如何集成nodeJS + Socket。IO和PHP吗?

I have recently been looking around, to find a good way to communicate between nodeJS and PHP. Here is the idea : nodeJS is still quite new, and it can be kind of tricky to develop a full application only with it. Moreover, you may need it only for one module of your project, like realtime notifications, chat, ... And you want to manage all the other stuff with PHP, because it is probably more easy for you (and you can take advantage of the existing frameworks, like CodeIgniter or Symfony).I have recently been looking around, to find a