Decrement numeric item's value

Descrizione

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.

Elenco dei parametri

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.

Valori restituiti

Returns item's new value on success o FALSE in caso di fallimento.

Esempi

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);
?>

Il precedente esempio visualizzerà:

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

Vedere anche:

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