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    SplDoublyLinkedList 类

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

    简介

    SplDoublyLinkedList 类提供双向链表的主要功能。

    类摘要

    class SplDoublyLinkedList implements Iterator, Countable, ArrayAccess, Serializable {
    /* 常量 */
    public const int IT_MODE_LIFO;
    public const int IT_MODE_FIFO;
    public const int IT_MODE_DELETE;
    public const int IT_MODE_KEEP;
    /* 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
    }

    预定义常量

    迭代方向

    SplDoublyLinkedList::IT_MODE_LIFO

    列表将以先进后出的顺序迭代，就像栈一样。

    SplDoublyLinkedList::IT_MODE_FIFO

    列表将以先进先出的顺序迭代，就像队列一样。

    迭代行为

    SplDoublyLinkedList::IT_MODE_DELETE

    迭代将移除已迭代的元素。

    SplDoublyLinkedList::IT_MODE_KEEP

    迭代将不会移除已迭代的元素。

    目录

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