flatten array tips

gistfile1.txt

function flatten($items)
{
    $result = [];
    foreach ($items as $item) {
        if (is_array($item)) {
            $result = array_merge($result, array_values($item));
            continue;
        }

        $result[] = $item;
    }

    return $result;
}

$item = [1, 2, 3, [4], 5];
var_dump(flatten($item));