I want to learn about PHP and MySQL. what kind of books can I read?

I want to learn about PHP and MySQL. what kind of books can I read? I like programming. now I am learning C language, but I still want to learn PHP and MySQL. Should I first learn HTML and CSS? And then start learning PHP and MySQL? Also, what teaching materials are recommended ?, Html and css are relatively simple to learn together. You can also skip learning. I want to learn PHP and MySQL first. what kind of books should I read?
I like programming. now I am learning C language, but I still want to learn PHP and MySQL. Should I first learn HTML and CSS? And then start learning PHP and MySQL? Also, what teaching materials are recommended?

------ Solution --------------------
Html and css are relatively simple to learn together. You can also skip learning, but you must understand it in the future. this is not difficult.

I recommend this for books.
Http://blog.csdn.net/phpnewnew/article/details/6896582
------ Solution --------------------
Yes. The w3c website is good.