Zookeeper::exists

(PECL zookeeper >= 0.1.0)

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

Descripción

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

Parámetros

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

Valores devueltos

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

Errores/Excepciones

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

Precaución

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

Ejemplos

Ejemplo #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';
?>

El resultado del ejemplo sería:

EXISTS

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