Interface Serializable

Serializable
- SplObjectStorage implements Countable, Iterator, Serializable, ArrayAccess
- SplDoublyLinkedList implements Iterator, Countable, ArrayAccess, Serializable
  - SplQueue

Methods
`public`	`serialize(): string\|null` Implemented by `SplObjectStorage::serialize()` `SplDoublyLinkedList::serialize()`	#
`public`	`unserialize(string $data): void` Implemented by `SplObjectStorage::unserialize()` `SplDoublyLinkedList::unserialize()`	#