During a recent upgrade of the IDE it seems like the caches used for
providing code completion got corrupted. This little tip will help you fix
that.
Also applies to: WebStorm
Docs
Cleaning System Cache (https://www.jetbrains.com/phpstorm/help/cleaning-system-cache.html)
Questions/Comments/Suggestions
@PhpStormBriefs (https://twitter.com/phpstormbriefs)