(PECL memcached >= 0.1.0)
Memcached::prependByKey — Prepend data to an existing item on a specific server
Memcached::prependByKey() is functionally equivalent to Memcached::prepend(), except that the free-form server_key can be used to map the key to a specific server.
此键名标识存储值的服务器。
The key of the item to prepend the data to.
The string to prepend.
成功时返回 TRUE, 或者在失败时返回 FALSE. The Memcached::getResultCode() will return Memcached::RES_NOTSTORED if the key does not exist.