(PECL memcached >= 0.1.0)
Retrieve an item from a specific server
public mixed Memcached::getByKey ( string $server_key, string $key [, callable $cache_cb [, float &$cas_token ]] )
Memcached::getByKey() is functionally equivalent to Memcached::get(), except that the free-form server_key can be used to map the key to a specific server.
Parameters:
server_key
The key