(PECL memcached >= 0.1.0)
Memcached::appendByKey — Append data to an existing item on a specific server
Memcached::appendByKey() is functionally equivalent to Memcached::append, except that the free-form server_key can be used to map the key to a specific server.
The key identifying the server where the item is.
The key of the item to append the data to.
The string to append.
Returns TRUE on success or FALSE on failure. The Memcached::getResultCode will return Memcached::RES_NOTSTORED if the key does not exist.