从一组对象中获取某种类型的元素

I have a array of objects like this one:

Array
(
    [0] => stdClass Object
        (
            [art_id] => 76
            [title] => whatever
        )

    [1] => stdClass Object
        (
            [art_id] => 216
            [title] => blabla
        )

)

Can I somehow get a array with all art_id's from it, without having to iterate it?

(like array(76, 216))

function getArtId($obj)
{
    return $obj->art_id;
}

$b = array_map("getArtId", $a);
print_r($b);

This is indirectly an iteration, but you do not need to write code for the loop yourself.