Are there any potential security risks or vulnerabilities to consider when using sessions in a PHP quiz script?

One potential security risk when using sessions in a PHP quiz script 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 prevent session fixation attacks.

// Start or resume a session
session_start();

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