I really like W3Schools and php.net, but my first port of call for any web-programming languages is htmlgoodies.com. As Pontus said, object oriented programming knowledge is very handy to use PHP effectively, but you can plug certain bits and pieces into your code without worrying about the OOP side of things. Lots of experimentation will be your best friend while you're learning. Also, you should pay close attention to the error messages you get - they're the most useful tool in debugging your code.

<a href="http://www.htmlgoodies.com/beyond/php/">PHP info</a>; <a href="http://www.htmlgoodies.com/primers/jsp/">Javascript info</a>.