The book by a well-known professional in the field of web application development is devoted to a new version of the currently most popular scripting language for the server - PHP 5. This language allows you to develop high-performance Web sites of any scale and any category of complexity. The book deals in detail with such issues as basic syntax constructs of the language, object-oriented programming in PHP, working with databases and graphic images, as well as building WAP-content. Much attention is paid to effective solutions to typical practical problems, including visitor authentication, data encryption, session use, error handling, e-mail. The book is replete with many examples that are available for download on the publisher's website. The book is designed for developers of different qualifications, and can also be useful for students and teachers of relevant specialties .