HHVM

Definitions

1. The HipHop Virtual Machine — a JIT-compiling virtual machine created by Facebook to execute PHP and Hack code with dramatically better performance than the standard PHP interpreter. Led to the creation of the Hack language.

   In plain English: Facebook's faster engine for running PHP code, which compiles it on the fly instead of interpreting it line by line, eventually leading to a whole new programming language called Hack.

   Example: "Facebook built HHVM because standard PHP was too slow for a billion users, then basically forked the language into Hack."

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