PHP 8.1 Issue with Filtering Multi-dimensional Arrays Using array_walk Recursive Function
I'm prototyping a solution and I'm dealing with I'm experiencing unexpected behavior when trying to filter a multi-dimensional array in PHP 8.1 using `array_walk()`... My intent is to remove any entries with an empty `name` key from a list of user data that looks like this: ```php $users = [ ['id' => 1, 'name' => 'Alice'], ['id' => 2, 'name' => ''], ['id' => 3, 'name' => 'Bob'], ['id' => 4, 'name' => null], ['id' => 5, 'name' => 'Charlie'], ]; ``` I wrote the following code: ```php $result = []; array_walk($users, function($user) use (&$result) { if (!empty($user['name'])) { $result[] = $user; } }); ``` However, I'm finding that the `$result` array contains entries with `null` names, which I didn't expect. The `$result` should ideally contain only users with non-empty names. When I dump the `$result`, I see: ```php Array ( [0] => Array ( [id] => 1 [name] => Alice ) [1] => Array ( [id] => 3 [name] => Bob ) [2] => Array ( [id] => 5 [name] => Charlie ) ) ``` To troubleshoot, I tried using `var_dump` inside the callback function to check the value of `$user['name']`. It correctly showed an empty string for user ID 2 and `null` for user ID 4. I also experimented with using `array_filter()`, but that doesn't fit my use case since I need to modify the original structure while filtering. Would anyone know why `array_walk()` is allowing `null` values through, or if there's a better approach to achieve the desired filtering without losing the array structure? For context: I'm using Php on Ubuntu 22.04. What's the best practice here? Any help would be greatly appreciated! This is my first time working with Php LTS.