PHP数组树阵 [英] PHP array to tree array

问题描述

我有一个问题，我无法修复。我有2个数组和字符串。第一个数组包含第二个应该使用的键。第一个是这样的：

I have a problem I cannot fix. I have 2 arrays and a string. The first array contains the keys the second one should use. The first one is like this:

Array
(
    [0] => foo
    [1] => bar
    [2] => hello
)

现在我需要一个PHP code，它转换为第二个数组：

Now I need a PHP code that converts it to the second array:

Array
(
    [foo] => Array
        (
            [bar] => Array
                (
                    [hello] => MyString
                )
        )
)

项的数目是可变的。

The number of items is variable.

有人可以告诉我如何做到这一点？

Can someone please tell me how to do this?

推荐答案

您应该使用引用来解决这个问题：

You should use references to solve this problem:

$a = array (0 => 'foo', 1 => 'bar', 2 => 'hello' );

$b = array();
$ptr = &$b;
foreach ($a as $val) {
    $ptr[$val] = Array();
    $ptr = &$ptr[$val];
}
$ptr = 'MyString';
var_dump($b);

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