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Date: Wed, 24 Aug 2005 00:58:58 -0400
To: Zeev Suraski <zeev@zend.com>
Cc: Stanislav Malyshev <stas@zend.com>, Marcus Boerger <helly@php.net>, 
	internals@lists.php.net
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Subject: Re: [PHP-DEV] Re: PHP 6.0 Wishlist
From: michael.walter@gmail.com (Michael Walter)

Zeev,

On 8/23/05, Zeev Suraski <zeev@zend.com> wrote:
> >"Real" anonymous functions (as in, closures) should be able to capture
> >variables from its lexical environment, e.g.:
>=20
> create_function() accepts a string, and that string is constructed with
> full access to the lexical scope of the creating function, so I'm not
> exactly sure how it's different.  My ML/LISP memory fails me.

It certainly does not appear to be that way in PHP 4, in the
supposedly equivalent snippet:

  function adder($a) {return create_function('$b', 'return $a+$b;');}

..$a is not accessible from inside the anonymous function. This is the
reason Stanislav put the content of $a into the code string (and
probably the reason he chose adder() instead of index() for his
"counter-example" ;).

> Since when do we consider moving towards LISP a good thing? :)

FWIW, I'm merely explaining the problem, not giving any opinion (too
afraid of Derick ;).

Cheers,
Michael

PS: Common Lisps get the garbage collection right, though! ;)