CascadiaPHP 2024

SplDoublyLinkedList::offsetUnset

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

SplDoublyLinkedList::offsetUnsetUnsets the value at the specified $index

Açıklama

public SplDoublyLinkedList::offsetUnset(int $index): void

Unsets the value at the specified index.

Bağımsız Değişkenler

index

The index being unset.

Dönen Değerler

Hiçbir değer dönmez.

Hatalar/İstisnalar

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

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marco dot paulo dot lopes at gmail dot com
13 years ago
When unsetting an offset, the element will be removed from the double linked list. So the following code:

<?php

$obj
= new SplDoublyLinkedList();

$obj->push(4);
$obj->push(5);
$obj->push(6);

$obj->offsetUnset(1);
echo
"Our Linked List:";
print_r($obj);

?>

Will output:

Our Linked List:SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 4
[1] => 5
[2] => 6
)

)
Our New Linked List:SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 4
[1] => 6
)

Notice that the element with the index 2 has now the index 1. The original element with index 1 did not only had it's value unset but was also removed from the list.
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