How can PHP developers ensure that sensitive user data is not exposed when navigating back in the browser using session management techniques?

Sensitive user data can be protected from exposure when navigating back in the browser by using session management techniques such as storing sensitive data in server-side sessions and regenerating session IDs upon each request. This ensures that sensitive data is not stored in the browser history or cache, reducing the risk of exposure.

// Start the session
session_start();

// Store sensitive user data in session variables
$_SESSION['username'] = 'example_user';
$_SESSION['email'] = 'example@example.com';

// Regenerate session ID to prevent session fixation attacks
session_regenerate_id(true);