// Created on savesnippets.com · https://savesnippets.com/3bkyIadLzYTQJr
<?php
function pluck(array $rows, string $col, ?string $indexBy = null): array {
    return array_column($rows, $col, $indexBy);
}

$users = [
    ['id'=>1,'name'=>'Alice'],
    ['id'=>2,'name'=>'Bob'],
    ['id'=>3,'name'=>'Cara'],
];

print_r(pluck($users, 'name'));         // [Alice, Bob, Cara]
print_r(pluck($users, 'name', 'id'));   // [1=>Alice, 2=>Bob, 3=>Cara]