SplDoublyLinkedList::unshift()

(PHP 5 >= 5.3.0, PHP 7)

Prepends the doubly linked list with an element

说明

publicSplDoublyLinkedList::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。

$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