Are there any potential security risks associated with using session variables in PHP?

Using session variables in PHP can pose security risks if not properly handled. One potential risk is session hijacking, where an attacker steals a user's session ID and impersonates them. To mitigate this risk, it is important to regenerate the session ID after a user logs in or changes privilege levels.

// Regenerate session ID after login or privilege change
session_start();
session_regenerate_id(true);