I've read about people who use workarounds on the Cedar stack for different purposes. Did you think about running two different heroku instances for the same app? With both on instances on Cedar stack, one instance can be running the rails part while the other instance runs the php.
I just read the DotCloud docs and they do a lot of stuff including php and ruby, you might want to check them out to see if they run both in the same instance.
Interesting. I'll check out the ability to run two different heroku instances for the same app to see if that can help. If you could point me to any literature on the subject it would be very much appreciated.
I'll ckeckout DotCloud as well. Thanks for the heads up!
It was actually really easy with this: https://github.com/mhoofman/wordpress-heroku
But unfortuently, to the best of my knowledge, you can't host both PHP at the same time as Rails.
If anyone know otherwise I would love to hear!