International PHP Conference Berlin 2025

SplDoublyLinkedList::unshift

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

SplDoublyLinkedList::unshiftPrepends 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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lincoln dot du dot j at gmail dot com
7 years ago
$dll = new SplDoublyLinkedList();
$dll->push(2);
$dll->push(3);
$dll->unshift(5); // add 5 beginning of the array
$dll->rewind();

while($dll->valid()){
echo $dll->current()."\n";
$dll->next();
}

Output

5
2
3
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