Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:43667
Return-Path: <frozenfire@thefrozenfire.com>
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Delivered-To: mailing list internals@lists.php.net
Received: (qmail 6291 invoked from network); 13 Apr 2009 07:14:12 -0000
Received: from unknown (HELO lists.php.net) (127.0.0.1)
  by localhost with SMTP; 13 Apr 2009 07:14:12 -0000
X-Host-Fingerprint: 66.183.89.177 unknown  
Received: from [66.183.89.177] ([66.183.89.177:6902] helo=localhost.localdomain)
	by pb1.pair.com (ecelerity 2.1.1.9-wez r(12769M)) with ESMTP
	id 8B/71-31755-246E2E94 for <internals@lists.php.net>; Mon, 13 Apr 2009 03:14:11 -0400
Message-ID: <8B.71.31755.246E2E94@pb1.pair.com>
To: internals@lists.php.net
Date: Mon, 13 Apr 2009 00:14:04 -0700
User-Agent: Thunderbird 2.0.0.21 (X11/20090318)
MIME-Version: 1.0
References: <20090412025100.GA5493@klutometis.wikitex.org>
In-Reply-To: <20090412025100.GA5493@klutometis.wikitex.org>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Posted-By: 66.183.89.177
Subject: Re: Closures and __FUNCTION__
From: frozenfire@thefrozenfire.com (Justin Martin)

Hi Peter,

If I recall correctly, you can use the 'use' keyword.

$factorial = function($foo) use ($factorial) {
	$factorial($foo);
}

$factorial('Hello World!');

I'm still having issues compiling 5.3 on my system, so I haven't tested
this.

Thanks,
Justin Martin

Peter Danenberg wrote:
> The original anonymous functions patch[1] contained support for
> __FUNCTION__ as a recursion mechanism in closures, such that I should
> be able to do something like this:
> 
>   $factorial = function($n) {
>       if ($n == 1)
>         return 1;
>       else
>         return $n * call_user_func(__FUNCTION__, $n - 1);                                                                                                          
>     };
> 
>   print $factorial(3);                  // => 6                                                                                                          
> 
> It fails with a warning, though:
> 
>   Warning: call_user_func() expects parameter 1 to be a valid
>   callback, function '{closure}' not found or invalid function name
> 
> Is there another recursion mechanism for closures besides something
> like the $GLOBALS['factorial'] hack?
> 
> Footnotes: 
> [1]  http://marc.info/?l=php-internals&m=119995982228453&w=2
>