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
