From: kjohnson at zootweb dot com
Operating system: Linux
PHP version: 4.3.2
PHP Bug Type: Session related
Bug description: unset($var) doesn't unset session value with register_globals on
Description:
------------
This is related to bug #19586 and only applies when register_globals is
"on". If a global variable is registered to the session, then an unset()
on that global variable will unset it on the current page, but its
original value is restored on the next session_start(). I expected it to
also be unset in the session, which is how it behaved in older versions of
PHP. The workaround provided in bug #19586, unset($var, $_SESSION['var']),
does work. However, this means that older code written for
register_globals "on" may behave differently when moved to newer PHP
versions, a subtle bug. It would be helpful if the code was fixed or the
documentation updated to make folks aware of this potential problem.
Reproduce code:
---------------
file: test.php
<?
session_start();
$a = 'zero';
session_register('a');
unset($a);
?>
<br><a href='./test2.php'>next</a>
file: test2.php
<?
session_start();
echo "a is $a<br>";
?>
Expected result:
----------------
I expected $a to not have a value on test2.php, which is the case for this
same code running on PHP 4.0.6.
Actual result:
--------------
On the second page, test2.php, $a has the value 'zero', as originally
assigned on the first page.
--
Edit bug report at http://bugs.php.net/?id=24270&edit=1
--
Try a CVS snapshot: http://bugs.php.net/fix.php?id=24270&r=trysnapshot
Fixed in CVS: http://bugs.php.net/fix.php?id=24270&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=24270&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=24270&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=24270&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=24270&r=support
Expected behavior: http://bugs.php.net/fix.php?id=24270&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=24270&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=24270&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=24270&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=24270&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=24270&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=24270&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=24270&r=gnused
