Prepends the doubly linked list with an element

# SplDoublyLinkedList::unshift

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

SplDoublyLinkedList::unshift — Prepends the doubly linked list with an element

### Description

public SplDoublyLinkedList::unshift(mixed `$value`): void

Prepends `value` at the beginning of the doubly linked list.

### Parameters

`value`

  The value to unshift.

### Return Values

No value is returned.

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