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 $deck = new \Ds\Deque(["neveropen", "GFG", "ABC"]);   echo("Elements of Deque\n");   // Display the Deque elements print_r($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] => neveropen
[1] => GFG
[2] => ABC
)
Elements of the reversed deque
Ds\Deque Object
(
[0] => ABC
[1] => GFG
[2] => neveropen
)
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