PHP, which is a backronym for PHP: Hypertext Preprocessor, is amongst the most popular server-side scripting languages available out there. Any site or application created in PHP will run on a given server as long as a PHP module is installed, which renders the language absolutely universal and it’s not really that surprising that there are actually a few million servers that support it and hundreds of millions of PHP websites running on them. PHP is preferred over HTML because of the fact that it allows you to build a responsive site with a myriad of different features. A PHP-based social networking site, for instance, will display different web content to each user despite the fact that the page URL will be the same. In comparison, HTML websites are static and the page content itself can be updated only manually. Like any other software, PHP has different versions and the one that was used while setting up a given website must be configured on the web server in order for the site to run flawlessly.