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Date: Wed, 19 May 2010 12:04:20 +0100
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To: Tjerk Anne Meesters <datibbaw@php.net>
Cc: Frederic Hardy <frederic.hardy@mageekbox.net>, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Constant and expression ?
From: rquadling@googlemail.com (Richard Quadling)

On 19 May 2010 11:21, Tjerk Anne Meesters <datibbaw@php.net> wrote:
> On Wed, May 19, 2010 at 5:52 PM, Frederic Hardy
> <frederic.hardy@mageekbox.net> wrote:
>> Hello !
>>>
>>> AFAIK class constants are optimized for speed and therefore don't
>>> support expressions; don't expect this to change any time soon ;-)
>>>
>>>> Is there any feature request about constant and expression ?
>>>> I would like to write something like that :
>>>>
>>>> <?php
>>>>
>>>> namespace foo\bar\directories {
>>>> =C2=A0 =C2=A0const tmp =3D __DIR__ . '/tmp';
>>>> }
>>>>
>>>> ?>
>>
>> So the best solution is something like <?php
>> define('foo\bar\directories\tmp', __DIR__ . '/tmp'); ?>...
>> It 's strange that "define()" function can do something that the "const"
>> =C2=A0keyword can't do, even if "const" keyword evaluation is done at co=
mpilation
>> time and "define()" evaluation is done at runtime.
>
> That's why there's a cost penalty to using define().
>
> I wrote a small article that gives an idea of the speed differences:
> http://shwup.blogspot.com/2010/04/about-constants.html
>
>
>>
>> Best regards,
>> Fred.
>>
>> --
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> Fr=C3=A9d=C3=A9ric Hardy : Architecte d'application/Admin. syst=C3=A8me/=
Ergonome
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0Status : En recherche d'emploi
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>
>>
>
>
>
> --
> --
> Tjerk

With regard to HiDef and the hidef.ini_path setting, and the comment
on [1] regarding "However, all this goodness comes with a drawback:
configuration settings are instance wide, which impacts all setups of
PHP that runs beyond a single web request (e.g. Apache module or
FastCGI).", could the ini entry be placed in a ...

[HOST=3D]

section in the ini file? [2]

If so, could this be the best solution?

Regards,

Richard.

[1] http://shwup.blogspot.com/2010/04/about-constants.html
[2] http://docs.php.net/manual/en/ini.sections.php

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Richard Quadling
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