Just in case you don’t know, Facebook has just released a new doc set on the PHP SDK. It is available online at http://developers.facebook.com/docs/reference/php/.
While this is the first version of the doc, it may not be perfect. Having said that, I think it be very helpful people who are new to the PHP SDK and is a handy reference of those who use the PHP SDK too.
Thanks Facebook team for such a nice piece of work!