Facebook has presented
Hack – a new programming language based on the PHP syntax and intended for implementation with HHVM
(HipHop Virtual Machine). Applications written on Hack can seamlessly interact and go with an existing code written on PHP, as the HHVM environment supports the implementation of unmodified PHP scripts. The Hack code is distributed under a free PHP license. The realisation of the language has already been tested in commercial operation; Facebook, in particular, has already changed to Hack and translated practically all the code of its PHP projects into Hack.
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