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SplObserver::update	SplSubject::attach

Interfaces	Last updated: Mon, 26 Oct 2026

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 function attach(SplObserver $observer): void

public function detach(SplObserver $observer): void

public function notify(): void

}

Table of Contents

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

SplObserver::update	SplSubject::attach

Interfaces	Last updated: Mon, 26 Oct 2026