!hR V1Ru5 ```php hjkhghoppoopppooppoppoppoopoirh !hR V1Ru5 ```php hjkhghoppoopppooppoppoppoopoirh $keys A list of keys that can be obtained in a single operation. * @param mixed $default Default value to return for keys that do not exist. * * @return iterable A list of key => value pairs. Cache keys that do not exist or are stale will have $default as value. * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if $keys is neither an array nor a Traversable, * or if any of the $keys are not a legal value. */ public function getMultiple(iterable $keys, mixed $default = null): iterable; /** * Persists a set of key => value pairs in the cache, with an optional TTL. * * @param iterable $values A list of key => value pairs for a multiple-set operation. * @param null|int|\DateInterval $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 \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if $values is neither an array nor a Traversable, * or if any of the $values are not a legal value. */ public function setMultiple(iterable $values, null|int|\DateInterval $ttl = null): bool; /** * Deletes multiple cache items in a single operation. * * @param iterable $keys A list of string-based keys to be deleted. * * @return bool True if the items were successfully removed. False if there was an error. * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if $keys is neither an array nor a Traversable, * or if any of the $keys are not a legal value. */ public function deleteMultiple(iterable $keys): bool; /** * Determines whether an item is present in the cache. * * NOTE: It is recommended that has() is only to be used for cache warming type purposes * and not to be used within your live applications operations for get/set, as this method * is subject to a race condition where your has() will return true and immediately after, * another script can remove it making the state of your app out of date. * * @param string $key The cache item key. * * @return bool * * @throws \Psr\SimpleCache\InvalidArgumentException * MUST be thrown if the $key string is not a legal value. */ public function has(string $key): bool; }