Learning PHP: A Gentle Introduction

According to Netcraft, PHP overtook Microsoft's ASP as the most popular web scripting language back in the spring of 2002. And PHP has continued its explosive growth ever since. Today, when the Apache web server powers nearly 70% of all sites on the Internet and its closest competitor, Microsoft's IIS, has a market share of just over 20%, PHP is far and away the most widely used server-side scripting language. Just what is it that makes PHP so popular?

Pletcher, Thomas. Community MX. Articles>Web Design>Server Side Includes>PHP