Migrates the current session to a new session id while maintaining all session attributes.
@api
Boolean $destroy Whether to delete the old session or leave it to garbage collection.:
integer $lifetime Sets the cookie lifetime for the session cookie. A null value: will leave the system settings unchanged, 0 sets the cookie to expire with browser session. Time is in seconds, and is not a Unix timestamp.
Boolean True if session migrated, false if error.
public function migrate($destroy = false, $lifetime = null);