Use this dialog to configure content roots of a project.
Add Content Root
Click this button and select a new content root folder in the dialog that opens.
Remove Content Entry
Click this button to have the selected root removed from the list.
Click this button to mark the selected folder as a test root.
Click this button to mark the selected folder as the root for namespaces used in your project.
Based on this setting, PhpStorm suggests the proper folder name when you want to create a new namespace under another parent namespace during creation or moving a PHP class, that is, when you are actually creating or moving a PHP class to a non-existing namespace under another parent namespace. If no Sources folder is specified, you will have to type the proper folder manually.
Appointing a Sources folder is not mandatory but this helps you keep your project structure in compliance with the PSR0 and PSR4 standards. For more information, refer to Configure PHP namespaces in a project.
Click this button to mark the selected folder as excluded so PhpStorm ignores it during indexing, parsing, and code completion.
Click this button to enable PhpStorm to complete relative paths to resources under the selected folder.
In the Exclude files field, type the masks that define the names of files and folders to be excluded, for example,