What are the potential pitfalls of using sessions in PHP, especially in terms of security and data integrity?

One potential pitfall of using sessions in PHP is the risk of session hijacking, where an attacker steals a user's session ID and impersonates them. To mitigate this risk, it is recommended to regenerate the session ID on every request to prevent session fixation attacks.

// Regenerate session ID on every request
session_regenerate_id(true);