What potential security risks are associated with session handling in PHP?

One potential security risk associated with session handling in PHP is session fixation, where an attacker sets the session ID to a known value before the user logs in, allowing them to hijack the session. To prevent this, you can regenerate the session ID after a successful login to ensure that each session has a unique identifier.

// Start the session
session_start();

// Regenerate the session ID after a successful login
if($login_successful) {
    session_regenerate_id(true);
}