Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:8353
Return-Path: <truth@proposaltech.com>
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Delivered-To: mailing list internals@lists.php.net
Received: (qmail 29055 invoked by uid 1010); 3 Mar 2004 20:21:08 -0000
Delivered-To: ezmlm-scan-internals@lists.php.net
Delivered-To: ezmlm-internals@lists.php.net
Received: (qmail 29026 invoked from network); 3 Mar 2004 20:21:07 -0000
Received: from unknown (HELO fed1mtao05.cox.net) (68.6.19.126)
  by pb1.pair.com with SMTP; 3 Mar 2004 20:21:07 -0000
Received: from notebook.local ([68.111.229.228]) by fed1mtao05.cox.net
          (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP
          id <20040303202106.HTSB8957.fed1mtao05.cox.net@notebook.local>;
          Wed, 3 Mar 2004 15:21:06 -0500
Reply-To: truth@proposaltech.com
To: Adam Bregenzer <adam@bregenzer.net>
Cc: internals@lists.php.net
In-Reply-To: <1078305931.6596.38.camel@arcon_server>
References: <1078278552.17703.234.camel@notebook.local>
	 <1078305931.6596.38.camel@arcon_server>
Content-Type: text/plain
Message-ID: <1078345266.2491.18.camel@notebook.local>
Mime-Version: 1.0
X-Mailer: Ximian Evolution 1.4.5 
Date: Wed, 03 Mar 2004 12:21:07 -0800
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] Adding a few debug helpers to php4.x
From: truth@proposaltech.com (Todd Ruth)

Thanks for the replies.

First, in response to Stefan...

> et@edea:~$ php -r '$a = 2; $b = $a; debug_zval_dump($a);'
> long(2) refcount(3)
> et@edea:~$ 

I missed that one.  Thanks!  With that I'd at least be
able to implement ref_count in php.

And then in response to Adam...
> > ============ (dis)allow_copies(mixed var) ============
> 
> What about implementing this directly in php?  You could use
> trigger_error in the constructor to stop the script from executing if
> the object is instantiated more than once.

I'll end up doing both.  I'll do what you've mentioned to
get an error from the following code:

$s1 = new Singleton();  // Constructor sets non-member var to true
$s2 = new Singleton();  // The constructor will fail

I need disallow_copies() also though in order to get an error
from the following code:

$s1 = new Singleton();  // constructor calls disallow_copies($this)
$s2 = $s1;  // With php4 I get a copy without any function call

or the following code:

function f($server) {   // Bug!  Should have been &$server
	...
}
$s1 = new Singleton();  // constructor calls disallow_copies($this)
f($s1);  // With php4 I get a copy without any function call

Finding those bugs when you have tens of thousands of lines of
php can be a real headache.  That's why I'd very much like
a disallow_copies function.


Is anyone familiar with the extent of the uninitialized
struct issue I faced with the implemention I posted
yesterday?  

Thanks again,
Todd