Zookeeper
PHP Manual

Zookeeper::exists

(PECL zookeeper >= 0.1.0)

Zookeeper::exists — Checks the existence of a node in zookeeper synchronously

Description

public bool Zookeeper::exists ( string $path [, callable $watcher_cb = NULL ] )

Liste de paramètres

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

Valeurs de retour

Returns true/false on success, and false on failure.

Erreurs / Exceptions

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

Attention

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

Exemples

Exemple #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';
?>

L'exemple ci-dessus va afficher :

EXISTS

Voir aussi

Zookeeper
PHP Manual