*/ interface ItemInterface extends CacheItemInterface { /** * References the Unix timestamp stating when the item will expire. */ const METADATA_EXPIRY = 'expiry'; /** * References the time the item took to be created, in milliseconds. */ const METADATA_CTIME = 'ctime'; /** * References the list of tags that were assigned to the item, as string[]. */ const METADATA_TAGS = 'tags'; /** * Adds a tag to a cache item. * * Tags are strings that follow the same validation rules as keys. * * @param string|string[] $tags A tag or array of tags * * @return $this * * @throws InvalidArgumentException When $tag is not valid * @throws CacheException When the item comes from a pool that is not tag-aware */ public function tag($tags): self; /** * Returns a list of metadata info that were saved alongside with the cached value. * * See ItemInterface::METADATA_* consts for keys potentially found in the returned array. */ public function getMetadata(): array; }