PHP展平数组并添加深度键 [英] PHP flatten array and add depth key
本文介绍了PHP展平数组并添加深度键的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有以下数组:
Array
(
[0] => Array
(
[id] => 2
[title] => Root 2
[description] =>
[site_id] => 1
[parent_id] => 0
[created_at] =>
[updated_at] =>
[children] => Array
(
[0] => Array
(
[id] => 4
[title] => Child 2
[description] =>
[site_id] => 1
[parent_id] => 2
[created_at] =>
[updated_at] =>
[children] => Array
(
[0] => Array
(
[id] => 6
[title] => Child 4
[description] =>
[site_id] => 1
[parent_id] => 4
[created_at] =>
[updated_at] =>
)
)
)
)
)
[2] => Array
(
[id] => 7
[title] => Root 3
[description] =>
[site_id] => 1
[parent_id] => 0
[created_at] =>
[updated_at] =>
)
)
我想将其展平为以下内容:
I would like to flatten it to something like the following:
Array
(
[0] => Array
(
[id] => 2
[title] => Root 2
[description] =>
[site_id] => 1
[parent_id] => 0
[created_at] =>
[updated_at] =>
[depth] => 0
)
[1] => Array
(
[id] => 4
[title] => Child 2
[description] =>
[site_id] => 1
[parent_id] => 2
[created_at] =>
[updated_at] =>
[depth] => 1
)
[2] => Array
(
[id] => 6
[title] => Child 4
[description] =>
[site_id] => 1
[parent_id] => 4
[created_at] =>
[updated_at] =>
[depth] => 2
)
[3] => Array
(
[id] => 7
[title] => Root 3
[description] =>
[site_id] => 1
[parent_id] => 0
[created_at] =>
[updated_at] =>
[depth] => 0
)
)
请注意深度"键-这应指示元素在原始数组中的深度
Note the "depth" key - this should indicate how deep in original array the element was
自调用/递归函数没问题
Self calling/recursive functions are no problem
有什么想法吗?
推荐答案
function flatten($elements, $depth) {
$result = array();
foreach ($elements as $element) {
$element['depth'] = $depth;
if (isset($element['children'])) {
$children = $element['children'];
unset($element['children']);
} else {
$children = null;
}
$result[] = $element;
if (isset($children)) {
$result = array_merge($result, flatten($children, $depth + 1));
}
}
return $result;
}
//call it like this
flatten($tree, 0);
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