My PhpStorm 5 does not know php native functions

Question

I recently downloaded PhpStorm 5. Everything work fine with verion 4, but now I can not access to native php functions on autocomplete. Functions and classes declared in my

Answer 1

I solved same problem in my PhpStorm2020.2 by this command in linux:

on Linux, execute this command: rm -rf ~/.cache/JetBrains/PhpStorm2020.2/

on macOs: rm -rf ~/Library/Caches/JetBrains/PhpStorm2020.2/