remove the extension from the key - php

Question

How to remove the extension from the array key, ie .md.
It should look like this key: [about] => pages/about.md
Array:
Array:
(
[_desktop.md] => pages/_desktop.md
[about.md] => pages/about.md
[contact.md] => pages/contact.md
[errorpages] => Array
(
[403.md] => pages/errorpages/403.md
[404.md] => pages/errorpages/404.md
[500.md] => pages/errorpages/500.md
[503.md] => pages/errorpages/503.md
)
[home.md] => pages/home.md
[indexpage.md] => pages/indexpage.md
)
Code:
function generatePathTree($dir) {
$pathstack = array($dir);
$contentsroot = array();
$contents = &$contentsroot;
while ($path = array_pop($pathstack)) {
$contents[basename($path)] = array();
$contents = &$contents[basename($path)];
foreach (scandir($path) as $filename) {
if ('.' != substr($filename, 0, 1)) {
$newPath = $path.'/'.$filename;
if (is_dir($newPath)) {
array_push($pathstack, $newPath);
$contents[basename($newPath)] = array();
} else {
$contents[basename($filename)] = $newPath;
}
}
$contentsroot = preg_replace("/\\.[^.]*$/", "", basename($filename));
}
}
return $contentsroot[basename($dir)];
}
I tried so:
$contentsroot = preg_replace("/\\.[^.]*$/", "", basename($filename));
But alas.
How to do?

Answer 1

In this code block (This is where filename gets assigned instead of dir):
else {
$fileExtRemoved = preg_replace("/[\.](.*)/", "", $filename);
$contents[basename($fileExtRemoved)] = $newPath;
}
Your regexp is a little bit off, this is the correct one:
https://3v4l.org/mMPrt

Answer 2

You can assigne the old value to new key and then unset the old key
$arr['about'] = $arr['about.md'];
unset($arr['about.md']);

Answer 3

It's three characters on all of them?
So why not just use sub_str($key , 0, -3);?
If it's always three chars it should work, and as I see it, it seems to be three.
So maybe:
$contents[basename(substr($filename,0,-3))];

Answer 4

Requirement: remove any part of the array key string after the first . if it exists in the string.
Solution:
list($key,) = explode('.', $old_key);
$arr[$key] = $arr[$old_key];
unset($arr[$old_key]);
A side note: there must be a better way to do the recursive loop. But a quick look suggests that array_walk_recursive only operates on the leaf nodes; array_map and array_reduce don't have recursive variants and they only take values anyway. Since you didn't explicitly ask for this, I'll stop there.