Any folder which name ends with ".lib" within the open project is not shown under project folders list.
How to reproduce:
- Create folders of the following structure in your filesystem:
- Try to create a project from "project1" folder File -> Open Directory
- You can see folders in your newly created PhpStorm project
- No folders are shown under root "project1" folder
UPD: While this forum was submitting this post, I created a bug http://youtrack.jetbrains.net/issue/WI-9236