PHP is an open source, server-side HTML-embedded web-scripting language for creating dynamic web pages. Outside of being browser-independent, it offers a simple and universal cross-platform solution for e-commerce, complex web, and database-driven applications. Professional PHP4 will show you exactly how to create state of the art web applications that scale well, utilize databases optimally, and connect to a back-end network using a multi-tiered approach. This book also aims at teaching PHP by coding - among other things - FTP clients, e-mail clients, some advanced data structures, session management, and secure programming.