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AFAIK it's not true. First they don't use raw php: https://github.com/facebook/xhp/wiki

Then they use it only for the view layer, it only pull some data from memcache to render HTML.

But all the hard work is C++ / Java / Tornado / etc



Correct me if I am wrong, but very few large scale project (if any at all) use raw PHP. Most of them rely on some kind of framework. Besides FB said it themselves that large portion of their code is PHP.


Well, that would presumably mean that the bulk of their code is view code. Which, by line count, probably makes sense.




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