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php-developer-list | 2002112

[PHP-DEV] Re: [Zend Engine 2] RFC: Conversion patch From: Andi Gutmans (andi <email protected>)
Date: 11/27/02

At 04:41 PM 11/26/2002 -0500, Daniel Cowgill wrote:
>So why do the conversion in arithmetic? This seems bizarrely inconsistent to
>me:
>
><?
>print (int) "0xA" + 0; // prints 0
>print (int) ("0xA" + 0); // prints 10
>?>
>
>I think it's reasonable to expect those expressions to return the same value.
>

Hmm, this is definitely interesting. The result of the second expression
should be 0 too. I haven't had time to check why this happens as all
conversions in zend_operators.c are with base 10. I vaguely remember
someone changing something in this area a while ago.
BTW in PHP 4.0.4 this prints out "1" (the second expression) which doesn't
make much sense.
The reason for this is that is_numeric_string() which is used in
add_function() does convert hexadecimals whereas all other code in
zend_operators.c doesn't.
This is a pretty bad inconsistency which should be addressed.
Andi

>On Tue, 26 Nov 2002, Andi Gutmans wrote:
>
> > http://marc.theaimsgroup.com/?l=php-dev&m=90279104406264&w=2
> >
> > There's more...
> >
> > Andi
> >
> > At 10:21 PM 11/26/2002 +0100, Derick Rethans wrote:
> > >On Tue, 26 Nov 2002, Andi Gutmans wrote:
> > >
> > > > I remember having a long conversation on this issue quite a long
> time ago.
> > > > I think it was on php-dev. The bottom line was that we only want
> > > conversion
> > > > in the scanner and not within PHP.
> > >
> > >Too bad, because the following thing is totally uninituitive:
> > >
> > >echo (int)"0x200";
> > >
> > >(prints "0")
> > >
> > >And I searched for a discussion on this, but couldnt' find it. I wonder
> > >why it was decided to be like this.
> > >
> > >Derick
> > >
> > >--
> > >
> > >-------------------------------------------------------------------------
> > > Derick Rethans http://derickrethans.nl/
> > > JDI Media Solutions http://www.jdimedia.nl/
> > > PHP Magazine - PHP Magazine for Professionals http://php-mag.net/
> > >-------------------------------------------------------------------------
> >
> > 

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