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.
The key identifying the server to store the value on or retrieve it from. Instead of hashing on the actual key for the item, we hash on the server key when deciding which memcached server to talk to. This allows related items to be grouped together on a single server for efficiency with multi operations.
The key of the item to fetch.
Read-through caching callback or NULL
The variable to store the CAS token in.
Returns the value stored in the cache or FALSE
otherwise. The Memcached::getResultCode() will return Memcached::RES_NOTFOUND
if the key does not exist.
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