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Date: Thu, 14 Aug 2014 12:35:53 +0200
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To: Alain Williams <addw@phcomp.co.uk>
X-Mailer: Apple Mail (2.1878.6)
Subject: Re: [PHP-DEV] [RFC] Introduce Abstract Syntax Tree
From: mike.php.net@gmail.com (Michael Wallner)


On 14 08 2014, at 11:33, Alain Williams <addw@phcomp.co.uk> wrote:

> On Thu, Aug 14, 2014 at 10:25:11AM +0100, Chris Wright wrote:
>=20
>>> My personal opinion is that things like $a[$i++] =3D $i++ have zero =
practical
>>> relevance (and also think that anyone using something like this =
deserves
>>> any breakage he gets). I'd rather save some lines of code than =
maintain any
>>> behavior guarantees for that. But some people have contrary opinions =
on
>>> this, so I'm bringing up the point for discussion.
>>=20
>> +1. It's documented as undefined behaviour, doing it in the first
>> place is highly non-obvious to the reader with a clear ambiguity, =
it's
>> fine by me to break from the current behaviour.
>=20
> +1
>=20
> It is OK to define some things as undefined and have them break =
between releases -
> even minor releases. I always teach it as undefined - as it is in most
> programming languages.
>=20
> Likewise, if the next 2 characters on input are 'a' then 'b' what gets =
assigned
> could either be 'ab' or 'ba':
>=20
>    $TwoChars =3D fgetc($in) . fgetc($in);
>=20
> Some code is just broken.

Wat? No. This is totally different to two in/decrements on one line. =
This has to be executed in order.

Cheers,
Mike