PHP, which is a metacronym for PHP: Hypertext Preprocessor, is one of the most popular multi-paradigm programming languages that are available out there. Any website or app written in PHP will run on a given web server on the condition that a PHP module is enabled, which renders the language absolutely universal and it is barely a surprise that there are several million web servers that support it and 100s of millions of PHP-driven sites hosted on them. PHP is preferred over HTML due to the fact that it allows you to build a dynamic website with an immense number of features. A PHP-based community web portal, for example, will display different content to each visitor irrespective of the fact that the page URL will stay unchanged. On the other hand, HTML sites are static and the page content can be edited only manually. Like any other piece of software, PHP has different versions and the one that was used while creating a certain website must be installed on the server so that the site can run correctly.