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
    }

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