Below is a list of books that I highly recommend. These are all books that I have personally read. But better, I have arranged them into Tracks so that you can progressively learn a particular set of skills.
PHP Web Development Track
|HTML and CSS: Design and Build Websites
|PHP and MySQL Web Development – This book is truly the right way to fundamentally get into PHP.
|CakePHP 1.3 Application Development Cookbook – Although CakePHP is into its version 2, it begins to gain in complexity. Learning 1.3 does not hurt one bit!
|Building PHP Applications with Symfony, CakePHP, and Zend Framework