just to add that "," (comma) is not working in ternary operator :/
( posted an example for that but forgot to specify the problem)
Andrey
----- Original Message -----
From: "Marcus Börger" <[EMAIL PROTECTED]>
To: "Derick Rethans" <[EMAIL PROTECTED]>
Cc: "Andrey Hristov" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Wednesday, March 12, 2003 8:35 PM
Subject: Re: [PHP-DEV] Possible problem in the parser
> At 18:42 12.03.2003, Derick Rethans wrote:
> >On Wed, 12 Mar 2003, Andrey Hristov wrote:
> >
> > > Few minutes ago I found the following behaviour somehow wierd for me
:
> > > <?php
> > > $a = 1;
> > > $b = $a==1? 4:$a==2? 5:6;
> > > printf("a[%d]b[%d]\n", $a, $b);
> > > ?>
> > > Prints :
> > > a[1]b[5]
> > >
> > > Similar C program :
> > > main()
> > > {
> > > int a,b;
> > > a = 1;
> > > b = a==1? 4:a==2? 5:6;
> > > printf("a[%d]b[%d]\n", a, b);
> > > }
> > > Prints :
> > > a[1]b[4]
> > >
> > > -=-=-=-=-=-
> > > I think that the behavior of the C program is the right
> >
> >It's just a different operator precedence; it's not really wrong, just
> >different.
>
>
> Where is the different precednece here? I can only find an error.
> Lets support parantesis:
>
> ALL BUT PHP) '==' has higher precedence than '?:'
>
> ((a==1) ? 4 : ((a==2) ? 5 : 6)) => (1) ? 4 : ((0) ? 5 : 6) => 1 ? 4 : 6
=> 4
>
> PHP?) '?:' has higher precedence than '=='
>
> (a == (1 ? 4 : a) == (2 ? 5 : 6))
>
> ( a == (4) == (5))
>
> Now what? Assume order left from to right: ( (a == (4)) == (5) => (0 == 5)
=> 0
>
> Or right to left (which contradicts rest of PHP behavior): ( a == ((4) ==
> (5))) => (a == 0) => 0
>
> Result: This is (to say it in german "mumpitz") wrong.
>
> So lets fix it.
>
> marcus
>
>
>
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