Tryout with Friend services

friend-services.php

<?php
// http://3v4l.org/e9RNO

class Foo {
    private $bar = 'hello world';
}

class FriendOfFoo {
    public function doSomething($foo) {
        return function() use ($foo) {
            echo $foo->bar;
        };
    }
}

$foo = new Foo();

$service = new FriendOfFoo();

$closure = $service->doSomething($foo)->bindTo(null, $foo);

$closure();