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> Slack uses PHP for most of its server-side application logic […].

Slack migrated to Hacklang in 2016 [1].

[1] https://slack.engineering/hakana-taking-hack-seriously/ "We started migrating to a different language called Hack in 2016."

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Isn't Hack basically compiled PHP so that it is faster for FB's use case? I understand it's not technically PHP, but I imagine it is effectively still PHP, or is it more like what C++ is to C?

I understand PHP is fast adding any actual language features that Hack has over it?

At one point it was, but since then it’s become it’s own language with a completely new (JIT-based) implementation

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