phpCAS::handleLogoutRequests PHP Method

    public static function handleLogoutRequests($check_client = true, $allowed_clients = false)
    {
        phpCAS::_validateClientExists();
        return self::$_PHPCAS_CLIENT->handleLogoutRequests($check_client, $allowed_clients);
    }

 private function prepare()
 {
     \phpCAS::client(CAS_VERSION_2_0, $this->casUrl, $this->casPort, $this->casUri, false);
     //\phpCAS::setDebug('/tmp/cas.log');
     \phpCAS::setNoCasServerValidation();
     //\phpCAS::setSingleSignoutCallback(array($this, 'casSingleSignOut'));
     //\phpCAS::setPostAuthenticateCallback(array($this, 'casPostAuth'));
     \phpCAS::handleLogoutRequests(true, $this->casAllowedIpClients);
 }