5f71d8ac_torm_9_0_0_Help____Directories__Tooltip
[Description] Click this button to mark the selected folder as the root for namespaces used in your project. Based on this setting, PhpStorm suggests you 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. See Configuring PHP Namespaces in a Project for details. [Tooltip] 
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PhpStorm 9.0.0 Help :: Directories