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    Zookeeper::exists

    (PECL zookeeper >= 0.1.0)

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

    Descrizione

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

    Elenco dei parametri

    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

    Valori restituiti

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

    Errori/Eccezioni

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

    Attenzione

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

    Esempi

    Example #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';
    ?>

    Il precedente esempio visualizzerà:

    EXISTS

    Vedere anche:

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