Memcached::decrement

(PECL memcached >= 0.1.0)

Memcached::decrement — Decrement numeric item's value

Descrizione

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.

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

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User Contributed Notes 3 notes

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Pramod Patil ¶

10 years ago

decrement will not change TTL of the stored key/value.

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Pramod Patil ¶

10 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

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jbaginski ¶

11 years ago

PECL memcached < 0.2.0

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

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