php books, advanced level

[unwashed potato!]

really wanting to improve my knowledge of php further and although reading/researching online is a great way to learn at first, a really great php book for advanced users i think would be best for me and should hopefully be able to teach me how to use php to it's fullest.

i read once before on here that a good one was "PHP 5 Objects, Patterns, and Practice" but finding this new in uk is hard and also a little concered that perhars you lot can reccomend me something better?

thanks.