From: ensnnet at gmail dot com
Operating system: windows xp sp3
PHP version: 5.2.6
PHP Bug Type: Unknown/Other Function
Bug description: Bad result in an expression evaluation
Description:
------------
A simple logical expression is bad evaluated. Next code show that.
Reproduce code:
---------------
<?php
$emma = "A";
$lobera = 0;
echo "[ The right answer is: Flag is off ]<br><br>";
// This run bad:
$flag = $emma=="A" and $lobera!=0;
evaluate($flag);
// This run well (why?):
$flag = ($emma=="A" and $lobera!=0);
evaluate($flag);
// This run well too:
$flag = $lobera!=0 and $emma=="A";
evaluate($flag);
// ============================================================
function evaluate($flag)
{
if($flag)
echo "Flag is on<br>";
else
echo "Flag is off<br>";
}
?>
Expected result:
----------------
[ The right answer is: Flag is off ]
Flag is off
Flag is off
Flag is off
Actual result:
--------------
[ The right answer is: Flag is off ]
Flag is on <--- This is bad
Flag is off
Flag is off
--
Edit bug report at http://bugs.php.net/?id=45410&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=45410&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=45410&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=45410&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45410&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=45410&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45410&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45410&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45410&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45410&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45410&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=45410&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=45410&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45410&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45410&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45410&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45410&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45410&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45410&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45410&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45410&r=mysqlcfg
