Book excerpt: Design patterns are comprehensive, well-tested solutions to common problems that developers everywhere encounter each day. Although designed for solving general programming issues, some of them have been successfully adapted to the specific needs of Web development.php architect's Guide to PHP Design Patterns is the first comprehensive guide to the application of design patterns to the PHP development language. Designed to satisfy the need of enterprise-strength development, you will find this book an excellent way to learn about design patterns and an irreplaceable reference for your day-to-day programming.With coverage of more than 16 different types of patterns, including Model-View-Controller, Iterator, MockObject, Register, Proxy, ActiveRecord, DataMapper and many, many others, this book is the ideal resource for your enterprise development with PHP 4 and PHP 5.* Includes over 16 design patterns* Each pattern is discussed in detail with practical code applications* Covers both PHP 4 and PHP 5* Provides a thorough test-driven approach to design patterns* Code is available online