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[PATCH] 'const' in global scope

php.internals

Chris Vandomelen

23 years ago

In tune with the current 'const' patches by Sterling, and because I found
it useful (and more consistent than the original behaviour IMHO), attached
is a patch which implements compile-time constants in the global scope:

<?php

const something = 2, something_else = 4;

?>

The behaviour is the same as define(), only implemented in the compiler
instead of as a function.

Chris

Sterling Hughes

23 years ago

On Tue, 2003-04-08 at 15:44, Chris Vandomelen wrote:

> In tune with the current 'const' patches by Sterling, and because I found
> it useful (and more consistent than the original behaviour IMHO), attached
> is a patch which implements compile-time constants in the global scope:
>
> <?php
>
> const something = 2, something_else = 4;
>
> ?>
>
> The behaviour is the same as define(), only implemented in the compiler
> instead of as a function.
>

You'll want to use static_scalar_expr when applied with my patch.

-Sterling

> Chris
>
> ______________________________________________________________________
>
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Chris Vandomelen

23 years ago

> You'll want to use static_scalar_expr when applied with my patch.
>
> -Sterling

*nod* I haven't applied your patch yet (I've already got a fairly hacked
up ZE2 build as it stands, having taken the time to implement features to
allow objects to be casted to any primitive type (convert_to_*()) and
allow overloading of the equality operator... ugly hacks. :)

Chris

John Coggeshall

23 years ago

I've been thinking about this for awhile, and seeing these patches about
'const' at compile-time I thought I would throw this in here now...

Instead of patching the engine for these constant values, wouldn't these
things be better served in a module? I've already worked on a basic
module that hooks into zend_compile() and does pre-processing before
giving the script over to PHP... Hence you'd have something identical to
C's preprocessing.

<?php

#define MYVAR 1;

Echo MYVAR;

?>

If there is interest, I'd like to be able to include this module in PHP5
once its been cleaned up...

John


-~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~-
John Coggeshall
john at coggeshall dot org                  http://www.coggeshall.org/
-~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~--~=~-

George Schlossnagle

23 years ago

On Tuesday, April 8, 2003, at 05:33  PM, John Coggeshall wrote:

>
> I've been thinking about this for awhile, and seeing these patches
> about
> 'const' at compile-time I thought I would throw this in here now...
>
> Instead of patching the engine for these constant values, wouldn't
> these
> things be better served in a module?

Preprocessing aside (and I think something more akin to Perl's Filter
support would be ideal), constant folding is nice and belongs in the
engine.