How can you troubleshoot issues with sessions not working on mobile websites in PHP?

To troubleshoot issues with sessions not working on mobile websites in PHP, you can start by checking if cookies are enabled on the mobile browser. If cookies are disabled, sessions won't work properly. You can also try setting the session cookie parameters explicitly and ensure that session_start() is called before any output is sent to the browser.

<?php
// Set session cookie parameters
session_set_cookie_params(0, '/', '', false, true);

// Start the session
session_start();

// Your PHP code here
?>