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[2002-02-08 00:26 UTC] paul dot lists at burney dot ws
Using PHP 4.1.x, the following code, which is intended to
delete a cookie, instead replaces the value with %00 (ascii
entity null?)
Cookies are set with the following:
setcookie($username_cookie,'username');
setcookie($password_cookie,md5('password'));
Cookies are deleted with the following:
setcookie($username_cookie);
setcookie($password_cookie);
Yes, the $username_cookie and $password_cookie variables
have values.
The above is case (a) in the documentation, the simplest
case.
I've tried this on all the systems I have access to.
Affected:
Solaris 7, PHP 4.1.0
Red Hat 7.1, PHP 4.1.1
Not Affected:
Red Hat 7.1, PHP 4.04pl1
Mac OS X 10.1.2, PHP 4.0.6
Solaris 7, PHP 4.06
One affected system that I've used is on a web host
(communitech.net, who just very recently moved to PHP 4.1.0
from 3.0.9, Solaris 7). The other is on the freshly setup
intranet server at my employer (Linux 4.1.1).
Here's the configuration line (Solaris 7, PHP 4.1.0):
?'./configure' '--with-mysql=/usr/local/mysql' '--with-
curl=/root/src/curl/curl-7.9.3' '--with-xml' '--with-
apache=/root/src/apache/apache-fp_1.3.3'
And the one from Red Hat 7, PHP 4.1.1:
'./configure' '--prefix=/usr/local' '--with-apache=/usr/
local/src/apache/Apachetoolbox-1.5.50/apache_1.3.22' '--
enable-exif' '--enable-track-vars' '--with-calendar=shared'
'--enable-safe-mode' '--enable-magic-quotes' '--enable-
trans-sid' '--enable-wddx' '--enable-ftp' '--with-gd=/usr/
local' '--with-zlib' '--enable-gd-native-tt' '--with-t1lib=
/usr/local' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '-
-with-zlib-dir=/usr' '--with-ttf' '--with-freetype-dir=/
usr' '--with-imap=/usr/local' '--with-openssl=/usr' '--
with-mysql=/usr/local/mysql' '--with-pgsql' '--with-ldap'
The same code works in previous versions of PHP to 4.1, as
indicated above. I've tried the code in three different
browsers so I don't think it is browser dependent.
The actual piece of code is part of a larger system. I can
give you the code or access to one of the servers if
necessary.
Thanks in advance.
Paul Burney
Webmaster
Concord Consortium and UCLA GSE&IS
PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Sun Nov 02 07:00:01 2025 UTC |
On the documentation page it says: "When deleting a cookie you should assure that the expiration date is in the past, to trigger the removal mechanism in your browser." However, since the first delete cookie example doesn't have any value for the "expire" argument, it is implied that if called with only the variable name, PHP will automatically assure that the expiration date is in the past. The code you provided works, of course. There is definately a difference in the way that PHP 4.1.x handles this than previous versions. I guess this is now a documentation problem. From the setcookie documentation, under setcookie() delete examples, the first listed is: setcookie ("TestCookie"); Which in PHP 4.1.x just sets the cookie to %00 as the original bug stated. I suggest removing that example. Also the function definition should no longer suggest that setcookie only requires one argument.I'm using PHP Ver.4.3.2 I have the same problem too, when use setcookie(<cookiename>), Cookie is set to %00 instead of erased. The problem happen when it hit this syntax : if(isset($_COOKIE['register'])) {echo $_COOKIE['register'];} Neither isset or !empty function could detect whether it's empty or not. It always return true, so it will try to display the value $_COOKIE['register'] that has been deleted. It returned error message : Notice: Uninitialized string offset: 0 in D:\My Web\register.php on line 186 Thanks in advance.