Check out some other web sites to learn a little more about PHP once you are done with this book. Here are some recommendations:
www.php.net—This is the official PHP web site. You can read the documentation or see a full and complete function list. The tutorial is excellent.
php.resourceindex.com—This is a great resource for working PHP scripts and tutorials. You can find a lot of cool tips and hacks.
www.courseptr.com—This site offers books that can take your PHP and SQL/MySQL studies to a higher level.