Request multiple items from a specific server

# Memcached::getDelayedByKey

(PECL memcached >= 0.1.0)

Memcached::getDelayedByKey — Request multiple items from a specific server

### Description

public Memcached::getDelayedByKey(
string `$server_key`,
array `$keys`,
bool `$with_cas` = `false`,
?callable `$value_cb` = `null`
): bool

Memcached::getDelayedByKey() is functionally equivalent to Memcached::getDelayed(), except that the free-form `server_key` can be used to map the `keys` to a specific 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.

`keys`

  Array of keys to request.

`with_cas`

  Whether to request CAS token values also.

`value_cb`

  The result callback or `null`.

### Return Values

Returns `true` on success or `false` on failure. Use Memcached::getResultCode() if necessary.

### See Also

- Memcached::getDelayed() - Request multiple items
- Memcached::fetch() - Fetch the next result
- Memcached::fetchAll() - Fetch all the remaining results

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