If you are still using a version from 2019 or earlier, upgrading to the 2020 branch (specifically 2020.3) was, and remains, a mandatory upgrade for a modern workflow.
The IDE added better support for running specific test methods directly from the gutter and introduced an integrated code coverage viewer that highlighted untested lines in red directly in the editor. 4. Frontend and Database Power-ups phpstorm 2020
With the introduction of $variable: string|int , PhpStorm’s type inference engine was rebuilt to handle multiple types, reducing "undefined method" false positives. If you are still using a version from