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