自己试着写了个无限级分类的，结果有些问题，想了很长时间了，感觉代码没问题呀，可就是结果不正确。现在整个人都懵了....
网上的栗子看了些，貌似写法跟我的不一样。
数组结构如下:
<code>Array
(
[0] => Array
(
[id] => 1
[name] => 代码
[parent] => 0
)
[1] => Array
(
[id] => 3
[name] => 动漫
[parent] => 0
)
[2] => Array
(
[id] => 4
[name] => 治愈
[parent] => 3
)
[3] => Array
(
[id] => 5
[name] => 励志
[parent] => 3
)
[4] => Array
(
[id] => 6
[name] => 机战
[parent] => 3
)
[5] => Array
(
[id] => 7
[name] => 百合
[parent] => 3
)
[6] => Array
(
[id] => 8
[name] => 资源
[parent] => 0
)
[7] => Array
(
[id] => 9
[name] => app
[parent] => 8
)
[8] => Array
(
[id] => 10
[name] => 软件
[parent] => 8
)
[9] => Array
(
[id] => 11
[name] => 黑科技
[parent] => 8
)
)</code>其中 id 为分类唯一ID, parent 为父类ID
我写的代码 如下:
<code>
function all($id=0){
static $_class = null;
if(is_null($_class))
$_class = select(); //这个得出来的就是以上的数组结构，然后赋值给了`$_class`变量
$result = array();
foreach($_class as $k => $v){
if($v['parent'] == $id){
unset($_class[$k]);
$v = array_merge($v, $this->all($v['id']));
$result['child'][] = $v;
}
}
return $result;
}
print_r(all(0));</code>自己试着写了个无限级分类的，结果有些问题，想了很长时间了，感觉代码没问题呀，可就是结果不正确。现在整个人都懵了....
网上的栗子看了些，貌似写法跟我的不一样。
数组结构如下:
<code>Array
(
[0] => Array
(
[id] => 1
[name] => 代码
[parent] => 0
)
[1] => Array
(
[id] => 3
[name] => 动漫
[parent] => 0
)
[2] => Array
(
[id] => 4
[name] => 治愈
[parent] => 3
)
[3] => Array
(
[id] => 5
[name] => 励志
[parent] => 3
)
[4] => Array
(
[id] => 6
[name] => 机战
[parent] => 3
)
[5] => Array
(
[id] => 7
[name] => 百合
[parent] => 3
)
[6] => Array
(
[id] => 8
[name] => 资源
[parent] => 0
)
[7] => Array
(
[id] => 9
[name] => app
[parent] => 8
)
[8] => Array
(
[id] => 10
[name] => 软件
[parent] => 8
)
[9] => Array
(
[id] => 11
[name] => 黑科技
[parent] => 8
)
)</code>其中 id 为分类唯一ID, parent 为父类ID
我写的代码 如下:
<code>
function all($id=0){
static $_class = null;
if(is_null($_class))
$_class = select(); //这个得出来的就是以上的数组结构，然后赋值给了`$_class`变量
$result = array();
foreach($_class as $k => $v){
if($v['parent'] == $id){
unset($_class[$k]);
$v = array_merge($v, $this->all($v['id']));
$result['child'][] = $v;
}
}
return $result;
}
print_r(all(0));</code>
unset($_class[$k]);
这一行去掉
鉴于你这个还是用的递归来完成的，我这里提供2个方法，一个是递归的，一个是指针形态的。
第二个可能您暂时无法理解，但是为帮助您学习，以及方便到他人，以下是代码：
<code>// 呃，我真不忍心写出这个循环那么多遍的代码，求神解救我。
function _data_to_tree(&$items, $topid = 0, $with_id = TRUE)
{
$result = [];
foreach($items as $v)
if ($topid == $v['parent']) {
$r = $v + ['children' => _data_to_tree($items, $v['id'], $with_id)];
if ($with_id)
$result[$v['id']] = $r;
else
$result[] = $r;
}
return $result;
}
</code><code>function _data_to_tree($items, $topid = 0, $with_id = TRUE)
{
if ($with_id)
foreach ($items as $item)
$items[ $item['parent'] ]['children'][ $item['id'] ] = &$items[ $item['id'] ];
else
foreach ($items as $item)
$items[ $item['parent'] ]['children'][] = &$items[ $item['id'] ];
return isset($items[ $topid ]['children']) ? $items[ $topid ][ 'children' ] : [];
}</code>传入你的上述数组，比如最顶层的ID为0
<code>$data = [ ['id' => 4, 'parent' => 1 , 'text' => 'Parent1'], ['id' => 1, 'parent' => 0 , 'text' => 'Root'], ['id' => 2, 'parent' => 1 , 'text' => 'Parent2'], ['id' => 3, 'parent' => 2 , 'text' => 'Sub1'], ]; print_r ( _data_to_tree($data, 0) ); </code>
<code>Array
(
[1] => Array
(
[id] => 1
[parent] => 0
[text] => Root
[children] => Array
(
[4] => Array
(
[id] => 4
[parent] => 1
[text] => Parent1
[children] => Array
(
)
)
[2] => Array
(
[id] => 2
[parent] => 1
[text] => Parent2
[children] => Array
(
[3] => Array
(
[id] => 3
[parent] => 2
[text] => Sub1
[children] => Array
(
)
)
)
)
)
)
)</code>
