PHP, which is an acronym for PHP: Hypertext Preprocessor, is amongst the most famous open-source programming languages out there. Any website or application built on PHP will run on a given server as long as a PHP module is activated, which renders the language really universal and it isn’t a big surprise that there are actually several million web servers that support it and hundreds of millions of PHP-powered sites running on them. What makes PHP preferred over HTML is the fact that it permits you to develop a responsive site with lots of features. A PHP-based community website, for instance, will serve different content to each visitor in spite of the fact that the URL won’t change. In contrast, HTML websites are static and the page content can be edited only manually. Like any other software, PHP has several versions and the one that was used whilst creating a particular website must be installed on the server in order for the site to work flawlessly.