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PHP SplDoublyLinkedList shift () function

Syntax:
mixed SplDoublyLinkedList::shift (void)
Parameters:this function takes no parameters.Return value:returns the value of the offset node.The programs below illustrate the function SplDoublyLinkedList::shift() 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’ );  
// Use the shift() function var_dump ( $list -> shift()); var_dump ( $list -> shift()); var_dump ( $list -> shift());  
?>
Exit:
int (30 ) int (20) int (30)
Program 2:  
// Declare an 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);  
// Use the shift() function var_dump ( $list -> shift()); var_dump ( $list -> shift()); var_dump ( $list -> shift()); var_dump ( $list -> shift());  
?>
Exit:
int (1 ) int (2) int (3) int (8)
Link: https://www.php.net/manual/en/spldoublylinkedlist.shift.php

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