Prepends the doubly linked list with an element

SplDoublyLinkedList::unshift

(PHP 5 >= 5.3.0)

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

void SplDoublyLinkedList::unshift ( mixed $value )

Prepends value at the beginning of the doubly linked list.

No value is returned.