Memcached::decrementByKey

(PECL memcached >= 2.0.0)

Memcached::decrementByKey — Decrement numeric item's value, stored on a specific server

说明

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

Memcached::decrementByKey() 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::decrementByKey() will set the item to the initial_value parameter if the key doesn't exist.

参数

server_key: 此键名标识存储值的服务器。
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.

返回值

Returns item's new value on success 或者在失败时返回 FALSE.

参见

Memcached::decrement() - 减小数值元素的值
Memcached::increment() - 增加数值元素的值
Memcached::incrementByKey() - Increment numeric item's value, stored on a specific server