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.

警告

Since version 0.3.0, this method emits ZookeeperException and it's derivatives.

范例

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';
?>

以上例程会输出：

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)
}

参见

Zookeeper::set() - Sets the data associated with a node
ZookeeperException

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官方地址：https://www.php.net/manual/en/zookeeper.get.php

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Zookeeper::get

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes