SplDoublyLinkedList::offsetUnset()函数是PHP中的内置函数,用于取消设置给定索引处的值。
用法:
void SplDoublyLinkedList::offsetUnset( $index )
参数:该函数接受单个参数$index,该参数保存要取消设置其值的索引值。
返回值:它不返回任何值。
以下示例程序旨在说明PHP中的SplDoublyLinkedList::offsetUnset()函数:
程序1:
<?php
// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList;
// Use SplDoublyLinkedList::add() function to
// add elements to the SplDoublyLinkedList
$list->add(0, 30);
$list->add(1, 20);
$list->add(2, 30);
$list->add(3, "Geeks");
$list->add(4, 'G');
$list->rewind();
// Use SplDoublyLinkedList::offsetUnset() function
// to unset the value at given index
$list->offsetUnset(0);
$list->offsetUnset(1);
$list->offsetUnset(0);
$list->offsetUnset(1);
var_dump($list);
?>
输出:
object(SplDoublyLinkedList)#1 (2) { ["flags":"SplDoublyLinkedList":private]=> int(0) ["dllist":"SplDoublyLinkedList":private]=> array(1) { [0]=> string(5) "Geeks" } }
程序2:
<?php
// Declare an empty SplDoublyLinkedList
$list = new \SplDoublyLinkedList();
// Use SplDoublyLinkedList::push() function to
// add elements to the SplDoublyLinkedList
$list->push(1);
$list->push(2);
$list->push(3);
$list->push(8);
$list->push(5);
// Use SplDoublyLinkedList::offsetUnset() function
// to unset the value at given index
$list->offsetUnset(1);
$list->offsetUnset(2);
print_r($list);
?>
输出:
SplDoublyLinkedList Object ( [flags:SplDoublyLinkedList:private] => 0 [dllist:SplDoublyLinkedList:private] => Array ( [0] => 1 [1] => 3 [2] => 5 ) )
参考: https://www.php.net/manual/en/spldoublylinkedlist.offsetunset.php
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