Memcached::decrement
(PECL memcached >= 0.1.0)
Memcached::decrement — Decrement numeric item's value
Beschreibung
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.
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 successBei einem Fehler 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() - Increment numeric item's value
- Memcached::incrementByKey() - Increment numeric item's value, stored on a specific server
- Memcached::decrementByKey() - Decrement numeric item's value, stored on a specific server
