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Date: Sat, 24 Jan 2015 18:47:19 +0100
Message-ID: <CAF+90c9_-+M9_1iaEVO_kDv3Ho7ATVkZEy0VqHFPrdkD4qK5Gg@mail.gmail.com>
To: Xinchen Hui <laruence@php.net>
Cc: Juan Basso <jrbasso@gmail.com>, PHP Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=047d7b62498c2aa490050d697fe3
Subject: Re: [PHP-DEV] Re: PHP7 Homework for everyone reading this list
From: nikita.ppv@gmail.com (Nikita Popov)

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On Sat, Jan 24, 2015 at 6:40 PM, Xinchen Hui <laruence@php.net> wrote:

> Hey:
>
> On Sun, Jan 25, 2015 at 1:26 AM, Juan Basso <jrbasso@gmail.com> wrote:
> > I step in another failing test that I would like to confirm if that is an
> > issue or it was an accepted backward incompatibility due the phpng (I
> > couldn't find anything on the RFC and the UPGRADING regarding that).
> >
> > Here is the code: http://3v4l.org/h7TEV
> >
> > The issue happens when the variable used to split data using list() is
> also
> > part of the variables that will receive the values. In the case of my
> > example, $data contains the data to be splitted and also will receive the
> > first value.
> >
> > Is that an issue or BC break?
> this is a knew BC break,  please read "Changes to list()" section in
> the AST RFC https://wiki.php.net/rfc/abstract_syntax_tree
>
> thanks
>

We also document this on http://php.net/list:
> Modification of the array during list() execution (e.g. using list($a,
$b) = $b) results in undefined behavior.

If we want, we could make this defined behavior (we would have to disable
CV optimization on the $b fetch). I don't really care personally.

Nikita

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