Memcached::prepend

    (PECL memcached >= 0.1.0)

    Memcached::prepend — Prepend data to an existing item

    Description

    public Memcached::prepend(string $key, string $value): ?bool

    Memcached::prepend() prepends the given value string to the value of an existing item. The reason that value is forced to be a string is that prepending mixed types is not well-defined.

    Note:

    If the Memcached::OPT_COMPRESSION is enabled, the operation will fail and a warning will be issued, because prepending compressed data to a value that is potentially already compressed is not possible.

    Parameters

    key

    The key of the item to prepend the data to.

    value

    The string to prepend.

    Return Values

    Returns true on success or false on failure. Returns null when compression is on.

    Errors/Exceptions

    Returns null and raises an E_WARNING when compression is enabled.

    Examples

    Example #1 Memcached::prepend() example

    <?php
    $m     = new Memcached();
    $m->addServer('localhost', 11211);
    $m->setOption(Memcached::OPT_COMPRESSION, false);

    $m->set('foo', 'abc');
    $m->prepend('foo', 'def');
    var_dump($m->get('foo'));
    ?>

    The above example will output:

    string(6) "defabc"

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