The SplDoublyLinkedList class

(PHP 5 >= 5.3.0, PHP 7, PHP 8)


The SplDoublyLinkedList class provides the main functionalities of a doubly linked list.


class SplDoublyLinkedList implements Iterator, Countable, ArrayAccess, Serializable {
/* 常量 */
const int IT_MODE_LIFO = 2;
const int IT_MODE_FIFO = 0;
const int IT_MODE_DELETE = 1;
const int IT_MODE_KEEP = 0;
/* 方法 */
public add(int $index, mixed $value): void
public bottom(): mixed
public count(): int
public current(): mixed
public getIteratorMode(): int
public isEmpty(): bool
public key(): int
public next(): void
public offsetExists(int $index): bool
public offsetGet(int $index): mixed
public offsetSet(?int $index, mixed $value): void
public offsetUnset(int $index): void
public pop(): mixed
public prev(): void
public push(mixed $value): void
public rewind(): void
public serialize(): string
public setIteratorMode(int $mode): int
public shift(): mixed
public top(): mixed
public unserialize(string $data): void
public unshift(mixed $value): void
public valid(): bool


Iteration Direction


The list will be iterated in a last in, first out order, like a stack.


The list will be iterated in a first in, first out order, like a queue.

Iteration Behavior


Iteration will remove the iterated elements.


Iteration will not remove the iterated elements.