#19613 [Opn->Ver]: putenv("VAR=") does not empty VAR on win32

From: Date: Sat, 05 Oct 2002 06:56:57 +0000
Subject: #19613 [Opn->Ver]: putenv("VAR=") does not empty VAR on win32
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-21543@lists.php.net to get a copy of this message 
 ID:               19613
 Updated by:       iliaa@php.net
 Reported By:      six@aegis-corp.org
-Status:           Open
+Status:           Verified
 Bug Type:         Other web server
 Operating System: Win2K
 PHP Version:      4.2.3


Previous Comments:
------------------------------------------------------------------------

[2002-09-26 08:32:37] six@aegis-corp.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 :

C:\php>php-cli
<?
putenv("TEST=ZOB1");
echo getenv("TEST")."\n"; // "ZOB1"
system("echo %TEST%");    // "ZOB1"
putenv("TEST=");
echo getenv("TEST")."\n"; // ""
system("echo %TEST%");    // "ZOB1" <- should be empty !
putenv("TEST=ZOB2");
echo getenv("TEST")."\n"; // "ZOB2"
system("echo %TEST%");    // "ZOB2"
?>
ZOB1
ZOB1

ZOB1
ZOB2
ZOB2

------------------------------------------------------------------------


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