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PHP | SplDoublyLinkedList offsetSet() Function
  • Last Updated : 23 Aug, 2019

The SplDoublyLinkedList::offsetSet() function is an inbuilt function in PHP which is used to set the value at given index.

Syntax:

void SplDoublyLinkedList::offsetSet( $index, $newval )

Parameters: This function accepts two parameters as mentioned above and described below:

  • $index: It holds the index where value to be set.
  • $newval: It holds the value which to be set at given index.

Return Value: It does not return any value.

Below programs illustrate the SplDoublyLinkedList::offsetSet() 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::offsetSet() function
// to set the value at given index
$list->offsetSet(1, "GeeksforGeeks");
  
$list->offsetSet(2, "Welcome");
  
var_dump($list);
  
?> 
Output:
object(SplDoublyLinkedList)#1 (2) {
  ["flags":"SplDoublyLinkedList":private]=>
  int(0)
  ["dllist":"SplDoublyLinkedList":private]=>
  array(5) {
    [0]=>
    int(30)
    [1]=>
    string(13) "GeeksforGeeks"
    [2]=>
    string(7) "Welcome"
    [3]=>
    string(5) "Geeks"
    [4]=>
    string(1) "G"
  }
}

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::offsetSet() function
// to set the value at given index
$list->offsetSet(1, "Welcome");
  
$list->offsetSet(2, "to");
  
$list->offsetSet(3, "GeeksforGeeks");
  
print_r($list);
  
?> 
Output:
SplDoublyLinkedList Object
(
    [flags:SplDoublyLinkedList:private] => 0
    [dllist:SplDoublyLinkedList:private] => Array
        (
            [0] => 1
            [1] => Welcome
            [2] => to
            [3] => GeeksforGeeks
            [4] => 5
        )

)

Reference: https://www.php.net/manual/en/spldoublylinkedlist.offsetset.php

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