PhpStorm 2020.2 – PHP Built-in functions are not recognized

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It’s a known issue. AFAIK there is still no solid idea on why it happens and why only some users are affected.

https://youtrack.jetbrains.com/issue/WI-54626 — watch this ticket (star/vote/comment) to get notified on any progress. Fixed in PhpStorm 2021.1.1 version.

Current workaround:

  1. Close IDE
  2. Locate folder where PhpStorm 2020.2 stores indexes/caches on your computer (see below)
  3. Delete that folder (as standard “Invalidate caches” does not help here)
  4. Launch IDE

Typical locations for caches folder for different OS:

  • Windows: %USERPROFILE%\AppData\Local\JetBrains\PhpStorm2020.2\caches
  • Linux: ~/.cache/JetBrains/PhpStorm2020.2/caches
  • macOS: ~/Library/Caches/JetBrains/PhpStorm2020.2/caches

For 2021.1 version: use File | Invalidate Caches... — it now better clears them so no need to delete such folders manually.

  1. File | Invalidate Caches...
  2. Select top 2 options (maybe only 1st will be enough, but better use both)
  3. Use Invalidate and Restart button there
  4. After the IDE will restart, open the project and let re-indexing to complete.

enter image description here

If the issue persists (i.e. comes back the next day / after restart) then it’s a different cause and you will have to wait for 2021.1.1 build.

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