Class SplDoublyLinkedList

`implements`	`Iterator, Countable, ArrayAccess, Serializable`

SplDoublyLinkedList implements Iterator, Countable, ArrayAccess, Serializable
- SplQueue

Methods
`public`	`add(int $index, mixed $value): void`	#
`public`	`pop(): mixed`	#
`public`	`shift(): mixed`	#
`public`	`push(mixed $value): void`	#
`public`	`unshift(mixed $value): void`	#
`public`	`top(): mixed`	#
`public`	`bottom(): mixed`	#
`public`	`__debugInfo(): array`	#
`public`	`count(): int` Implements `Countable::count()`	#
`public`	`isEmpty(): bool`	#
`public`	`setIteratorMode(int $mode): int`	#
`public`	`getIteratorMode(): int`	#
`public`	`offsetExists(int $index): bool` Implements `ArrayAccess::offsetExists()`	#
`public`	`offsetGet(int $index): mixed` Actually this should be return by ref but atm cannot be. Actually this should be return by ref but atm cannot be. Implements `ArrayAccess::offsetGet()`	#
`public`	`offsetSet(int\|null $index, mixed $value): void` Implements `ArrayAccess::offsetSet()`	#
`public`	`offsetUnset(int $index): void` Implements `ArrayAccess::offsetUnset()`	#
`public`	`rewind(): void` Implements `Iterator::rewind()`	#
`public`	`current(): mixed` Implements `Iterator::current()`	#
`public`	`key(): int` Implements `Iterator::key()`	#
`public`	`prev(): void`	#
`public`	`next(): void` Implements `Iterator::next()`	#
`public`	`valid(): bool` Implements `Iterator::valid()`	#
`public`	`unserialize(string $data): void` Implements `Serializable::unserialize()`	#
`public`	`serialize(): string` Implements `Serializable::serialize()`	#
`public`	`__serialize(): array`	#
`public`	`__unserialize(array $data): void`	#