Andrew Podner has a new post to his site today talking about platform as a service providers out there that offer PHP support. He mentions three different ones, but goes into more depth on getting a site set up with AppFog.
There are several options out there for PHP apps using this medium for deployment, and picking one is not always the easiest thing to do. The most interesting thing that I noticed about the various PaaS providers that I looked at was they way they differentiate their pricing models. [...] The PaaS providers do not make the choice nearly as simple [as VPS providers]. Each of them has different options to consider and different terminology that describes their particular product offering.
He briefly covers the offerings of three providers - Engine Yard/Orchestra, PagodaBox and AppFog. Its the final one he's most interested in, so he gets into the details and steps you'll need to create an account, set up an application and make your first push out to their platform. He also includes a hint on how to set up a .htaccess file if your application's document root is in something other than the base directory.