The SplSubject interface

Introduction

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

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

Interface synopsis

public attach(SplObserver $observer): void

public detach(SplObserver $observer): void

public notify(): void

Table of Contents

• SplSubject::attach — Attach an SplObserver
• SplSubject::detach — Detach an observer
• SplSubject::notify — Notify an observer