What are some potential security risks when using session management in PHP?

One potential security risk when using session management in PHP is session fixation, where an attacker can set the session ID before the user logs in, allowing them to hijack the session. To mitigate this risk, you can regenerate the session ID after a successful login to ensure that a new session is created.

// Start the session
session_start();

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