PHP-Handbuch: Decrement numeric item's value

Beschreibung

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

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.

Parameter-Liste

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.

Rückgabewerte

Returns item's new value on successIm Fehlerfall wird FALSE zurückgegeben..

Beispiele

Beispiel #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);
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

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

Siehe auch

Memcached::increment
Memcached::incrementByKey
Memcached::decrementByKey