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From the HipHop Homepage:

HipHop transforms your PHP source code into highly optimized C++ and then
compiles it with g++ to build binary files. You keep coding in simpler PHP,
then HipHop executes your source code in a semantically equivalent manner and
sacrifices some rarely used features - such as eval() - in exchange for
improved performance.

HipHop was developed by Facebook and was released as open source in early 2010.

Facebook sees about a 50% reduction in CPU usage when serving equal amounts
of Web traffic when compared to Apache and PHP. Facebook.s API tier can serve
twice the traffic using 30% less CPU.

WWW:	https://github.com/facebook/hiphop-php/wiki

END