Zookeeper::get
(PECL zookeeper >= 0.1.0)
Zookeeper::get — Gets the data associated with a node synchronously
Description
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
