👀 Views: 199 💬 Answers: 1 📅 Created: 2025-06-01

php array array_filter PHP

I'm trying to debug I'm getting frustrated with I'm working with a strange scenario with the `array_filter` function in PHP 8.1 when I pass a callable to filter an associative array. The keys are not being preserved as I expected. My input array looks like this: ```php $data = [ 'apple' => 1, 'banana' => 2, 'cherry' => 3, 'date' => 0, ]; ``` I want to filter out the elements that are greater than 1. I used the following code: ```php $result = array_filter($data, function($value) { return $value > 1; }); ``` However, when I print the result: ```php print_r($result); ``` I get: ``` Array ( [1] => 2 [2] => 3 ) ``` Notice that the keys are not preserved. I had expected the output to maintain the original keys, which would result in: ``` Array ( [banana] => 2 [cherry] => 3 ) ``` I've tried using the `ARRAY_FILTER_USE_BOTH` flag, but it seems to not work as I anticipated: ```php $result = array_filter($data, function($value, $key) { return $value > 1; }, ARRAY_FILTER_USE_BOTH); ``` This still results in a similar output. The documentation states that the keys should be preserved, so I'm not sure where I'm going wrong. Can anyone explain why this is happening or suggest a workaround to keep the original keys? I'm running PHP 8.1.0, and I've checked that there are no errors in my code. Any insights would be appreciated! Any ideas what could be causing this? I'm open to any suggestions. This is my first time working with Php 3.11. Any ideas what could be causing this?