(PECL memcached >= 0.1.0)
Memcached::replace — Replace the item under an existing key
public Memcached::replace ( string $key , mixed $value [, int $expiration ] ) : bool
Memcached::replace() is similar to Memcached::set(), but the operation fails if the key does not exist on the server.
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_NOTSTORED if the key does not exist.
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https://www.php.net/manual/en/memcached.replace.php