session_regenerate_id() will replace the current session id with a new one, and keep the current session information.
Devuelve TRUE si todo se llevó a cabo correctamente, FALSE en caso de fallo.
Nota: As of PHP 4.3.3, if session cookies are enabled, use of session_regenerate_id() will also submit a new session cookie with the new session id.
See also session_id(), session_start(), and session_name().