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Miscellaneous Classes and Interfaces
PHP Manual

The SplObserver interface

(PHP 5 >= 5.1.0, PHP 7)

Introduction

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

Interface synopsis

SplObserver {
/* Methods */
abstract public void update ( SplSubject $subject )
}

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Miscellaneous Classes and Interfaces
PHP Manual