Zookeeper::get
(PECL zookeeper >= 0.1.0)
Zookeeper::get — Gets the data associated with a node synchronously
说明
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.
Since version 0.3.0, this method emits ZookeeperException and it's derivatives.
示例
示例 #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';
?>以上示例会输出：
nodevalue
示例 #2 Zookeeper::get() stat example
Get node stat info.
<?php
$zookeeper = new Zookeeper('localhost:2181');
$path = '/path/to/node';
$stat = [];
$zookeeper->get($path, null, $stat);
var_dump($stat);
?>以上示例会输出：
array(11) {
["czxid"]=>
float(0)
["mzxid"]=>
float(0)
["ctime"]=>
float(0)
["mtime"]=>
float(0)
["version"]=>
int(0)
["cversion"]=>
int(-2)
["aversion"]=>
int(0)
["ephemeralOwner"]=>
float(0)
["dataLength"]=>
int(0)
["numChildren"]=>
int(2)
["pzxid"]=>
float(0)
}
参见
- Zookeeper::set() - Sets the data associated with a node
- ZookeeperException