[fat0wl]

I was implying that PHP wasn't doing any of the heavy business logic, but then I re-read some articles (most notably this one) & I'll admit I'm a bit confused.

https://developers.facebook.com/blog/post/2010/02/02/hiphop-...

I WAS referring to PHP as frontend, but based on the article it seems like there may be a lot more HipHop PHP than I suspected, because they mention that it would be too niche to write a ton of C++ code. However, there is this line which I think clarifies somewhat -- "HipHop allows us to write the logic that does the final page assembly in PHP and iterate it quickly while relying on custom back-end services in C++, Erlang, Java, or Python to service the News Feed, search, Chat, and other core parts of the site."

It seems like even though PHP is compiled & heavily utilized, it is still used mostly for page assembly on top of a Service-Oriented Architecture, with services written in C++, Erlang, Java, & Python.