|  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #19613 putenv("VAR=") does not empty VAR on win32
Submitted: 2002-09-26 08:32 UTC Modified: 2003-07-24 03:10 UTC
From: six at aegis-corp dot org Assigned: sfox (profile)
Status: Closed Package: Other web server
PHP Version: 4.2.3 OS: Win2K
Private report: No CVE-ID: None
 [2002-09-26 08:32 UTC] six at aegis-corp dot org
It appears that in Win32 (with php-cli.exe), the putenv function works quite strangely.

When you call putenv("VAR="), this sould empty the "VAR" environment variable. And it almost does it, because a call to getenv("VAR") will return an empty string. However, the real env is not changed and VAR is still set to its old value.

This small script (and its output) demonstrate the problem :

echo getenv("TEST")."\n"; // "ZOB1"
system("echo %TEST%");    // "ZOB1"
echo getenv("TEST")."\n"; // ""
system("echo %TEST%");    // "ZOB1" <- should be empty !
echo getenv("TEST")."\n"; // "ZOB2"
system("echo %TEST%");    // "ZOB2"



Add a Patch

Pull Requests

Add a Pull Request


AllCommentsChangesGit/SVN commitsRelated reports
 [2003-06-23 02:10 UTC] ruta at teltec dot de
Same Problem on WIN 2000 Server with Apache2. Thanks...


Thomas Ruta
 [2003-07-23 16:29 UTC]
Patch sent to internals@
 [2003-07-24 03:10 UTC]
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at
In case this was a documentation problem, the fix will show up soon at

In case this was a website problem, the change will show
up on the site and on the mirror sites in short time.
Thank you for the report, and for helping us make PHP better.

PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Tue Jun 18 22:01:29 2024 UTC