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SplDoublyLinkedList::offsetSet

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

SplDoublyLinkedList::offsetSetSets 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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User Contributed Notes 1 note

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chanel at lipski-development dot de
3 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
*/

?>
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