What role does the order of code execution play in maintaining PHP sessions across different pages?

The order of code execution is crucial in maintaining PHP sessions across different pages because sessions need to be started before any output is sent to the browser. This ensures that session data can be stored and retrieved correctly. To maintain PHP sessions across different pages, always start the session at the beginning of each page before any other code is executed.

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

// Other PHP code here
?>