Memcached
PHP Manual

Memcached::casByKey

Compare and swap an item on a specific server

Description

public bool Memcached::casByKey(
    stringintfloat $cas_token,
    string $server_key,
    string $key,
    mixed $value,
    int $expiration = 0
)

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.

Parameters

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.

Return Values

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.

See Also

  • Memcached::cas