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Date: Mon, 19 Jan 2009 09:05:12 -0800
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To: Marcus Boerger <helly@php.net>
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Subject: Re: [PHP-DEV] [RFC] prototyping
From: stas@zend.com (Stanislav Malyshev)

Hi!

> class Foo {
>   private $myVeryOwnData;
>   function bla {
>     $this->bigMEss = function () { return $this->myVeryOwnData; }
>   }
> }

This is not a "mess" - this is *exactly* what closures are for. If you 
don't want this function to be able to access private variables - do not 
put code that accesses private variables there! That's like saying this 
code is a "mess":

class Foo {
   private $myVeryOwnData;
   public function getData() {
     return $this->myVeryOwnData;
   }
}

because you can do this:

$a = new Foo();
echo $a->getData();

Oh horror!! It accessed private data!! Because you explicitly told it to 
access it, yes. What did you expect if you provide public method to 
access private data?

>     // I am very sorry but I would expect the closure to rebind $this as
>     // $this always points to the bound object. And how is this different?

I am very sorry but your expectation is wrong. There's no reason for 
closures to magically rebind, and if some particular language, due to 
limitations of its design, has this weird WTF inside, it's a problem 
that we don't have to carry on into PHP. If you created a closure, you 
got context. That's the whole point of closure. $this is part of the 
context. If for some reason you need WTF-closures that keep half of the 
context from where they were created and half from where they were 
called, you may create it, but regular closures shouldn't do that.
-- 
Stanislav Malyshev, Zend Software Architect
stas@zend.com   http://www.zend.com/
(408)253-8829   MSN: stas@zend.com