How can the structure of PHP code impact the functionality of session variables across different pages in a web application?
The structure of PHP code can impact the functionality of session variables across different pages in a web application if the session_start() function is not called at the beginning of each page where session variables are used. To ensure session variables work properly across pages, session_start() should be included at the top of every PHP page that needs to access session data.
<?php
session_start();
// Your PHP code here
?>