Unexpected output when using array_column with nested arrays in PHP 8.1
I'm converting an old project and I tried several approaches but none seem to work. I'm facing an issue when trying to extract specific values from a nested array using the `array_column` function in PHP 8.1. I have a multi-dimensional array representing a list of products, each with a name and an array of attributes. When I attempt to pull out the 'color' attributes using `array_column`, I'm not getting the expected results. Here's the structure of my array: ```php $products = [ [ 'name' => 'Product A', 'attributes' => [ ['color' => 'red'], ['size' => 'M'] ] ], [ 'name' => 'Product B', 'attributes' => [ ['color' => 'blue'], ['size' => 'L'] ] ] ]; ``` When I run the following code to extract the 'color' attributes: ```php $colors = array_column($products, 'attributes.color'); ``` I'm getting an unexpected result, specifically `[]` instead of an array of colors. I have also tried using a combination of `array_map` like this: ```php $colors = array_map(function($product) { return array_column($product['attributes'], 'color'); }, $products); ``` But this also doesn't give me the flat array of colors I need. Instead, it returns a nested array like this: ```php [["red"], ["blue"]] ``` What am I missing here? I was hoping to get a simple array like `['red', 'blue']`. I've checked the PHP documentation, and it seems `array_column` should work for this, but I suspect it might not handle nested arrays in the way I expect. Any help would be appreciated! Is there a better approach? Has anyone dealt with something similar?