How do I kill a PHP session?

Question

I am writing a social networking site, and I am trying to figure out PHP sessions. At the top of the login page, I call session_destroy(), and I call session_start() at the

Answer 1

Use session_destroy to destroy the session data and session_unset to clear the $_SESSION variable respectively.

Furthermore, call session_regenerate_id(true) after an authentication attempt to change the current session’s ID and destroy the session data that is still associated to the old session ID.