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

### 说明

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

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

### 参数

`value`

  The value to unshift.

### 返回值

没有返回值。

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