这里真的有两个问题;为什么会这样?可以做些什么呢?
抱歉这个问题太长了,但大部分只是print_r
输出!
基本上,我从一个扁平的标签数组 ( $tags
) 开始,每个标签都有一个id
(数组索引),name
并且parent_id
. 然后我递归迭代$tags
并将所有子标签嵌套在它们的父标签中。(见下文)
有用!(见下文输出)。但是我遇到的问题是我的平面标签数组是从执行嵌套/递归的函数中写入的。(见下文)
标签的扁平数组:
Array
(
[1] => stdClass Object
(
[name] => instruments
[parent_id] => 0
)
[2] => stdClass Object
(
[name] => strings
[parent_id] => 1
)
[3] => stdClass Object
(
[name] => violin
[parent_id] => 2
)
[4] => stdClass Object
(
[name] => cello
[parent_id] => 2
)
[5] => stdClass Object
(
[name] => woodwind
[parent_id] => 1
)
[6] => stdClass Object
(
[name] => flute
[parent_id] => 5
)
)
这是嵌套子标签的递归调用函数。问题在于if
:我分配$tag
给它$tree[$i]
,然后将children
属性添加到它。这导致children
属性被添加到$tag
. 这就是我想要停止发生的事情。
public function tags_to_tree($tags, $parent_id = 0)
{
$tree = array();
foreach($tags as $i => $tag)
{
// add this tag node and all children (depth-first recursive)
if(intval($parent_id) === intval($tag->parent_id))
{
$tree[$i] = $tag;
$tree[$i]->children = $this->tags_to_tree($tags, $i);
}
}
return $tree;
}
嵌套标签输出:
Array
(
[1] => stdClass Object
(
[name] => instruments
[parent_id] => 0
[children] => Array
(
[2] => stdClass Object
(
[name] => strings
[parent_id] => 1
[children] => Array
(
[3] => stdClass Object
(
[name] => violin
[parent_id] => 2
)
[4] => stdClass Object
(
[name] => cello
[parent_id] => 2
)
)
)
[5] => stdClass Object
(
[name] => woodwind
[parent_id] => 1
[children] => Array
(
[6] => stdClass Object
(
[name] => flute
[parent_id] => 5
)
)
)
)
)
)
children
将属性添加到$tree[$i]
或分配$tag
到$tree[$i]
以阻止这种情况发生时,我可以做些什么不同的事情?
谢谢!