如何为使用PHP递归函数返回数组？ [英] How to return array for a recursive function using PHP?

问题描述

我有一个多维数组是这样的：

I have a Multi-dimensional array like this:

<pre>Array
(
    [0] => Array
        (
            [id] => 52a83521-0914-4264-8fd9-07d9c601692a
            [role_id] => 2
            [children] => Array
                (
                    [0] => Array
                        (
                            [id] => 54c1f5e4-b52c-4e17-b1bf-1f4616091b4e
                            [role_id] => 8
                            [children] => Array
                                (
                                    [0] => Array
                                        (
                                            [id] => 54c20aba-201c-40ce-b3df-22d516091b4e
                                            [role_id] => 9
                                        )

                                    [1] => Array
                                        (
                                            [id] => 54c20f4b-6e44-40ec-ae22-223a16091b4e
                                            [role_id] => 9
                                        )

                                )

                        )

                    [1] => Array
                        (
                            [id] => 54c1f8bb-ebac-466b-a83f-13a416091b4e
                            [role_id] => 8
                        )

                )

        )

)
</pre>

我需要填充此数组所有ROLE_ID秩序。我试着用递归函数是这样的：

I need to get populate all role_id from this array in order. I tried using recursive function like this:

<?php
public function tree_check($tree){
  $tree_keys = $this->_recursion($tree);
  print_r($tree_keys);
}
public function _recursion($tree){
        foreach ($tree as $n => $v)
        {
            if(isset($v['role_id'])){
               $key_arr[] = $v['role_id']; 
            }
            if (is_array($v))
                $this->_recursion($v);

        }
        return $key_arr;
    }

我期待下面的输出中：

I am expecting the following ouput:

<pre>
Array(
[0]=>2,
[1]=>8,
[2]=>9,
[3]=>9,
[4]=>8
)
</pre>

在这里，我无法达到我的预期输出。阵列的水平可以动态变化，这就是为什么我与递归函数做了。

Here, I cannot achieve my expected output. The level of array may vary dynamically and that is why I have done it with recursive function.

我应该怎样从递归函数返回数组？

How should I return the array from recursive function?

一直以来，我不知道如何深度是我的数组，我怎么能找到最后的键值对数组的？

Since, I don't know how depth is my array, how can I find the last key value pair of array?

推荐答案

您可以使用通过元素的 RecursiveIteratorIterator ：

You can go through the elements using a RecursiveIteratorIterator:

function listRolesRecursive($myArray) {
    $res = array();
    $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($myArray), RecursiveIteratorIterator::SELF_FIRST);
    foreach ($iterator as $k => $v) {
        if($k === "role_id") {
            $res[] = $v;
        }
    }
    return $res;
}

$res = listRolesRecursive($arr);
var_dump($res);

它应该做的伎俩。

It should do the trick.

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