Add/insert a new value at the specified index

# SplDoublyLinkedList::add

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

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

### Description

public 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.

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