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To: Dan Ackroyd <danack@basereality.com>, Davey Shafik <davey@php.net>
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Cc: "internals@lists.php.net" <internals@lists.php.net>,
 Sara Golemon <pollita@php.net>
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Date: Wed, 3 Feb 2016 18:06:42 +0100
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Subject: Re: [PHP-DEV] [RFC] Add PHP_ENGINE Constant
From: andreas@heigl.org (Andreas Heigl)

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Am 03.02.16 um 17:54 schrieb Dan Ackroyd:
> On 3 February 2016 at 09:03, Davey Shafik <davey@php.net> wrote:
>> Hi all,
>>
>> It's actually very difficult to be able to reliably determine that you=
 are
>> running the _real_ PHP runtime and not something mimicking it.
>=20
> The underlying problem seems to be caused by HHVM deliberately
> 'faking' the results of calls to zend_version() and the existing
> constants. What is there to stop any other PHP implementations from
> returning 'fake' data for that function or these new constants?
>=20
> And just to play devils advocate, why isn't this a problem that should
> be solved in those other versions of PHP? They're the ones re-using
> version strings and so causing confusion.
>=20
> I can see how this could be useful....I just can't see how this would
> be a permanent solution to the problem. As someone else said, this
> sounds like the old detecting browsers via "user agent headers" for
> browser detection. That became a complete nightmare as browsers kept
> imitating each other, and so the rules about strings became less and
> less useful.
>=20
> Perhaps it might be helpful to justify the RFC, if you can give some
> more context as to why code needs to know about what VM it is running
> on?

Especially when running tests on f.i. Travis-CI you can set an
environment variable to describe what environment you are supposed to be
in.

In all other cases feature-detection (function_exists/extension_loaded
f.i.) should work fine to determine whether the used engine is able to
run a certain function.

And in the end the goal would be to not adapt the code to different
runtine-engines but to adapt the runtime engines to run the code in the
same manner. That's what the language-specification is there for.

My 2 Cent

Cheers

Andreas
>=20
> cheers
> Dan
>=20


--=20
                                                              ,,,
                                                             (o o)
+---------------------------------------------------------ooO-(_)-Ooo-+
| Andreas Heigl                                                       |
| mailto:andreas@heigl.org                  N 50=C2=B022'59.5" E 08=C2=B0=
23'58" |
| http://andreas.heigl.org                       http://hei.gl/wiFKy7 |
+---------------------------------------------------------------------+
| http://hei.gl/root-ca                                               |
+---------------------------------------------------------------------+


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