The SplDoublyLinkedList class

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

    Introduction

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

    Class synopsis

    classSplDoublyLinkedListimplementsIterator, Countable, ArrayAccess, Serializable {
    publicconstintIT_MODE_LIFO;
    publicconstintIT_MODE_FIFO;
    publicconstintIT_MODE_DELETE;
    publicconstintIT_MODE_KEEP;
    publicadd(int$index, mixed$value): void
    publicbottom(): mixed
    publiccount(): int
    publiccurrent(): mixed
    publicgetIteratorMode(): int
    publicisEmpty(): bool
    publickey(): int
    publicnext(): void
    publicoffsetExists(int$index): bool
    publicoffsetGet(int$index): mixed
    publicoffsetSet(?int$index, mixed$value): void
    publicoffsetUnset(int$index): void
    publicpop(): mixed
    publicprev(): void
    publicpush(mixed$value): void
    publicrewind(): void
    publicserialize(): string
    publicsetIteratorMode(int$mode): int
    publicshift(): mixed
    publictop(): mixed
    publicunserialize(string$data): void
    publicunshift(mixed$value): void
    publicvalid(): bool
    }

    Predefined Constants

    Iteration Direction

    SplDoublyLinkedList::IT_MODE_LIFO

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

    SplDoublyLinkedList::IT_MODE_FIFO

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

    Iteration Behavior

    SplDoublyLinkedList::IT_MODE_DELETE

    Iteration will remove the iterated elements.

    SplDoublyLinkedList::IT_MODE_KEEP

    Iteration will not remove the iterated elements.

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