Configuring Include Paths
Include paths are used for holding third-party code that is used for completion and reference resolution in some functions/methods that use file paths as arguments, for example, require() or include().
Note that the files added via include paths are not meant to be edited within the scope of you project. If you have the existing code that you need to access and modify from within several projects, consider adding it via an additional content root.
Configure include paths
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Do one of the following:
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To configure the include paths for the current project, in the Settings/Preferences dialog (Ctrl+Alt+S), click PHP under Languages & Frameworks.
To configure the include paths that will be applied to all newly created projects, use the Default settings ().
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On the PHP page that opens, configure the list of include paths on the Include path tab:
Use
and 
to add and remove paths. Use
and 
to reorder the items in the list. Click
to have the paths sorted alphabetically in the ascending order.