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PHP Manual [The SplObserver interface]

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PHP Manual || Miscellaneous Classes and Interfaces

(PHP 5 >= 5.1.0, PHP 7)

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

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


PHP Manual || Miscellaneous Classes and Interfaces