PHP, which is an acronym for PHP: Hypertext Preprocessor, is among the most commonly used multiparadigm programming languages out there. Any website or web app written in PHP will run on a given server as long as a PHP module is enabled, which makes the language really universal and it isn’t that unusual that there are actually a few million web servers that support it and hundreds of millions of PHP websites hosted on them. PHP is preferred over HTML because it enables you to develop a dynamic website with plenty of options. A PHP-based social networking site, for example, will show unique content to each user in spite of the fact that the page URL will remain unchanged. By contrast, HTML-based websites are static and the content on the pages can be edited only manually. Just like any other piece of software, PHP has different versions and the one that was used whilst creating a specific website must be installed on the server so that the site can run correctly.