What role does the session ID play in PHP session management and security?

The session ID plays a crucial role in PHP session management and security as it uniquely identifies a user's session. It is used to associate a user with their session data stored on the server. To enhance security, it is important to regenerate the session ID periodically to prevent session fixation attacks.

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