PHP | SplDoublyLinkedList rewind() Function

The SplDoublyLinkedList::rewind() function is an inbuilt function in PHP which is used to rewind the iterator back to the start or beginning.

Syntax:

void SplDoublyLinkedList::rewind( void )

Parameters: This function does not accepts any parameters.



Return Value: It does not return any value.

Below programs illustrate the SplDoublyLinkedList::rewind() function in PHP:

Program 1:

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<?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');
  
// Use rewind() function
$list->rewind();
  
// Use SplDoublyLinkedList::current() function
// to get the current element
var_dump($list->current());
  
?> 

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Output:

int(30)

Program 2:

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<?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 rewind() function
$list->rewind();
  
// Display the elements of
// doubly linked list
var_dump($list);
  
?> 

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Output:

object(SplDoublyLinkedList)#1 (2) {
  ["flags":"SplDoublyLinkedList":private]=>
  int(0)
  ["dllist":"SplDoublyLinkedList":private]=>
  array(5) {
    [0]=>
    int(1)
    [1]=>
    int(2)
    [2]=>
    int(3)
    [3]=>
    int(8)
    [4]=>
    int(5)
  }
}

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



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