What steps can be taken to simplify and isolate complex PHP scripts in order to identify the root cause of session-related issues?

Session-related issues in PHP can be complex and difficult to debug. To simplify and isolate these issues, it's important to break down the script into smaller, manageable parts. One approach is to create a minimal, standalone script that focuses solely on the session-related functionality in question. By removing unnecessary code and isolating the session-related logic, it becomes easier to identify the root cause of the issue.

<?php
// Start the session
session_start();

// Your session-related code here

// Debugging output
echo '<pre>';
var_dump($_SESSION);
echo '</pre>';