SplDoublyLinkedList::offsetSet

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

SplDoublyLinkedList::offsetSet — Sets the value at the specified $index to $value

说明

public SplDoublyLinkedList::offsetSet ( int|null $index , mixed $value ) : void

Sets the value at the specified index to value.

参数

index: The index being set. If null, the next value will be added after the last item.
value: The new value for the index.

返回值

没有返回值。

错误／异常

Throws OutOfRangeException when index is out of bounds or when index cannot be parsed as an integer.

User Contributed Notes

chanel at lipski-development dot de 25-Feb-2018 03:21


How to change elements of a SplDoublyLinkedList

<?php 



function change_elements($list,$old_index,$new_index){

    

$tmp1=$list->offsetGet($old_index);

$tmp2=$list->offsetGet($new_index);

$list->offsetSet($old_index,$tmp2);

$list->offsetSet($new_index,$tmp1);



}



$list=new SplDoublyLinkedList(); 

$list->push("A");

$list->push("B");

$list->push("C");



/*

OUTPUT

A

B

C

*/



change_elements($list,0,1);



/*

OUTPUT

B

A

C

*/



?>