SplDoublyLinkedList::offsetUnset()函数是PHP中的内置函数, 用于取消给定索引处的值。
语法如下:
void SplDoublyLinkedList::offsetUnset( $index )
参数:该函数接受单个参数$ index包含要取消设置其值的索引值。
【PHP SplDoublyLinkedList offsetUnset()函数用法示例】返回值:它不返回任何值。
下面的程序说明了SplDoublyLinkedList::offsetUnset()PHP中的功能:
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 );
?>
输出如下:
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 );
?>
输出如下:
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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