(PECL memcached >= 0.1.0)
Memcached::casByKey — Compare and swap an item on a specific server
public Memcached::casByKey ( float $cas_token , string $server_key , string $key , mixed $value [, int $expiration ] ) : bool
Memcached::casByKey() is functionally equivalent to Memcached::cas(), except that the free-form server_key
can be used to map the key
to a specific server. This is useful if you need to keep a bunch of related keys on a certain server.
cas_token
Unique value associated with the existing item. Generated by memcache.
server_key
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.
key
The key under which to store the value.
value
The value to store.
expiration
The expiration time, defaults to 0. See Expiration Times for more info.
Returns true
on success or false
on failure. The Memcached::getResultCode() will return Memcached::RES_DATA_EXISTS
if the item you are trying to store has been modified since you last fetched it.
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https://www.php.net/manual/en/memcached.casbykey.php