What is the impact of frame-based pages on maintaining session IDs in PHP?

When using frame-based pages in PHP, the session ID may not be maintained across frames, leading to session data being lost or not accessible. To solve this issue, you can pass the session ID between frames using URL parameters or cookies to ensure that the session remains active and consistent.

// Start the session
session_start();

// Set the session ID in a cookie
setcookie('PHPSESSID', session_id(), time() + 3600, '/');

// Retrieve the session ID from the cookie
$session_id = $_COOKIE['PHPSESSID'];

// Use the session ID to maintain session data across frames
session_id($session_id);
session_start();