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An Introduction to PHP
The past five years have been fantastic in terms of the explosive growth of the Internet and the new ways in which people are able to communicate with one another. Spearheading this phenomenon has been the World Wide Web (WWW), with thousands of new sites being launched daily and consumers being consistently offered numerous outstanding services via this new communications medium. With this exploding market has come a great need for new technologies and developers to learn these technologies. Chances are that if you are reading this paragraph, you are one of these Web developers or are soon to become one. Regardless of your profession, you’ve picked this book up because you’ve heard of the great new technology called PHP.

This chapter introduces the PHP language, discusses its history and capabilities, and provides the basic information you need to begin developing PHPenabled sites. Several examples are provided throughout, hopefully serving to excite you about what PHP can offer you and your organization. You will learn how to install and configure the PHP software on both Linux/UNIX and Windows machines, and you will learn how to embed PHP in HTML. At the conclusion of the chapter, you will be ready to begin delving into the many important aspects of the PHP language. So light the fire, turn on your favorite jazz album, and curl up on the lazyboy; you are about to learn what will be one of the most exciting additions to your resume: PHP programming.

An Abbreviated History
PHP set its roots in 1995, when an independent software development contractor named Rasmus Lerdorf developed a Perl/CGI script that enabled him to know how many visitors were reading his online resume. His script performed two duties: logging visitor information and displaying the count of visitors to the Web page. Because the WWW as we know it today was still so young at that time, tools such as these were nonexistent, and they prompted emails inquiring about Lerdorf’s scripts. Lerdorf thus began giving away his toolset, dubbed Personal Home Page (PHP), or Hypertext Preprocessor.

The clamor for the PHP toolset prompted Lerdorf to begin developing additions to PHP, one of which converted data entered in an HTML form into symbolic variables that allowed for their export to other systems. To accomplish this, he opted to continue development in C code rather than Perl. This addition to the existing PHP toolset resulted in PHP 2.0, or PHP-FI (Personal Home Page—Form Interpreter). This 2.0 release was accompanied by a number of enhancements and improvements from programmers worldwide.

The new PHP release was extremely popular, and a core team of developers soon formed. They kept the original concept of incorporating code directly alongside HTML and rewrote the parsing engine, giving birth to PHP 3.0. By the 1997 release of version 3.0, over 50,000 users were using PHP to enhance their Web pages. Development continued at a hectic pace over the next two years, with hundreds of functions being added and the user count growing in leaps and bounds. At the onset of 1999, Netcraft (http://www.netcraft.com) reported a conservative estimate of a user base surpassing 1,000,000, making PHP one of the most popular scripting languages in the world.

Early 1999 saw the announcement of the upcoming PHP 4.0. Although one of PHP’s strongest features was its proficiency at executing scripts, the developers had not intended that large-scale applications were going to be built using PHP. Thus they set out to build an even-more robust parsing engine, better known as Zend . Development continued rapidly, culminating in the May 22, 2000, release of PHP 4.0.


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