PHP: session_write_close

Description

void session_write_close ( void )

End the current session and store session data.

Session data is usually stored after your script terminated without the need to call session_write_close(), but as session data is locked to prevent concurrent writes only one script may operate on a session at any time. When using framesets together with sessions you will experience the frames loading one by one due to this locking. You can reduce the time needed to load all the frames by ending the session as soon as all changes to session variables are done.

User Contributed Notes
session_write_close

editorial at literati dot ca
15-May-2005 03:13


Further to the comment by nakanishi at mailstyle dot com, it appears that calling session_write_close() followed by session_start() causes issues if you have more than one browser window/tab open in the session, and have a large session data array.  I have an intermitent (and hard to replicate reliably) issue with session_start() never being called or not returning - the script hangs before the session headers are written.  I'm puting this down to trying to be too clever rather than to a bug per se.

mhormann (at) gmx.de
23-Dec-2004 08:15


Using session_flush() is NOT recommend and appears to be gone in 4.3.9 and 4.3.10 anyway.

kumar mcmillan
06-May-2004 11:54


if you are trying to work with a larger code base meant for a specific application... and it implements some custom session save handlers, it appears there is no way to reset those save handlers back to the default php state if they are getting in your way.  my workaround:



session_write_close(); // close the session at the top of the page :)

jp at webgraphe dot com
21-Nov-2003 05:50


It is a good idea to call session_write_close() before proceeding to a redirection using



header("Location: URL");

exit();



because it ensures the session is updated (in a file or into a database, depending on the handler you're using) BEFORE you redirect the visitor somewhere else.



JP.

nakanishi at mailstyle dot com
19-Jan-2003 01:04


Make sure that you call session_start() again after session_write_close() if you rely on the SID rewriting.  Otherwise it will not be rewritten.

19-Apr-2002 09:48


This function is very useful for session objects. The class def'n of an obj needs to be included before the session is started. You can ignore this by closing the session with this function, and then use session_start() to restart it. Do this after including the class definition, but before using the session variable.