PHP, which is a meta-acronym for PHP: Hypertext Preprocessor, is one of the most commonly used curly-brace programming languages out there. Any site or web application built with PHP will run on a given server provided that a PHP module is enabled, which renders the language truly universal and it is little wonder that there are several million web servers that support it and 100s of millions of PHP websites hosted on them. PHP is preferred over HTML because of the fact that it permits you to set up an interactive site with an abundance of options. A PHP-based community website, for instance, will show unique web content to each visitor regardless of the fact that the URL will not change. On the other hand, HTML-based sites are static and the page content itself can be modified only manually. Just like any other software, PHP has different versions and the version that was used whilst creating a certain website must be enabled on the web server in order for the site to work faultlessly.