# Zookeeper::setWatcher

(PECL zookeeper >= 0.1.0)

Zookeeper::setWatcher — Set a watcher function

### 说明

public Zookeeper::setWatcher(callable `$watcher_cb`): bool

### 参数

`watcher_cb`

  A watch will be set at the server to notify the client if the node changes.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 错误／异常

This method emits PHP error/warning when parameters count or types are wrong or fail to set watcher.

警告

Since version 0.3.0, this method emits ZookeeperException and it's derivatives.

### 参见

- Zookeeper::exists() - Checks the existence of a node in zookeeper synchronously
- Zookeeper::get() - Gets the data associated with a node synchronously
- ZookeeperException

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