Domain redirection script

I need a PHP script that will detect the website requested and based on this forward on to another site. For example. [login to view URL] redirects to [login to view URL] [login to view URL] redirects to [login to view URL] Someone visits [login to view URL] this PHP script will redirect to [login to view URL] I need to be able to populate the list of domains and the domains that it will forward to. I would like the option to cloak the domain. e.g. the site shows [login to view URL] but loads content of [login to view URL] The administration side of this script needs to be password protected. I want to host this under one domain for all redirects. Thank you for your time.