Why is it recommended to change the session ID after a successful login in PHP projects?

After a successful login in PHP projects, it is recommended to change the session ID to prevent session fixation attacks. Session fixation is a type of session hijacking where an attacker sets a user's session ID before the user logs in, allowing them to access the user's account. By changing the session ID after a successful login, you can ensure that the session is secure and not vulnerable to such attacks.

// Start the session
session_start();

// Regenerate the session ID
session_regenerate_id(true);