I have tried to write a facebook application in php. But the http://svn.facebook.com/svnroot/platform/clients/packages/facebook-platform.tar.gz shows 404 found error or "connecting failed error". And http://developers.facebook.com/resources.php is also returning the same. The face book has withdrawn php api?
It may be a temporary problem. It's unlikely that they'll drop php support given that facebook itself is written in php
I too received this error. The chances are it's a temporary mislocation of their resources. Give them time to sort it out or send them a quick email!