各种类及接口
PHP Manual

The SplObserver interface

(PHP 5 >= 5.1.0, PHP 7)

简介

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

接口摘要

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

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各种类及接口
PHP Manual