Memcached::decrement

    (PECL memcached >= 0.1.0)

    Memcached::decrement — Decrement numeric item's value

    Description

    public Memcached::decrement(
        string $key,
        int $offset = 1,
        int $initial_value = 0,
        int $expiry = 0
    ): int|false

    Memcached::decrement() decrements a numeric item's value by the specified offset. If the item's value is not numeric, an error will result. If the operation would decrease the value below 0, the new value will be 0. Memcached::decrement() will set the item to the initial_value parameter if the key doesn't exist.

    Parameters

    key

    The key of the item to decrement.

    offset

    The amount by which to decrement the item's value.

    initial_value

    The value to set the item to if it doesn't currently exist.

    expiry

    The expiry time to set on the item.

    Return Values

    Returns item's new value on success or false on failure.

    Examples

    Example #1 Memcached::decrement() example

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

    $m->set('counter', 5);
    $n = $m->decrement('counter');
    var_dump($n);

    $n = $m->decrement('counter', 10);
    var_dump($n);

    var_dump($m->get('counter'));

    $m->set('counter', 'abc');
    $n = $m->increment('counter');
    // ^ will fail due to item value not being numeric
    var_dump($n);
    ?>

    The above example will output:

    int(4)
int(0)
int(0)
bool(false)

    See Also

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    User Contributed Notes 3 notes

    up
    18
    Pramod Patil
    9 years ago
    decrement will not change TTL of the stored key/value.
    up
    11
    Pramod Patil
    9 years ago
    Found possible bug :
    decrement fails and returns -1 when memcached::OPT_BINARY_PROTOCOL is set to true.

    tested on PECL Memcached 2.1.0 and libmemcached version 1.0.8
    up
    0
    jbaginski
    11 years ago
    PECL memcached < 0.2.0

    public int Memcached::decrement ( string $key [, int $offset = 1 ] )
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