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Date: Thu, 27 Jun 2013 17:08:45 +0200
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To: Florin Patan <florinpatan@gmail.com>
Cc: "internals@lists.php.net" <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Bug 52355
From: nikita.ppv@gmail.com (Nikita Popov)

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On Thu, Jun 27, 2013 at 2:42 PM, Florin Patan <florinpatan@gmail.com> wrote:

> Hello,
>
>
> I'd like to start working on a bug,
> https://bugs.php.net/bug.php?id=52355 but I'm not sure where to start
> investigating exactly.
> I've compared the 5.2.2 and 5.2.3 changes and there's nothing that
> jumps into my eyes.
> Could I get some pointers on how to start working on debugging this
> and how to eventually fix it?
> Also, while I'll fix this I plan to write an article about starting
> from scratch and document every step in order to identify where the
> bug is located and how to test/fix it so that others could use this
> information.
> Thanks.
>

Here is the implementation of the unary minus operator:
http://lxr.php.net/xref/PHP_TRUNK/Zend/zend_language_parser.y#776
As you can see -a is translated to 0 - a.

In this particular case -0 is translated to 0 - 0, which is 0, not -0.

Hope this helps,
Nikita

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