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Bug #25534 "A session had already been started"
Submitted: 2003-09-14 22:44 UTC Modified: 2003-09-15 02:40 UTC
From: yipchiu8 at netvigator dot com Assigned:
Status: Not a bug Package: Session related
PHP Version: 4.3.3 OS: windows xp sp1
Private report: No CVE-ID: None
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 [2003-09-14 22:44 UTC] yipchiu8 at netvigator dot com 
Description:
------------
I used PHP 4.3.2. to create a web site. Anything is okay.
After installing PHP 4.3.3, my site can't be accessed. It always display as follows : 

----------------------------------------------------
Notice: A session had already been started - ignoring session_start() in c:\inetpub\wwwroot\assessment\student.php on line 32

Warning: Cannot modify header information - headers already sent by (output started at c:\inetpub\wwwroot\assessment\student.php:32) in c:\inetpub\wwwroot\assessment\student.php on line 43
-----------------------------------------------------

After downgrading from 4.3.3. to 4.3.2, my site back to normal again.

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 [2003-09-15 02:40 UTC] phildriscoll@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

PHP 4.3.3 fixes a bug in ealier versions of php whereby a 
warning was not issued when session_start was called more 
than once. You are now seeing the warning message because 
you code has two or more calls to session_start. You need 
to either remove the duplicate session_start calls or, if 
this is not possible, wrap the calls to session_start with 
some code which first checks if the session has already 
started. Maybe something like 
if(!session_id())session_start();
 
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