php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #1971 Problem with unsetting global-variables
Submitted: 1999-08-05 10:45 UTC Modified: 1999-08-07 13:11 UTC
From: jeress at iname dot com Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.0 Beta 1 OS: Linux (Debian potato), glibc2.1
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If this is not your bug, you can add a comment by following this link.
If this is your bug, but you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: jeress at iname dot com
New email:
PHP Version: OS:

 

 [1999-08-05 10:45 UTC] jeress at iname dot com 
The following returns 2 under PHP3 and 1 under PHP4:
----
<html>
<body>
<?php
$tv = 1;

function test1()
{
global $tv; unset($tv); $tv = 2;
}

function test2()
{
global $tv; echo("should be 2: $tv");
}

test1();
test2();
?>
</body>
</html>
---
I don't think this is a compile/module problem (compiled with mysql, nothing else that really matters).

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [1999-08-07 13:11 UTC] zeev at cvs dot php dot net 
This is an undocumented incompatiblity to an undocumented behavior.

in PHP 4.0 - with the notion of references - the behavior of
unset() is extremely clear - only the symbol you unset() is unset.
In this case, $tv is a local variable that points to the global
variable with the same name - so unsetting it only unsets the
local $tv.  If you want to unset the actual global $tv, you should
use unset($GLOBALS["tv"])
 
PHP Copyright © 2001-2019 The PHP Group
All rights reserved. 		Last updated: Sat Aug 17 14:01:28 2019 UTC