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Date: Sat, 6 Feb 2016 13:11:25 +0700
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To: Sara Golemon <pollita@php.net>
Cc: Davey Shafik <davey@php.net>, PHP internals <internals@lists.php.net>, Matt Prelude <me@mprelu.de>
Content-Type: multipart/alternative; boundary=001a113d2c0679b97f052b13d6fb
Subject: Re: [PHP-DEV] Re: [RFC] Add PHP_ENGINE Constant
From: pierre.php@gmail.com (Pierre Joye)

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On Feb 6, 2016 3:02 AM, "Sara Golemon" <pollita@php.net> wrote:
>
> On Fri, Feb 5, 2016 at 8:20 AM, Pierre Joye <pierre.php@gmail.com> wrote:
> >> I do however like the idea of feature detection - I wonder if perhaps
we
> >> could do something where it's done at compile time and therefore
minimally
> >> impacts runtime?
> >
> > This could be what you actually need. A #ifdef equivalent for PHP. I
> > remember a discussion about adding these features to the core to allow
> > to enable/disable portions of a script at the parsing/compilation
> > level. Doing so allows mixing codes being valid for various
> > implementations inside a same file. It is especially important for
> > features using syntax not compatible with a php.net's PHP
> > specification (for instance).
> >
> This usually results in some half-hearted attempts followed by "just
> use gcc's preprocessor for that". :)

Yeah, preprocessor  (gcc or other) sounds a bit awkward for php while I can
understand why one or the other would like to have it. But still, having
php code cluttered with #ifdef like codes is not very appealing  :)

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