)
$return[$v['id']] = [
'id' => $v['id'],
'name' => $v['name'],
'pid' => $v['pid'],
'child' => '',
];
//將每個目錄與父目錄進行拼接,并找到根目錄
//找到父路徑,這里沒有判斷 $return[$v['pid']]['child']是否存在,
//TP5下或者在不存在的情況下可能會報錯,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[$k];
}
//打印根目錄
var_export($parent);
~~~
推薦一下[童學芬](http://www.oschina.net/code/snippet_173183_11767)同學 發布于 2013年01月01日 1時, 無限極分類方法
~~~
<?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();
}
/**
* 將數據格式化成樹形結構
* @author Xuefen.Tong
* @param array $items
* @return array
*/
function genTree9($items) {
$tree = array(); //格式化好的樹
foreach ($items as $item)
if (isset($items[$item['pid']]))
$items[$item['pid']]['son'][] = &$items[$item['id']];
else
$tree[] = &$items[$item['id']];
return $tree;
}
$items = array(
1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),
2 => array('id' => 2, 'pid' => 0, 'name' => '黑龍江省'),
3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),
4 => array('id' => 4, 'pid' => 2, 'name' => '哈爾濱市'),
5 => array('id' => 5, 'pid' => 2, 'name' => '雞西市'),
6 => array('id' => 6, 'pid' => 4, 'name' => '香坊區'),
7 => array('id' => 7, 'pid' => 4, 'name' => '南崗區'),
8 => array('id' => 8, 'pid' => 6, 'name' => '和興路'),
9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),
10 => array('id' => 10, 'pid' => 8, 'name' => '東北林業大學'),
11 => array('id' => 11, 'pid' => 9, 'name' => '哈爾濱工業大學'),
12 => array('id' => 12, 'pid' => 8, 'name' => '哈爾濱師范大學'),
13 => array('id' => 13, 'pid' => 1, 'name' => '贛州市'),
14 => array('id' => 14, 'pid' => 13, 'name' => '贛縣'),
15 => array('id' => 15, 'pid' => 13, 'name' => '于都縣'),
16 => array('id' => 16, 'pid' => 14, 'name' => '茅店鎮'),
17 => array('id' => 17, 'pid' => 14, 'name' => '大田鄉'),
18 => array('id' => 18, 'pid' => 16, 'name' => '義源村'),
19 => array('id' => 19, 'pid' => 16, 'name' => '上壩村'),
);
echo "<pre>";
print_r(genTree5($items));
print_r(genTree9($items));
//后者輸出格式，前者類似，只是數組鍵值不一樣，不過不影響數據結構
/*
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] => 贛州市
[son] => Array
(
[0] => Array
(
[id] => 14
[pid] => 13
[name] => 贛縣
[son] => Array
(
[0] => Array
(
[id] => 16
[pid] => 14
[name] => 茅店鎮
[son] => Array
(
[0] => Array
(
[id] => 18
[pid] => 16
[name] => 義源村
)
[1] => Array
(
[id] => 19
[pid] => 16
[name] => 上壩村
)
)
)
[1] => Array
(
[id] => 17
[pid] => 14
[name] => 大田鄉
)
)
)
[1] => Array
(
[id] => 15
[pid] => 13
[name] => 于都縣
)
)
)
)
)
[1] => Array
(
[id] => 2
[pid] => 0
[name] => 黑龍江省
[son] => Array
(
[0] => Array
(
[id] => 4
[pid] => 2
[name] => 哈爾濱市
[son] => Array
(
[0] => Array
(
[id] => 6
[pid] => 4
[name] => 香坊區
[son] => Array
(
[0] => Array
(
[id] => 8
[pid] => 6
[name] => 和興路
[son] => Array
(
[0] => Array
(
[id] => 10
[pid] => 8
[name] =>
東北林業大學
)
[1] => Array
(
[id] => 12
[pid] => 8
[name] =>
哈爾濱師范大學
)
)
)
)
)
[1] => Array
(
[id] => 7
[pid] => 4
[name] => 南崗區
[son] => Array
(
[0] => Array
(
[id] => 9
[pid] => 7
[name] => 西大直街
[son] => Array
(
[0] => Array
(
[id] => 11
[pid] => 9
[name] =>
哈爾濱工業大學
)
)
)
)
)
)
)
[1] => Array
(
[id] => 5
[pid] => 2
[name] => 雞西市
)
)
)
)*/
~~~
