更多声明性PHP：数组转换

I have an array of class objects:

class Foo
{
    public $A;
    public $B;
    public $C;
}

I need a new array of C fields. Is there a way to convert the array without explicit loops? Hate that after C#.

// Explicit conversion:
foreach ($arr as $item)
{
    $Cs[] = $item->C;
}

Regards,

$Cs = array_map(function($item) {
    return $item->C;
}, $arr);

I believe you can use get_object_vars.

$arr = get_object_vars(new Foo());
var_dump($arr); // should give Array(3) { "A"=>NULL, "B"=>NULL, "C"=>NULL }