Replace the item under an existing key on a specific server

# Memcached::replaceByKey

(PECL memcached >= 0.1.0)

Memcached::replaceByKey — Replace the item under an existing key on a specific server

### Description

public Memcached::replaceByKey(
string `$server_key`,
string `$key`,
mixed `$value`,
int `$expiration` = 0
): bool

Memcached::replaceByKey() is functionally equivalent to Memcached::replace(), 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

`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_NOTSTORED` if the key does not exist.

### See Also

- Memcached::replace() - Replace the item under an existing key
- Memcached::set() - Store an item
- Memcached::add() - Add an item under a new key

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