PHP - Ds Deque unshift() Function

Ds\Deque::unshift() function can add values to front of the deque.

Syntax

public void Ds\Deque::unshift([ mixed $values ] )

Ds\Deque::unshift() function can add values to the front of the deque, moving all current values forward to make room for new values.

Ds\Deque::unshift() function doesn't return any value.

Example

<?php  
   $deque = new \Ds\Deque([10, 20, 30]);  
   $deque -> unshift(3); 
   $deque -> unshift(7); 
   $deque -> unshift(2); 
   print_r($deque); 
?>