Can phpstorm suggest variables from included files?

Question

I have included some files in my php script using include and I am using variables and functions defined in my included files. Is there any way to configure PhpStorm in such way to show this kind of variables in the suggestions list?

Answer 1

Edit Dec 2021: (version 2021.2.3): option is now called "Search for variable's definition outside the current file"

Edit Jan 2021: (version 2020.1.1): option is now called "Report in files containing include statements"

Make sure the "Ignore 'include' and 'require' statements" option is unchecked in the Editor > Inspections > Undefined Variable. After doing this you will have auto-complete variables.

Annoyingly this doesn't give you type information about those variables, even if they're defined with accompanying PHPDoc.