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PHP SplDoublyLinkedList unshift () function

Syntax:
void SplDoublyLinkedList::unshift ($value)
Parameters: this function takes one parameter $valuewhich is used to cancel the offset of the value in a doubly linked list.Return value:does not return any value. The programs below illustrate the function SplDoublyLinkedList::unshift()in PHP:Program 1:

 
// Declare an empty SplDoublyLinkedList $list = new SplDoublyLinkedList;  
// Use the SplDoublyLinkedList::add() function for
// add elements to SplDoublyLinkedList $list -> add (0, 30); $list -> add (1, 20); $list -> add (2, 30); $list -> add (3, " Geeks " ); $list -> add (4, ’ G’ );  
// Using the unshift() function $list -> unshift ( "GeeksforGeeks" );  
// Show list items print_r ( $list );  
?>
Exit:
SplDoublyLinkedList Object ( [flags: SplDoublyLinkedList: private] = > 0 [dllist: SplDoublyLinkedList: private] = > Array ([0] = > GeeksforGeeks [1] = > 30 [2] = > 20 [3] = > 30 [4] = > Geeks [5] = > G))
Program 2:  
// Declare empty SplDoublyLinkedList $list = new SplDoublyLinkedList();  
// Use the SplDoublyLinkedList::push() function for
// add elements to SplDoublyLinkedList $list -> push (1); $list -> push (2); $list -> push (3); $list -> push (8); $list -> push (5);  
// Using the unshift() function $list -> unshift ( "Geeks" );  
// Show list items print_r ( $list );  
?>
Exit:
SplDoublyLinkedList Object ( [flags: SplDoublyLinkedList: private] = > 0 [dllist: SplDoublyLinkedList: private] = > Array ([0] = > Geeks [1] = > 1 [2] = > 2 [3] = > 3 [4] = > 8 [5] = > 5))
Link:https://www.php.net/manual/en/spldoublylinkedlist.unshift.php

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