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    Zookeeper::exists

    (PECL zookeeper >= 0.1.0)

    Zookeeper::exists — Checks the existence of a node in zookeeper synchronously

    Descrição

    public Zookeeper::exists(string $path, callable $watcher_cb = null): array

    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. The watch will be set even if the node does not

    Valor Retornado

    Returns the value of stat for the path if the given node exists, otherwise false.

    Erros/Exceções

    This method emits PHP error/warning when parameters count or types are wrong or fail to check the existence of a node.

    Cuidado

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

    Exemplos

    Exemplo #1 Zookeeper::exists() example

    Check the existence of a node.

    <?php
    $zookeeper     = new Zookeeper('locahost:2181');
    $path = '/path/to/node';
    $r = $zookeeper->exists($path);
    if (    $r)
    echo     'EXISTS';
    else
    echo     'N/A or ERR';
    ?>

    O exemplo acima produzirá:

    EXISTS

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