The SplSubject interface

(PHP 5 >= 5.1.0, PHP 7)

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

SplSubject {

/* 锟斤拷锟斤拷 */

abstract public attach ( SplObserver $observer ) : void

abstract public detach ( SplObserver $observer ) : void

abstract public notify ( void ) : void

}