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SplDoublyLinkedList::offsetUnset

(PHP 5 >= 5.3.0, PHP 7)

SplDoublyLinkedList::offsetUnsetUnsets the value at the specified $index

Descrição

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

Unsets the value at the specified index.

Parâmetros

index

The index being unset.

Valor Retornado

Não há valor retornado.

Erros

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
9 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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