(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 to store the value on.
The key under which to store the value.
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.