How can PHP developers ensure that session data is properly managed and cleared after a user completes a transaction or logs out of the system?

To ensure that session data is properly managed and cleared after a user completes a transaction or logs out of the system, PHP developers can use the session_unset() function to remove all session variables and session_destroy() function to destroy the session. This will ensure that any sensitive information stored in the session is cleared and not accessible after the user logs out.

// Clear session data after user logs out
session_unset();
session_destroy();