Change array key without changing order

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Tested and works 🙂

function replace_key($array, $old_key, $new_key) {
    $keys = array_keys($array);
    if (false === $index = array_search($old_key, $keys, true)) {
        throw new Exception(sprintf('Key "%s" does not exist', $old_key));
    }
    $keys[$index] = $new_key;
    return array_combine($keys, array_values($array));
}

$array = [ 'a' => '1', 'b' => '2', 'c' => '3' ];    
$new_array = replace_key($array, 'b', 'e');

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