Я считаю, что эти два шаблона похожи (и большинство других моделей поведения)
шаблон посетителя,
interface Visitor { public function visit(Visitable $Visitable); } interface Visitable { public function accept(Visitor $Vsitor); } class ConcreteVisitable implements Visitable { public $items = array(); public function addItem($item) { $this->items[] = $item; } public function accept(Visitor $Vsitor) { $Vsitor->visit($this); } } class ConcreteVisitor implements Visitor { protected $info; public function visit(Visitable $Visitable) { echo "Object: ", get_class($Visitable), " <br/>"; $items = get_object_vars($Visitable)['items']; foreach ($items as $index => $value) { echo $index . ": ", $value, " <br/>"; } } } // Usage example $ConcreteVisitable = new ConcreteVisitable(); $ConcreteVisitor = new ConcreteVisitor(); $ConcreteVisitable->addItem('item 1'); $ConcreteVisitable->addItem('item 2'); $ConcreteVisitable->addItem('item 3'); $ConcreteVisitable->accept($ConcreteVisitor); образ слуги,
// Servant. interface Servant { // } // Servable. AKA Boss/ Master/ Authority interface Servable { // } // Concrete Servable. class ConcreteServable implements Servable { private $position; public function setPosition($position) { $this->position = $position . '<br/>'; } public function getPosition() { return $this->position; } } // Concrete Servant. class ConcreteServant implements Servant { // Method, which will move Servable implementing class to position where. public function moveTo(Servable $Servable, $arg) { // Do some other stuff to ensure it moves smoothly and nicely, this is // the place to offer the functionality. $Servable->setPosition($arg); } } $ConcreteServable = new ConcreteServable(); $ConcreteServant = new ConcreteServant(); $ConcreteServant->moveTo($ConcreteServable, 10); echo $ConcreteServable->getPosition(); $ConcreteServant->moveTo($ConcreteServable, 20); echo $ConcreteServable->getPosition();
Можете ли вы рассказать о различиях между ними? (если не указан пример шаблона слуг?)