How can the issue of sessions not being saved or overwritten be addressed in PHP?

To address the issue of sessions not being saved or overwritten in PHP, you can ensure that session data is properly saved by calling session_write_close() at the end of your script. This function writes session data and closes the session, preventing any further changes to the session data.

<?php
session_start();

// Your PHP code here

session_write_close();
?>