#27160
Single quote, double quote, or no quote? This seemingly simple question is often asked by those new to PHP. Suprisingly, however, some of those who claimed to be PHP programmer also can't tell the difference. It's very simple, really.
DevBay (2005). Articles>Web Design>Server Side Includes>PHP
#27553
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
#28277
PHP is Approaching the End of Its Life Cycle 
PHP while not the top programming language does dominate the web. It is seen as being easy to learn and can be used on any webserver. So PHP is gaining popularity by leaps. But PHP is also approaching the end of its development life cycle. The language itself is close to the point where it can no longer grow. When you look at PHP6 you can see the trend in development is turning towards cleaning up. This is a sure sign that things are close to being finished. That and the fact that all new features have been passed over.
Hiveminds (2006). Articles>Web Design>Server Side Includes>PHP
#33880
PHP is an interpreted language. This means that each time a PHP generated page is requested, the server must read in the various files needed and "compile" them into something the machine can understand (opcode). A typical Drupal page requires more than a dozen of these bits of code be compiled. Opcode cache mechanisms preserve this generated code in cache so that it need only be generated a single time to server hundreds or millions of subsequent requests. Enabling opcode cache will reduce the time it takes to generate a page by up to 90%.
Slaughter, Harry. DevBee (2006). Articles>Web Design>Server Side Includes>PHP
#35479
Fifty Extremely Useful PHP Tools
PHP is one of the most widely used open-source server-side scripting languages that exist today. With over 20 million indexed domains using PHP, including major websites like Facebook, Digg and WordPress, there are good reasons why many Web developers prefer it to other server-side scripting languages, such as Python and Ruby. This post presents 50 useful PHP tools that can significantly improve your programming workflow. Among other things, you’ll find a plethora of libraries and classes that aid in debugging, testing, profiling and code-authoring in PHP.
Gube, Jacob. Smashing (2009). Articles>Web Design>Server Side Includes>PHP
