The SplDoublyLinkedList::offsetUnset() function is an inbuilt function in PHP which is used to unset the value at given index.
Syntax:
void SplDoublyLinkedList::offsetUnset( $index )
Parameters: This function accepts a single parameter $index which holds the index value whose value to be unset.
Return Value: It does not return any value.
Below programs illustrate the SplDoublyLinkedList::offsetUnset() function in PHP:
Program 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);   ?> |
Output:
object(SplDoublyLinkedList)#1 (2) {
["flags":"SplDoublyLinkedList":private]=>
int(0)
["dllist":"SplDoublyLinkedList":private]=>
array(1) {
[0]=>
string(5) "Geeks"
}
}
Program 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);   ?> |
Output:
SplDoublyLinkedList Object
(
[flags:SplDoublyLinkedList:private] => 0
[dllist:SplDoublyLinkedList:private] => Array
(
[0] => 1
[1] => 3
[2] => 5
)
)
Reference: https://www.php.net/manual/en/spldoublylinkedlist.offsetunset.php
