session_write_close

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

session_write_closeWrite session data and end session

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.

Return Values

No value is returned.

See Also

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User Contributed Notes 25 notes

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Anonymous
7 years ago
You can have interesting fun debugging anything with sleep() in it if you have a session still active.  For example, a page that makes an ajax request, where the ajax request polls a server-side event (and may not return immediately).

If the ajax function doesn't do session_write_close(), then your outer page will appear to hang, and opening other pages in new tabs will also stall.
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atul at jreply dot com
4 years ago
An easy gotcha here - the $_SESSIONS superglobal does not vanish because you call session_write_close.  If subsequent to the write_close call if you manipulate the superglobal the changes will not be saved when the script exists.  Likewise a call to session_regenrate_id will fail.

Closing the session and then manipulating session variables is not something many would do by intent.  However, if your sessions suddenly start misbehaving, failing to record changes etc it is well worth checking that the cause is not this one!
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risaac at deadletter dot com
11 years ago
Workaround if session_write_close() still doesn't write sessions fast enough:

I found with one PHP login system that even session_write_close() was not setting the session variables before I transferred pages with a Location: header.  So the user would log in, I would create the $_SESSION variables, call session_write_close() and then transfer to the secure page using header(Location:...).  The secure page would check for the session vars, not find them, and force the user to log in again.  After the second login the session would be found and they could continue.

My workaround was to create the $_SESSION variables with 0 values before writing the initial login page.  Then I updated the session vars with the login results and used the header() function to switch to the secure location.  Once the session vars have already been created, updated values are assigned quickly.  Problem solved.  Just be sure the secure page checks both that the $_SESSION var exists AND that it's not 0.
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4 years ago
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11 years ago
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4 years ago
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7 years ago
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7 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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4 years ago
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