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SeekableIterator::seek	SplObserver::update

Interfaces	Last updated: Mon, 26 Oct 2026

The SplObserver interface

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

Introduction

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

Interface synopsis

interface SplObserver {

/* Methods */

public function update(SplSubject $subject): void

}

Table of Contents

SplObserver::update — Receive update from subject

SeekableIterator::seek	SplObserver::update

Interfaces	Last updated: Mon, 26 Oct 2026