From: rdoggett at oz dot net
Operating system: any
PHP version: 5.1.2
PHP Bug Type: Feature/Change Request
Bug description: ternery operator parser improvement
Description:
------------
The ternery operator causes grief because its parsing precedence is
makedly different from other languages, as shown in the attached code.
One could reasonably expect the output to be "1 < 2", and indeed this is
the case when translated to perl, c, or javascript. It is difficult to
believe that php's behavior could be an intentional language feature.
The problem can be solved by inserting nested parenthesis, so the parser's
notion of operator precedence is implicated.
Although changing it to work more like other languages *could* break some
existing php code, this seems very unlikely. It could actually fix some
unfound bugs.
Please, if you don't change the implementation, at least make the manual
explain how the ternery operator's parsing precedence works. (with a big
warning)
Reproduce code:
---------------
<?
$p = 1;
$out = ($p < 2) ? '< 2' :
($p > 4) ? '> 4' :
'= $p';
echo "$p $out\n";
?>
Expected result:
----------------
1 < 2
Actual result:
--------------
1 > 4
--
Edit bug report at http://bugs.php.net/?id=36832&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=36832&r=trysnapshot44
Try a CVS snapshot (PHP 5.1):
http://bugs.php.net/fix.php?id=36832&r=trysnapshot51
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=36832&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=36832&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=36832&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=36832&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=36832&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=36832&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=36832&r=support
Expected behavior: http://bugs.php.net/fix.php?id=36832&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=36832&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=36832&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=36832&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=36832&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=36832&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=36832&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=36832&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=36832&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=36832&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=36832&r=mysqlcfg
