PHP, which is an initialism for PHP: Hypertext Preprocessor, is among the most popular object-oriented programming languages out there. Any website or Internet application created with PHP will run on a given server on the condition that a PHP module is installed, which makes the language truly universal and it is not really a big surprise that there are a couple of 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 enables you to create an interactive website with a multitude of different options. A PHP-based social networking website, for example, will serve unique web content to each user despite the fact that the page URL will not change. On the other hand, HTML sites are static and the page content can be updated only manually. Like any other software program, PHP has different versions and the version that was used while creating a particular website must be available on the server in order for the site to behave flawlessly.