SplDoublyLinkedList::unshift

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

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

说明

public 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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User Contributed Notes 1 note

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lincoln dot du dot j at gmail dot com ¶

4 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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