How can PHP developers ensure that user sessions are properly managed and terminated to avoid issues like users being perpetually logged in?

To properly manage and terminate user sessions in PHP, developers can set session expiration times, use session_regenerate_id() to generate a new session ID upon login, and call session_destroy() when logging out to ensure the session is terminated.

// Set session expiration time to 30 minutes
ini_set('session.gc_maxlifetime', 1800);

// Regenerate session ID upon login
session_start();
session_regenerate_id();

// Destroy session upon logout
session_destroy();