PHP Compatibility and Hosting Quick-Install Applications
PHP is a popular and simple server scripting language that enables Web developers to embed dynamic content into Web pages. PHP 5 is enabled for all Linux hosting accounts. PHP 5 is enabled for Windows hosting accounts running IIS 7, only.
For information on migrating an existing hosting account, see Switching your hosting account operating system.
In IIS 7, GoDaddy Hosting Connection applications requiring PHP 5 can not be installed on sub-domains or aliased domains which point to sub-directories.