Zookeeper::get
(PECL zookeeper >= 0.1.0)
Zookeeper::get — Gets the data associated with a node synchronously
Description
public Zookeeper::get ( string $path [, callable $watcher_cb = null [, array &$stat = null [, int $max_size = 0 ]]] ) : string
Parameters
-
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.
Return Values
Returns the data on success, and false on failure.
Errors/Exceptions
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.
Examples
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'; ?>
The above example will output:
nodevalue
Example #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); ?>
The above example will output:
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) }
See Also
- Zookeeper::set() - Sets the data associated with a node
- ZookeeperException
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/zookeeper.get.php