= 2.0.0)Memcached::decrementByKey — Decrement numeric item's value, stored on a specific server說(shuō)明public Memc">

Memcached::decrementByKey

(PECL memcached >= 2.0.0)

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

說(shuō)明

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

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.

參數(shù)

server_key

本鍵名用于識(shí)別儲(chǔ)存和讀取值的服務(wù)器。沒有將實(shí)際的鍵名散列到具體的項(xiàng)目，而是在決定與哪一個(gè) memcached 服務(wù)器通信時(shí)將其散列為服務(wù)器鍵名。這使得關(guān)聯(lián)的項(xiàng)目在單一的服務(wù)上被組合起來(lái)以提高多重操作的效率。

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 或者在失敗時(shí)返回 false.

參見