PHP 8.2 - implementing using array_reduce to aggregate data from a multidimensional array
After trying multiple solutions online, I still can't figure this out. Hey everyone, I'm running into an issue that's driving me crazy... I've searched everywhere and can't find a clear answer. I'm trying to aggregate data from a multidimensional array of orders in PHP 8.2. Specifically, I want to sum the total amounts for each product based on the orders, but I keep running into issues with my `array_reduce` usage. Here's the structure of the input array: ```php $orders = [ ['product' => 'A', 'amount' => 10], ['product' => 'B', 'amount' => 20], ['product' => 'A', 'amount' => 30], ['product' => 'C', 'amount' => 40], ['product' => 'B', 'amount' => 10], ]; ``` I want the final output to look like this: ```php [ 'A' => 40, 'B' => 30, 'C' => 40, ] ``` I've attempted the following code: ```php $result = array_reduce($orders, function ($carry, $item) { if (isset($carry[$item['product']])) { $carry[$item['product']] += $item['amount']; } else { $carry[$item['product']] = $item['amount']; } return $carry; }, []); ``` However, when I run it, I'm getting the following empty array: ```php print_r($result); // Output: [] ``` I've double-checked the array structure and the indexing, and everything seems correct. I suspect it might be related to how I'm initializing the `$carry` variable or something subtle I'm missing in the closure. Any insights into what I'm doing wrong or how to properly configure `array_reduce` for this aggregation? Thanks in advance! My development environment is Linux. Has anyone else encountered this? This is part of a larger application I'm building. Thanks in advance! My team is using Php for this microservice. How would you solve this? Is there a simpler solution I'm overlooking?