facebook/facebook-php-sdk — pull request #47 by ankithbti (2012-12-05 13:08:45+00:00)
Title: Correcting the bug : Logout not working properly using PHP SDK

Explanation about the bug: http://developers.facebook.com/bugs/332783370135508/

I have added the session_destroy() in getLogoutUrl function.
Now it is working as expected.