CODE EXAMPLE FOR PHP

pass array keys to array_map in php

<?php
$arr = [
    'v1' => 'First release',
    'v2' => 'Second release',
    'v3' => 'Third release',
];

// Note: Before 7.4.0, use the longer syntax for anonymous functions instead.
$callback = fn(string $k, string $v): string => "$k was the $v";

$result = array_map($callback, array_keys($arr), array_values($arr));

var_dump($result);
?>