ID: 12566
Updated by: jeroen
Reported By: [EMAIL PROTECTED]
Status: Open
Bug Type: *Programming Data Structures
Operating System: Linux
PHP Version: 4.0.6
New Comment:
[EMAIL PROTECTED]:
> It's not a "bug," but a "feature." :)
>
> PHP has the inverse associativity of ?: compared to C (and every other
> language). This was originally a mistake, but now "it won't be changed,"
> due to historical reasons.
>
> See some messages I had on php-dev back around the first week of January,
> 2001 on this topic. FWIW, I would like to change it.
>
> -adam
So, you need to read it as:
echo (TRUE ? 'one' : TRUE) ? 'two' : 'unknown';,
and
echo 'one' ? 'two' : 'unknown' is, correctly, 'two'
Maybe a fix for PHP 4.1 / PHP 5?
Previous Comments:
------------------------------------------------------------------------
[2001-08-04 17:04:43] [EMAIL PROTECTED]
Confirmed in latest CVS:
---
echo TRUE ? 'one' : TRUE ? 'two' : 'unknown';
=> two
---
echo TRUE ? 'one' : FALSE ? 'two' : 'unknown';
=> two
---
This definitely is a bug, and IMO a serious one. A parse error would be acceptable IMO
(then use ( and )), but this isn't.
------------------------------------------------------------------------
[2001-08-04 15:33:28] [EMAIL PROTECTED]
The following emits 'two' rather than 'one' as one would expect.
$a = 1; $b = 2;
echo (($a == 1) ? 'one' :
($b == 2) ? 'two' :
'unknown');
Apologies if for PHP this unusual behaviour actually is as expected, but being
counter-intuituve, and of course inconsistent from other languages with a ?: operator,
this is an undesirable result.
In 'C', the following of course outputs 'one'
#include <stdio.h>
int main()
{
int a = 1, b = 2;
puts((a == 1) ? "one" :
(b == 2) ? "two" :
"unknown");
return 0;
}
------------------------------------------------------------------------
Edit this bug report at http://bugs.php.net/?id=12566&edit=1
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