The SplSubject interface

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

简介

The SplSubject interface is used alongside SplObserver to implement the Observer Design Pattern.

interface SplSubject {

/* 方法 */

public function attach(SplObserver $observer): void

public function detach(SplObserver $observer): void

public function notify(): void

}