PHP 对无限数组进行排序并保留索引字符串

Question

I want o sort a multidimensional array (which I don't know the length) and keep the index strings. The data of this multidimensional array is from a directory which can have unlimited folders & files.

I have successfully grabbed the folder structure into an array using this List all the files and folders in a Directory with PHP recursive function and I can sort the array with a recursive function like this https://stackoverflow.com/a/4501406/3355243 .

Problem

When sorting, all the array indexs are replaced with numbers. I'd like to keep the array index as strings because it holds the folder name.

Input

Folder A => Array
(
    file.php,
    file1.php,
    Folder B => Array 
    (
        file.php,
        file1.php, 
        Folder A => Array 
        (
            file.php,
            file1.php, 
        )
        something.php
    ),
    something.php
),
Folder B => Array 
(
    other.php,
    other2.php 
),
Folder C => Array 
(
    Folder A => Array 
    (
        a.php,
        b.php
    ),
    something.php
)

Expected output

Folder A => Array
(
    file.php,
    file1.php,
    something.php,
    Folder B => Array 
    (
        file.php,
        file1.php, 
        something.php,
        Folder A => Array 
        (
            file.php,
            file1.php, 
        )       
    ),  
),
Folder B => Array 
(
    other.php,
    other2.php 
),
Folder C => Array 
(
    something.php
    Folder A => Array 
    (
        a.php,
        b.php
    ),  
)

Current output

0 => Array
(
    file.php,
    file1.php,
    something.php,
    0 => Array 
    (
        file.php,
        file1.php, 
        something.php,
        0 => Array 
        (
            file.php,
            file1.php, 
        )       
    ),  
),
1 => Array 
(
    other.php,
    other2.php 
),
2 => Array 
(
    something.php
    0 => Array 
    (
        a.php,
        b.php
    ),  
)

Final goal

To show the array / folder structure into a select box with Groups & Options.

Answer 1

Solved .

The solution of the link Order multidimensional array recursively at each level in PHP uses ksort to order the array and the solution, in my case, I had to use the asort .

https://www.php.net/manual/en/function.asort.php

asort — Sort an array and maintain index association