# SplObserver # [SplObserver interface](https://www.php.net/manual/zh/class.splobserver.php "SplObserver") > SplObserver接口与SplSubject一起用于实现Observer观察者设计模式。 ## **方法：** ``` <pre class="calibre10">``` SplObserver <span class="token3">{</span> <span class="token">/* 方法 */</span> abstract public update <span class="token3">(</span> SplSubject $subject <span class="token3">)</span> <span class="token3">:</span> void <span class="token">//接收被观察者更新</span> <span class="token3">}</span> ``` ``` ## **例子：**