« ArrayObject::unserialize SplObserver::update » PHP Manual 各种类及接口 The SplObserver interface 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 update ( SplSubject $subject ) : void } Table of Contents SplObserver::update — Receive update from subject