Session_write_close function allows to writing of session data and closing a session. As part of our Drupal Software Development, Bobcares provides answers to all of your questions.

Session_Write_Close Function in PHP

When we use PHP’s session_start function to begin a session, the server creates a session file to hold session data. Unless we explicitly close the session using session_write_close, it stays open. Upon calling session_write_close, the session data is written to the session file and the file lock is released, enabling access to the session data for subsequent requests.

We should be aware that calling this function ends the session write phase rather than ending the session itself.

An Example

The following example explains the usage of the session_write_close function.

We’ll need to call session_start again in order to reopen the session and continue modifying the session variables if we need to change the session data after calling session_write_close. If we don’t need to make any additional changes to the session data, it’s better to call session_write_close as early as possible in the code. By doing this, the session file lock is released and other requests’ concurrent access to the session data is enhanced.

Fixing “Failed to Write Session Data with Drupal”

Here, the session gets lost when a new redirect action is created. When we see the below error, we can reproduce it as follows:

i. Create a new redirect action /admin/config/workflow/business_rules/action/add

ii. Save

We can also resolve the issue by raising the max_allowed_packet in the DB configuration file.

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Conclusion

To sum up, the Support team went over the details of the session_write_close function along with troubleshooting an issue associated with this function in Drupal.