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PHP | Ds\Deque reverse() Function

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The Ds\Deque::reverse() function is an inbuilt function in PHP which is used to reverse the elements in the Deque in-place. Syntax:
public Ds\Deque::reverse( void ) : void
Parameters: This function does not accept any parameter. Return Value: This function does not return any value. Below programs illustrate the Ds\Deque::reverse() function in PHP: Program 1:
<?php
  
// Declare a deque
$deck = new \Ds\Deque([10, 20, 30, 40, 50, 60]);
  
echo("Elements of Deque\n");
  
// Display the Deque elements
var_dump($deck);
  
// Reversing the deque
$deck->reverse();
   
echo("\nElements of the reversed deque\n");
  
// Display the Deque elements
var_dump($deck);
  
?>

                    
Output:
Elements of Deque
object(Ds\Deque)#1 (6) {
  [0]=>
  int(10)
  [1]=>
  int(20)
  [2]=>
  int(30)
  [3]=>
  int(40)
  [4]=>
  int(50)
  [5]=>
  int(60)
}

Elements of the reversed deque
object(Ds\Deque)#1 (6) {
  [0]=>
  int(60)
  [1]=>
  int(50)
  [2]=>
  int(40)
  [3]=>
  int(30)
  [4]=>
  int(20)
  [5]=>
  int(10)
}
Program 2:
<?php
  
// Declare a deque
$deck = new \Ds\Deque(["geeks", "GFG", "ABC"]);
  
echo("Elements of Deque\n");
  
// Display the Deque elements
print_r($deck);
  
// Reversing the deque
$deck->reverse();
   
echo("\nElements of the reversed deque\n");
  
// Display the Deque elements
print_r($deck);
  
?>

                    
Output:
Elements of Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => GFG
    [2] => ABC
)

Elements of the reversed deque
Ds\Deque Object
(
    [0] => ABC
    [1] => GFG
    [2] => geeks
)
Reference: http://php.net/manual/en/ds-deque.reverse.php

Last Updated : 14 Aug, 2019
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