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PHP: Hypertext Preprocessor is a widely used, server side scripting language that was originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document. As a general-purpose programming language, PHP code is processed by an interpreter application in command-line mode performing desired operating system operations and producing program output on its standard output channel. It may also function as a graphical application. PHP is available as a processor for most modern web servers and as standalone interpreter on most operating systems and computing platforms..

Rasmus Lerdorf, who wrote the original Common Gateway Interface component, and Andi Gutmans and Zeev Suraski, who rewrote the parser that formed PHP 3
Introduction

PHP5 is the latest incarnation of PHP (PHP: Hypertext Preprocessor)—a programming language devised by Rasmus Lerdorf in 1994 for building dynamic, interactive Web sites. Since then, it's been evolving into a full-fledged language in its own right, thanks to the hard work of all the people who contribute to its development.

A sure sign that PHP is maturing as a technology is evidenced by its totally revamped and upgraded support for object-oriented programming (OOP) principles and improved support for XML. The Zend engine (the part that interprets and executes PHP code) now enables PHP5 developers to implement, among a host of other things, graceful application-wide error handling.

With all the new features and functionality that PHP5 provides, it's important for programmers to "upgrade" their understanding in order to best make use of this powerful Web scripting tool. And that's why it's important for you, the reader, to invest your time learning about the latest and greatest that the people developing PHP5 have to offer.

That's all well and good, but what exactly is PHP?

You know it's a language for writing computer programs, so the real question is "What sort of programs can you write with it?" In technical terms, PHP's main use is as a cross-platform, HTML-embedded, server-side Web scripting language. Let's take a moment to examine these terms:

Cross-platform: Most PHP code can be processed without alteration on computers running many different operating systems. For example, a PHP script that runs on Linux generally also runs well on Windows.

HTML-embedded: PHP code can be written in files containing a mixture of PHP instructions and HTML code.

Server-side: The PHP programs are run on a server—specifically a Web server.

Web-scripting language: PHP programs run via a Web browser.

This means you'll write programs that mix PHP code and HTML, run them on a Web server, and access them from a Web browser that displays the result of your PHP processing by showing you the HTML returned by the Web server. In other words, you can make your programs available for other people to access across the Web, simply by placing them on a public Web server.

You're probably already familiar with HTML (HyperText Markup Language)—it's the main language used to create Web pages, combining plain text with special tags that tell browsers how to treat that text. HTML is used to describe how different elements in a Web page should be displayed, how pages should be linked, where to put images, and so on.

Pure HTML documents, for all their versatility, are little more than static arrangements of text and pictures, albeit nicely presented ones. However, most of the sites you find on the Web aren't static but dynamic, even interactive. They can show you a list of articles containing a particular word in which you're interested, show you the latest news, even greet you by name when you log on. They enable you to interact, and present you with different information according to the choices you make.

You can't build a Web site like that using raw HTML, and that's where PHP comes in. What sort of things can you do with it? Well, you can program sites that

* Present data from a wide variety of sources, such as databases, files, or even other Web pages.
* Incorporate interactive elements, such as search facilities, message boards, and straw polls.
* Enable the user to perform actions, such as sending e-mail or buying something.

In other words, PHP can be used to write the sort of sites that those who regularly use the Web are likely to encounter every day. From search engines to information portals to e-commerce sites, most

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