Zookeeper::get

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

说明

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

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.

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.