Hello,
I have bought plenty of PHP books within my time of programming with PHP & mySQL, and in fact I have the exact same book you have. It is indeed a great book. My suggestions for new books would have to be the following:

- Core PHP Programming
- Beginning PHP 5 and mySQL (From Novice To Professional)

Those two are some great books. Also the SAMS books are pretty decent as well. If you need some help with scripts you are creating or just want to chat feel free to contact me via messenger or whatever. I'm always open to meeting new people/helping them out.