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 $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.

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chanel at lipski-development dot de ¶

6 years ago

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
*/

?>