The SplSubject interface

Introduction

(PHP 5 >= 5.1.0, PHP 7)

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

Interface synopsis

abstract public attach ( SplObserver $observer ) : void

abstract public detach ( SplObserver $observer ) : void

abstract public notify ( ) : void

Table of Contents

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