Controller class names are plural.
Controller class names are Capitalized for single-word controllers, and UpperCamelCased for multi-word controllers. Controller class names also end with 'Controller'.
Examples: PeopleController, MonkeysController, GlassDoorsController, LineItemsController, ReallyNiftyThingsController
Controller file names use a lower-case underscored syntax. Controller file names also end with '_controller'
Examples: people_controller.php, monkeys_controller.php, glass_doors_controller.php, line_items_controller.php, really_nifty_things_controller.php