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Re:PDC 1996 Keynote with Bob Muglia and Steve Jobs [video] by cma on Sunday October 27, 2019 @08:52AM (#21369398)
But Facebook compiles PHP into C++ or something right (I think now they have a newer approach than c++)?

https://en.wikipedia.org/wiki/HipHop_for_PHP

Re:PDC 1996 Keynote with Bob Muglia and Steve Jobs [video] by rgoulter on Sunday October 27, 2019 @09:22AM (#21369521)
The top-of-my-head story is that PHP5 was quite slow, Facebook's HHVM was PHP-compatible and fast. PHP7 was competitively fast with Hack.

In terms of "performance needed for many users", Facebook doesn't use PHP (a "scripted language") for everything. etc.

Re:PDC 1996 Keynote with Bob Muglia and Steve Jobs [video] by lclarkmichalek on Sunday October 27, 2019 @09:23AM (#21369523)
It's a JIT compiler nowadays: https://github.com/facebook/hhvm/
Re:PDC 1996 Keynote with Bob Muglia and Steve Jobs [video] by saagarjha on Sunday October 27, 2019 @12:55PM (#21370870)
HHVM now mainly only targets Hack these days.