I kind of agree with masonbarge.

There isn't really many good websites that can teach you PHP in plain English but books can.

I would recommend PHP Solutions by David Powers. It taught me hell of a lot about PHP while making it easy to understand. It also focuses a lot on security. It uses real life examples throughout that you can use immediately.

It teaches you PHP as well as MySQL and how they speak to each other, also giving backwards compatibility for PHP 4.

If you want my advice... Buy this book.