Memcached::decrement

(PECL memcached >= 0.1.0)

Memcached::decrement — Decrement numeric item's value

说明

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

Memcached::decrement() decrements a numeric item's value by the specified offset . If the item's value is not numeric, it is treated as if the value were 0. If the operation would decrease the value below 0, the new value will be 0. Memcached::decrement() will fail if the item does not exist.

参数

key: The key of the item to decrement.
offset: The amount by which to decrement the item's value; defaults to 1.

返回值

如果成功则返回 TRUE，失败则返回 FALSE。 The Memcached::getResultCode will return Memcached::RES_NOTFOUND if the key does not exist.

范例

Example #1 Memcached::decrement() example


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

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

$m->decrement('counter', 10);
var_dump($m->get('counter'));
?>

上例将输出：

int(4)
int(0)

参见

Memcached::increment - Increment numeric item's value