Zookeeper::get

(PECL zookeeper >= 0.1.0)

Zookeeper::getGets the data associated with a node synchronously

Descrição

public Zookeeper::get(
    string $path,
    callable $watcher_cb = null,
    array &$stat = null,
    int $max_size = 0
): string

Parâmetros

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.

Valor Retornado

Returns the data on success, and false on failure.

Erros

This method emits PHP error/warning when parameters count or types are wrong or fail to get value from node.

Cuidado

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

Exemplos

Exemplo #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';
?>

O exemplo acima irá imprimir:

nodevalue

Exemplo #2 Zookeeper::get() stat example

Get node stat info.

<?php
$zookeeper 
= new Zookeeper('localhost:2181');
$path '/path/to/node';
$stat = [];
$zookeeper->get($pathnull$stat);
var_dump($stat);
?>

O exemplo acima irá imprimir:

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)
}

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