PHPStorm 2021.1 is no longer aware of built-in functions
With the latest update, PHPStorm on Windows 10 has lost the ability to tell me about all the built-in functions,

and now sees these as missing language features. I get a lightbulb on the sidebar asking me to import function
Which fails if I try it

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Hi there,
Please try "File | Invalidate Caches...", choose top 2 options there and restart IDE from that screen. Any better?
https://youtrack.jetbrains.com/issue/WI-54626
That seemed to have fixed the issue! Thank you Andriy