SplDoublyLinkedList
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SplDoublyLinkedList::offsetUnset

(PHP 5 >= 5.3.0)

SplDoublyLinkedList::offsetUnset — Unsets the value at the specified $index

说明

void SplDoublyLinkedList::offsetUnset ( mixed $index )

Unsets the value at the specified index.

参数

index

The index being unset.

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.

SplDoublyLinkedList
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PHP手册
PHP手册 - N: Unsets the value at the specified $index

用户评论:

marco dot paulo dot lopes at gmail dot com (31-May-2011 01:40)

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.