PHP
PHP (Hypertext Pre-Processor) is a server-side scripting language used to create dynamic web content. PHP scripts can be embedded in HTML code and uses similar syntax to the Perl and C programming languages.
Ubuntu Linux
Your 123-reg Ubuntu dedicated server comes fully installed with versions 4 and 5 of PHP, with Smarty PHP templating system. Your server also comes with many popular PEAR modules, such as DB, Mail, XML_RPC, XML_Parser, and HTTP_Request, included and PEAR client for adding further PEAR and PECL extensions.
Windows
Your 123-reg Windows dedicated server comes fully installed with PHP version 4