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    Zookeeper::exists

    (PECL zookeeper >= 0.1.0)

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

    Beschreibung

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

    Parameter-Liste

    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

    Rückgabewerte

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

    Fehler/Exceptions

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

    Achtung

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

    Beispiele

    Beispiel #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';
    ?>

    Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

    EXISTS

    Siehe auch

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