Set a watcher function

# Zookeeper::setWatcher

(PECL zookeeper >= 0.1.0)

Zookeeper::setWatcher — Set a watcher function

### 説明

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

### パラメータ

`watcher_cb`

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

### 戻り値

成功した場合に `true` を、失敗した場合に `false` を返します。

### エラー / 例外

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 its derivatives.

### 参考

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

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