"; } } class Bar { public function __construct($arg) { } public function Hi($name) { echo "Hi $name
"; } } (new Foo())->Hi("Bob"); (new Foo)->Hi("Fred"); (new Bar("some arg value"))->Hi("Jane"); require_once 'House.php'; use \Property\House; // 1. Bad approach /* $house = new House(); $house->LockUp(); */ // 2. Better approach /* require_once 'Kitchen.php'; require_once 'Door.php'; require_once 'Window.php'; use \Property\Kitchen; use \Property\Door; use \Property\Window; $house = new House( new Kitchen( new Door(), [ new Window(), new Window() ] ) ); $house->LockUp(); */ // Dependency Injection. // ===================== // We can test the House like this without having to test // the Kitchen, Door and Window classes, because we can // inject a MockKitchen object into the House and focus // on testing just the House code. require_once 'MockKitchen.php'; use \Property\MockKitchen; $house = new House(new MockKitchen()); $house->LockUp(); // 3. Best approach from the application perspective is // to use an Builder. i.e. a separate class for building // the House. require_once 'HouseBuilder.php'; use \Property\HouseBuilder; // Use class member access on initialization to create // the house. $house = (new HouseBuilder())->Build(); $house->LockUp(); ?>