PHP, which is a recursive backronym for PHP: Hypertext Preprocessor, is one of the most popular general-purpose web programming languages available out there. Any website or application created using PHP will run on a given server provided that a PHP module is installed, which renders the language absolutely universal and it isn’t surprising that there are actually several million web servers that support it and 100s of millions of PHP sites running on them. PHP is preferred over HTML thanks to the fact that it enables you to create an interactive website with tons of different features. A PHP-based community web portal, for example, will show different content to each user despite the fact that the page URL will stay the same. By contrast, HTML-based websites are static and the page content can be updated only manually. Like any other software program, PHP has several versions and the one that was used whilst building a given website must be configured on the server so that the site can run correctly.