App\Libraries\UserVerification::legacySession PHP Method

    public function legacySession()
    {
        if ($this->_legacySession === false) {
            $session = LegacySession::loadFromRequest($this->request);
            if ($session !== null && $session->session_user_id !== $this->user->user_id) {
                $session = null;
            }
            $this->_legacySession = $session;
        }
        return $this->_legacySession;
    }