Attach an SplObserver

# SplSubject::attach

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplSubject::attach — Attach an SplObserver

### 说明

public function SplSubject::attach(SplObserver `$observer`): void

Attaches an SplObserver so that it can be notified of updates.

警告

本函数还未编写文档，仅有参数列表。

### 参数

`observer`

  The SplObserver to attach.

### 返回值

没有返回值。

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open