CodeIgniter 4.0.0-rc.1 released

Can this version be used in production?

Officially, no.
Unofficially, many are already.

Here's a Power User, Johan van der Merwe, who wrote in 2016(!!), "CodeIgniter 4 PRE-ALPHA - A Complete New Ballgame!", that he was already using it to build REST-based applications!

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Thanks CI4 Dev Team!

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(Using CodeIgniter since 1.x)