Zookeeper::get

(PECL zookeeper >= 0.1.0)

Zookeeper::get — Gets the data associated with a node synchronously

说明

public Zookeeper::get ( string $path [, callable $watcher_cb = NULL [, array &$stat = NULL [, int $max_size = 0 ]]] ) : string

参数

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.
stat: If not NULL, will hold the value of stat for the path on return.
max_size: Max size of the data. If 0 is used, this method will return the whole data.

返回值

Returns the data on success, and false on failure.

错误／异常

This method emits PHP error/warning when parameters count or types are wrong or fail to get value from node.

Caution

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

范例

Example #1 Zookeeper::get() example

Get value from node.


<?php
$zookeeper = new Zookeeper('locahost:2181');
$path = '/path/to/node';
$value = 'nodevalue';
$zookeeper->set($path, $value);

$r = $zookeeper->get($path);
if ($r)
  echo $r;
else
  echo 'ERR';
?>

以上例程会输出：

nodevalue

参见

Zookeeper::set() - Sets the data associated with a node
ZookeeperException