What is the Ds\Vector::reverse() function in PHP?

Ds\Vector::reverse() is a built-in function in PHP.

The function reverses a specified vector array in-place.The reversed items occupy the same storage as the original ones.

Syntax

The following is the function prototype:

public void Ds\Vector::reverse (void)

Parameters and return value

The Ds\Vector::reverse() function does not take any input parameters, as the vector is reversed in place.

Since the function has a return of type void, nothing is returned.

Code

The following code demonstrates how we can use the reverse function.

<?php 

// Create new Vector 
$vector = new \Ds\Vector([2, 3, 5, 7, 11]); 
  
// Print original vector 
print_r($vector); 
  
echo("Vector after reversing\n"); 
  
// Use reverse() function to reverse the vector
$vector->reverse();
  
print_r($vector);

?>

Output

Ds\Vector Object
(
[0] => 2
[1] => 3
[2] => 5
[3] => 7
[4] => 11
)
Vector after reversing
Ds\Vector Object
(
[0] => 11
[1] => 7
[2] => 5
[3] => 3
[4] => 2
)

Note: To run this program, you must first install Data Structures for PHP on your local machine.