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^SplDoublyLinkedListLast updated: Mon, 26 Oct 2026

SplDoublyLinkedList::add

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

SplDoublyLinkedList::add — Add/insert a new value at the specified index

Description

public function SplDoublyLinkedList::add(int $index, mixed $value): void

Insert the value value at the specified index, shuffling the previous value at that index (and all subsequent values) up through the list.

Parameters

index

The index where the new value is to be inserted.

value

The new value for the index.

Return Values

No value is returned.

Errors/Exceptions

Throws OutOfRangeException when index is out of bounds or when index cannot be parsed as an integer.


<SplDoublyLinkedListSplDoublyLinkedList::bottom>
^SplDoublyLinkedListLast updated: Mon, 26 Oct 2026