From: pedropla at holidaymarketing dot com
Operating system: Linux
PHP version: 4.3.3RC4
PHP Bug Type: Scripting Engine problem
Bug description: !is_null($var) does not work the same as $var != NULL
Description:
------------
Since upgrading to php:
PHP 4.3.3RC3 (cli) (built: Aug 16 2003 11:22:58)
Copyright (c) 1997-2003 The PHP Group
Zend Engine v1.3.0, Copyright (c) 1998-2003 Zend
Technologies
it seems that many of my php programs which use !
is_null($var) have broken, however when I replace the
function is_null for a comparison: $var != NULL, it works.
Is this a bug? Or some new "feature"?
Many thanks
Reproduce code:
---------------
Fails:
function name ($setTo=NULL)
{
if (! is_null($setTo))
{
return "Not null";
}
return "null";
}
Works:
function name ($setTo=NULL)
{
if ($setTo != NULL)
{
return "Not null";
}
return "null";
}
Expected result:
----------------
return null when null and not null when not null
Actual result:
--------------
works only with comparison != and not with !is_null()
function
--
Edit bug report at http://bugs.php.net/?id=25137&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=25137&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=25137&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=25137&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=25137&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=25137&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=25137&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=25137&r=support
Expected behavior: http://bugs.php.net/fix.php?id=25137&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=25137&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=25137&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=25137&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=25137&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=25137&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=25137&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=25137&r=gnused
