note 102706 rejected from functions.anonymous by danbrown

Note Submitter: Parad0X dot UA at gmail dot com 

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Anyone knows of a better way to access $this from an anonymous function?
I'm currently using the following approach:

class Hello
{
    public function world()
    {
        $array = array(1,2,3);
        $that = $this;
        return array_map(function($entry) use ($that) {
            return $that->foo($entry);
        });
    }

    public function foo($in) 
    {
        return $out;
    }
}

$hello = new Hello;
$hello->world();

Seems like a hack but works.