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Reply-To: <francois@php.net>
To: "'Yasuo Ohgaki'" <yohgaki@ohgaki.net>
Cc: "'Alain Williams'" <addw@phcomp.co.uk>,
	<internals@lists.php.net>
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Date: Wed, 25 Feb 2015 06:37:34 +0100
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Subject: RE: [PHP-DEV] [Discussion] Last chance for case-sensitive engine
From: francois@php.net (=?utf-8?Q?Fran=C3=A7ois_Laupretre?=)

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Hi,

=20

The most important point, IMO, is that it will be extremely complex to =
provide a =E2=80=98deprecated=E2=80=99 transition step.

=20

I won=E2=80=99t have time to work on it during the next month (will be =
in Africa starting next Saturday). So feel free to take over the RFC and =
propose something for the future.

=20

Regards

=20

Fran=C3=A7ois

=20

De : yohgaki@gmail.com [mailto:yohgaki@gmail.com] De la part de Yasuo =
Ohgaki
Envoy=C3=A9 : mercredi 25 f=C3=A9vrier 2015 03:07
=C3=80 : francois
Cc : Alain Williams; internals@lists.php.net
Objet : Re: [PHP-DEV] [Discussion] Last chance for case-sensitive engine

=20

Hi Francois,

On Wed, Feb 25, 2015 at 8:45 AM, Fran=C3=A7ois Laupretre =
<francois@php.net> wrote:
>
> I stopped for several reasons :
>
> 1. The reactions were mostly negative, with a majority of 'breaks =
much,
> brings nothing' opinions,
>
> 2. Crawling through the code, I discovered that code to handle case
> insensitivity was spread all around PHP. Example: I thought that =
function
> and method names could be made case-sensitive by modifying a limited =
number
> of lines of code. Actually, it seems it is handled in a more or less
> redundant way in a lot of locations. So, I quickly realized that
> implementation would be extremely complex.
>
> 3. A lot of PHP code is, knowingly or not, using PHP case =
insensitivity.
>
> 4. A patch to make PHP case sensitive would be very complex, and =
providing a
> two-mode mechanism still much more. It would require in many cases to
> provide another case-sensitive test after each case-insensitive one =
and
> raise an error if both don't match. We must do that because =
case-insensitive
> comparisons are done using a case-sensitive comparison of two strings
> previously converted to lowercase. It would also require to store =
every
> class/function/method names twice, as they are currently stored in =
lowercase
> form. As lowercase names are transmitted as strings around the code, =
it is
> very complex to keep the link with the original value. So, to =
summarize, I
> now consider that providing a compatibility 'notice-only' mode is
> practically impossible.
>
> So, while it seemed attractive at first, I stopped working on it.


Sounds reasonable.=20
Zend does comparison/conversion various places indeed. "Propose=20
& announce it now,  then implement it PHP8" may work. We may get a=20
little simpler Engine for PHP8.

Regards,

--
Yasuo Ohgaki
yohgaki@ohgaki.net


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