(PHP 5 >= 5.3.0, PHP 7)
SplDoublyLinkedList::unshift — Prepends the doubly linked list with an element
public SplDoublyLinkedList::unshift ( mixed $value ) : void
Prepends value at the beginning of the doubly linked list.
value
The value to unshift.
No value is returned.
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https://www.php.net/manual/en/spldoublylinkedlist.unshift.php