How does the use of session_write_close() impact the ability to update the session database?

When session_write_close() is called, it closes the session and writes the session data. This means that any changes made to the session data after calling session_write_close() will not be saved. To update the session database after making changes, you should avoid calling session_write_close() until you have finished updating the session data.

// Update session data
$_SESSION['key'] = 'value';

// Do not call session_write_close() until after updating session data
// session_write_close();

// Update session database
session_start();
// Perform any necessary updates to session data
session_write_close();