"That doesn't make any sense. Anything that can run node.js can also run erlang, so let's use some erlang code inside node.js, right?" Sounds right from a Turi

"That doesn't make any sense. Anything that can run node.js can also run erlang, so let's use some erlang code inside node.js, right?" Sounds right from a Turing perspective, but probably not from a pratical point of view. There are tons of services that provide PHP hosting, but you probably need a root server for Erlang. All services that run Node.js (except Node.Js specific services like Joyent) are probably root serves and so can run PHP.