Bug #31455 [Com]: multiple session_start() creates multiple session cookies in HTTP-Response
Edit report at https://bugs.php.net/bug.php?id=31455&edit=1
ID: 31455
Comment by: danielc at analysisandsolutions dot com
Reported by: rene dot bangemann at web dot de
Summary: multiple session_start() creates multiple session
cookies in HTTP-Response
Status: Wont fix
Type: Bug
Package: Session related
Operating System: Win32
PHP Version: 4CVS, 5CVS
Assigned To: tony2001
Block user comment: N
Private report: N
New Comment:
See also: https://bugs.php.net/bug.php?id=31455
Previous Comments:
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[2010-10-15 23:26:30] WarrenGaebel at FriendlyNeighbourGuide dot ca
I am experiencing a similar, but not identical problem.
I reload my page multiple times, using session_start() every time it loads. JavaScript sets cookies
that I use in php. When using Internet Explorer, $_ENV["HTTP_COOKIE"] contains multiple
entries for each cookie. This does not happen with Firefox.
As near as I can figure so far, when executing code at a domain named x.y.z, Internet Explorer sends
the cookies for x.y.z followed by the cookies for y.z. Php then puts both sets of cookies into
$_ENV["HTTP_COOKIE"].
Perhaps this may be considered a PHP bug, perhaps not. IMHO, this is an Internet Explorer bug. I
post it here in the hope that it may help you resolve your problem.
... Warren Gaebel, B.A., B.C.S.
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[2005-02-14 00:18:30] rene dot bangemann at web dot de
Ok, you are right that someone could start several sessions within one request. But thats not my use
case:
I'm using a PHP script to perform some actions which can take up to some hours.
E.G. for displaying progress information about the running process a second php script needs to
access the session vars. This forces to close the session file via session_write_close() in the
first script. After this function call, the second PHP script can do a session_start() and access
the current values of the session vars.
After finishing the second request the session file will be closed again.
If the first script has to store new values of session related vars in the session file, it uses a
combination of session_start() and session_write_close() to update the content within the session
file.
Unfortunatly in my case this can happen very often (because of the long execution time).
Under normal circumstances I could live with this feature :-). But I'm afraid that in
combination with HTML frames this behaviour of PHP can force deadlocks in different browsers like
Internet Explorer or Mozilla. Unfortunately I can't present a 100% working example for
reproducable deadlocks.
I would suggest to create a flag containing true or false, if the Cookie for the current session id
already was sent or not.
If the cookie wasn't already sent, or the used session id changes, of course another Cookie has
to be sent.
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[2005-02-13 18:03:51] tony2001@php.net
Okay, no more dirty hacks =)
Marking it as "won't fix" and considering as a feature.
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[2005-02-13 09:44:30] sniper@php.net
Then how would you handle this (very unlikely :) code:
<?php
session_name('foo1');
session_id('foobar1');
session_start();
session_write_close();
session_name('foo2');
session_id('foobar2');
session_start();
session_write_close();
session_name('foo3');
session_id('foobar3');
session_start();
session_write_close();
?>
Yes, someone MIGHT rely on that kind of code too.
And as it IS possible to start as many _different_ sessions in single request, why should we not
allow it?
(this is actually for Tony, FYI when he figures out how to fix this bug :)
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[2005-01-09 15:49:13] rene dot bangemann at web dot de
Description:
------------
I'm using a combination of session_start() and session_write_close() to access and update
session variables.
In some scripts this function calls will be executed up to 50 times.
For each call of session_start() a HTTP-Header with the PHP session id will be created in the same
HTTP response.
I would expect, that in the HTTP response will be only one HTTP-Header with the session id.
Reproduce code:
---------------
<?php
session_start();
session_write_close();
session_start();
session_write_close();
session_start();
session_write_close();
?>
Expected result:
----------------
HTTP-Header Set-Cookie with PHP session id created only once in HTTP response
Actual result:
--------------
The code above will create a HTTP response with three identical HTTP Set-Cookie headers
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