PHP - Ds Deque shift() Function

Ds\Deque::shift() function can remove and return the first value.

Syntax

public mixed Ds\Deque::shift( void )

Ds\Deque::shift() function doesn't have any parameters.

Ds\Deque::shift() function can return the first value that was removed and throw UnderflowException if empty.

Example 1

<?php  
   $deque = new \Ds\Deque([10, 20, 30, 40, 50]);  
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
?> 

Example 2

<?php  
   $deque = new \Ds\Deque(["Tutorials", "Point"]);  
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
   
   $deque = new \Ds\Deque(["T", "U", "T", "O", "R", "I", "X", 1, 2, 3]);  
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
   var_dump($deque -> shift()); 
?>