Personally I always go for O'Reilly books.
One good one I was given that doesnt have an animal on the front is
PHP & MySQL Web Developement by Welling and Thomson published by Sams.
It starts off with the basics and works its way up. It covers some areas far better than the O'Reilly book.
One good tip I heard the other day. Dont buy the PHP Pocket Reference by O'Reilly if you already have the Webmaster in a Nutshell by them. Its just the PHP chapter from that book. And as the Webmaster one has a /lot/ more information for not that much more price go for that.
MrRosary