Php/docs/zookeeper.get
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 $r;else echo 'ERR';?>
以上例程会输出：
nodevalue
Example #2 Zookeeper::get() stat example
Get node stat info.
<?php$zookeeper = new Zookeeper('localhost:2181');$path = '/path/to/node';$stat = [];$zookeeper->get($path, null, $stat);var_dump($stat);?>
以上例程会输出：
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)
}
