PHP オブジェクト指向プログラミングのデザイン パターンを探索する

class Singleton { private static $instance; private function __construct() {} public static function getInstance() { if (!self::$instance) { self::$instance = new self(); } return self::$instance; } } $singletonInstance = Singleton::getInstance();

class Product { private $name; public function __construct($name) { $this->$name = $name; } public function getName() { return $this->$name; } } class ProductFactory { public static function createProduct($name) { return new Product($name); } } $product = ProductFactory::createProduct("Example"); echo $product->getName();

class Subject implements SplSubject { private $observers = array(); private $data; public function attach(SplObserver $observer) { $this->observers[] = $observer; } public function detach(SplObserver $observer) { $key = array_search($observer, $this->observers); if ($key !== false) { unset($this->observers[$key]); } } public function notify() { foreach ($this->observers as $observer) { $observer->update($this); } } public function setData($data) { $this->data = $data; $this->notify(); } public function getData() { return $this->data; } } class Observer implements SplObserver { private $id; public function __construct($id) { $this->id = $id; } public function update(SplSubject $subject) { echo "Observer " . $this->id . " notified with data: " . $subject->getData() . " "; } } $subject = new Subject(); $observer1 = new Observer(1); $observer2 = new Observer(2); $subject->attach($observer1); $subject->attach($observer2); $subject->setData("Example data");