PHP - Create unlimited depth array [duplicate] - php

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PHP, regex and multi-level dashes and grouping together according to string occurrence
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I have to build sitemap.html generator, that creates a tree of URLs.
So for instance if I have those URLs:
https://some.url/with/something/good/ and https://some.url/with/something/bad/
it will create something like this:
- https://some.url/
- https://some.url/with/
- https://some.url/with/something/
- https://some.url/with/something/good/
- https://some.url/with/something/bad/
I have array of every URL from my site, now I was thinking of building multidimensional array.
Example above would be converted to something like this:
$url_structure['https://some.url/']['https://some.url/with/']['https://some.url/with/something/']['https://some.url/with/something/good/'] = 0;
Which will look like this:
Array
(
[https://some.url/] => Array
(
[https://some.url/with/] => Array
(
[https://some.url/with/something/] => Array
(
[https://some.url/with/something/good/] => 0
[https://some.url/with/something/bad/] => 0
)
)
)
)
Have you got an idea how to do that better? That's the only solution I have in mind so far.
Problem is I can't find the way to create something like this, because I don't really know how depth this array will become. I just have array of URLs (around 20k URLs).
Output to sitemap.html is a list that I did above.

Answer 1

You can use a reference variable to do the job in such way
$list = [
'https://some.url/with/something/good/',
'https://some.url/with/something/bad/',
];
$res = [];
foreach ($list as $x) {
// remove root. you can add it after loop.
$x = substr($x, strlen('https://some.url/'));
$path = preg_split('~/+~', trim($x, '/'));
// point to the array
$p = &$res;
foreach($path as $step) {
if(! isset($p[$step])) {
// add next level if it's absent
$p[$step] = [];
}
// go to next level
$p = &$p[$step];
}
}
demo