The SplSubject interface

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

Introduction

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

Interface synopsis

interface SplSubject {

/* Methods */

public attach(SplObserver $observer): void

public detach(SplObserver $observer): void

public notify(): void

}

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

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