PHP マニュアル: Checks the existence of a node in zookeeper synchronously

説明

public array Zookeeper::exists(string $path, callable $watcher_cb = null)

パラメータ

path: The name of the node. Expressed as a file name with slashes separating ancestors of the node.
watcher_cb: if nonzero, a watch will be set at the server to notify the client if the node changes. The watch will be set even if the node does not

戻り値

Returns the value of stat for the path if the given node exists, otherwise false.

エラー / 例外

This method emits PHP error/warning when parameters count or types are wrong or fail to check the existence of a node.

警告

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

例

例1 Zookeeper::exists example

Check the existence of a node.

<?php
$zookeeper = new Zookeeper('locahost:2181');
$path = '/path/to/node';
$r = $zookeeper->exists($path);
if ($r)
  echo 'EXISTS';
else
  echo 'N/A or ERR';
?>

上の例の出力は以下となります。

EXISTS

参考

Zookeeper::get
ZookeeperException