One thing that really makes this book useful is ease of navigation. The secitons and chapters make sense, and as a result, finding what you need is not a frustrating experience. Each chapter poses a common problem and explains the solution, and the chapters are designed to cover the most common PHP challenges in the major areas. Even the Introduction, an overview of PHP, provides useful information. Sections include Using Databases with PDO, Strings, Dates and Times,Forms, Tables, and Pretty URLs, Working with Files, Email, Images, and Error Handling, Access Control, Caching, XML and Web Services, and Best Practices.