Thank you very much for puting it out there. The fact that PHP developers "know" Object-Oriented programming is in fact an underestimation. And it hurts the developers - there is an assumption that everyone out there knows and uses object-orientation. That is why - in turn - there are so little modern books about programming PHP in an object-oriented fashion.
The reasoning behind it is clear - well, object-orientation should be a must by now, so there is no need to write/publish a book about it for beginners. Insead, let's print yet another book about agile!
That is why I've founded the web site Object-Oriened-PHP (http://object-oriented-php.com)