* public function get(string $key, mixed $default = null): mixed;
*
*
* @param string $key The unique key of this item in the cache.
* @param mixed $default Default value to return if the key does not exist.
*
* @return array|mixed The value of the item from the cache, or $default in case of cache miss.
*
* @throws InvalidArgumentException
* MUST be thrown if the $key string is not a legal value.
*/
public function get_data(string $key, $default = null);
/**
* Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
*
* Equivalent to \Psr\SimpleCache\CacheInterface::set()
*
* public function set(string $key, mixed $value, null|int|\DateInterval $ttl = null): bool;
*
*
* @param string $key The key of the item to store.
* @param array $value The value of the item to store, must be serializable.
* @param null|int $ttl Optional. The TTL value of this item. If no value is sent and
* the driver supports TTL then the library may set a default value
* for it or let the driver take care of that.
*
* @return bool True on success and false on failure.
*
* @throws InvalidArgumentException
* MUST be thrown if the $key string is not a legal value.
*/
public function set_data(string $key, array $value, ?int $ttl = null): bool;
/**
* Delete an item from the cache by its unique key.
*
* Equivalent to \Psr\SimpleCache\CacheInterface::delete()
*
* public function delete(string $key): bool;
*
*
* @param string $key The unique cache key of the item to delete.
*
* @return bool True if the item was successfully removed. False if there was an error.
*
* @throws InvalidArgumentException
* MUST be thrown if the $key string is not a legal value.
*/
public function delete_data(string $key): bool;
}