By default, a site configured in IIS 6 will not support PHP. An extension mapping must be created so that IIS will know how to handle php scripts.
This assumes that PHP has been installed on the server in question.
1. Right-click on the site in question and choose Properties.
2. In the Properties box, click on Home Directory, and then Configuration
3. Under Application Extensions, click Add.
4. Either enter or browse to the PHP executable, php5isapi.dll.
5. Under extension, enter “.php”
You have the option to limit the HTML methods that PHP scripts will have access to. The limitations you impose depend on the security requirements of the client, but GET, HEAD, and POST should be enough for most PHP applications. Verbs should be separated by a comma, for example: GET,HEAD,POST
6. Save your changes, and restart IIS.
