Case in point: The ever-essential task of using PHP to open a connection to a MySQL database, submit a query to that database, receive a response, and format the returned rows, if any. The book addresses this problem with a straight code listing, followed by text that explains what's happening in five numbered steps. Similar care goes to the other popular applications of the PHP/MySQL duo: session management, shopping carts, and authentication of users. --David Wall

Topics covered: How to use the PHP server-side scripting language and the MySQL database engine to underlie dynamic Web sites (those that rely on database queries) and full-on Web applications, such as those that require session management and maintenance of user rosters. Tutorials in both subjects begin with the basics and proceed through moderately complicated stuff, though there's no absolutely comprehensive reference here.