将平面数组转换为多维数组 [英] Convert flat array to the multi-dimensional

问题描述

我有一个包含树数据的数组(按父 ID).我想将其转换为多维数组.实现这一目标的最佳方法是什么?有什么简短的功能吗?

I have an array with tree data (by parent id). I want to convert it to multidimensional array. What is the best way to achieve that? Is there any short function for that?

源数组:

$source = array(
    '0' => array(
            'Menu' => array(
                    'id' => 45
                    'name' => 'Home'
                    'parent_id' => 1
            )
    )
    '1' => array(
            'Menu' => array(
                    'id' => 47
                    'name' => 'Get started'
                    'parent_id' => 1
            )
    )
    '2' => array(
            'Menu' => array(
                    'id' => 72
                    'name' => 'Attributes'
                    'parent_id' => 71
            )
    )
    '3' => array(
            'Menu' => array(
                    'id' => 73
                    'name' => 'Headings'
                    'parent_id' => 71
            )
    )
    '4' => array(
            'Menu' => array(
                    'id' => 75
                    'name' => 'Links'
                    'parent_id' => 71
            )
    )
    '5' => array(
            'Menu' => array(
                    'id' => 59
                    'name' => 'Images'
                    'parent_id' => 75
            )
    )
    '6' => array(
            'Menu' => array(
                    'id' => 65
                    'name' => 'Lists'
                    'parent_id' => 75
            )
    )
);

源数组中缺少一些父项.我希望缺少父项的项目是根.结果数组:

Some parents are missing from the source array. I would like the items with missing parent to be root. Result array:

$result = array(
    '0' => array(
            'Menu' => array(
                    'id' => 45
                    'name' => 'Home'
                    'parent_id' => 1
            )
            'Children' => array()
    )
    '1' => array(
            'Menu' => array(
                    'id' => 47
                    'name' => 'Get started'
                    'parent_id' => 1
            )
            'Children' => array()
    )
    '2' => array(
            'Menu' => array(
                    'id' => 72
                    'name' => 'Attributes'
                    'parent_id' => 71
            )
            'Children' => array()
    )
    '3' => array(
            'Menu' => array(
                    'id' => 73
                    'name' => 'Headings'
                    'parent_id' => 71
            )
            'Children' => array()
    )
    '4' => array(
            'Menu' => array(
                    'id' => 75
                    'name' => 'Links'
                    'parent_id' => 71
            )
            'Children' => array(
                    '0' => array(
                        'Menu' => array(
                            'id' => 59
                            'name' => 'Images'
                            'parent_id' => 75
                        )
                        'Children' => array()
                    )
                    '1' => array(
                        'Menu' => array(
                            'id' => 65
                            'name' => 'Lists'
                            'parent_id' => 75
                        )
                        'Children' => array()
                   )
            )
     )
);

更新:删除了方括号.

推荐答案

我认为 PHP 中没有内置函数可以做到这一点.

I don't think there is a built-in function in PHP that does this.

我尝试了以下代码，似乎可以按照您描述的方式准备嵌套数组:

I tried the following code, and it seems to work to prepare the nested array the way you describe:

$nodes = array();
$tree = array();
foreach ($source as &$node) {
  $node["Children"] = array();
  $id = $node["Menu"]["id"];
  $parent_id = $node["Menu"]["parent_id"];
  $nodes[$id] =& $node;
  if (array_key_exists($parent_id, $nodes)) {
    $nodes[$parent_id]["Children"][] =& $node;
  } else {
    $tree[] =& $node;
  }
}

var_dump($tree);

我在为演示文稿编写的 PHP 类中编写了一个类似的算法 Hierarchical Models在 SQL 和 PHP 中，但我使用的是对象而不是普通数组.

I wrote a similar algorithm in a PHP class I wrote for my presentation Hierarchical Models in SQL and PHP, but I was using objects instead of plain arrays.

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