SplDoublyLinkedList::offsetUnset
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplDoublyLinkedList::offsetUnset — Unsets the value at the specified $index
说明
public SplDoublyLinkedList::offsetUnset(int
$index): voidUnsets 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.
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User Contributed Notes 1 note
marco dot paulo dot lopes at gmail dot com ¶
11 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.
备份地址：http://www.lvesu.com/blog/php/spldoublylinkedlist.offsetunset.php