Zookeeper::exists

(PECL zookeeper >= 0.1.0)

Zookeeper::existsChecks the existence of a node in zookeeper synchronously

Descrizione

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

Elenco dei parametri

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

Valori restituiti

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

Errori/Eccezioni

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

Attenzione

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

Esempi

Example #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';
?>

Il precedente esempio visualizzerĂ :

EXISTS

Vedere anche:

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