PHP facebook logout?

//for some reason, facebook getlogouturl does not seems to be able to populate access_token byitself.
//Therefore this method forces it to attach the access token:

$logoutUrl = $facebook->getLogoutUrl(array(

        "next" => "yourdomain.com?logout=1", "access_token" => $facebook->getAccessToken()

      ));

$facebook->destroySession();

<script>

document.location.href="<?=$logoutUrl?>";

</script>