PHP | Ds\Deque sort() Function

The Ds\Deque::sort() function is an inbuilt function in PHP which is used to sort the Deque in place by arranging the elements in increasing order.

Syntax:

public Ds\Deque::sort( $comparator ) : void

Parameters::This function accepts single parameter $comparator which holds the function to decides how to sort the elements. It helps in customizing the sort function.

Return Value: This function does not return any value.

Below programs illustrate the Ds\Deque::sort() function in PHP:

Program 1:

<?php

// Declare a deque
$deck = new \Ds\Deque([5, 6, 3, 2, 7, 1]);

echo("Elements of Deque\n");

// Display the Deque elements
print_r($deck);

// Use sort() function to sort
// the elements
$deck->sort();

echo("Sorted Deque\n");

// Display the Deque elements
print_r($deck);;

?>

Output:

Elements of Deque
Ds\Deque Object
(
    [0] => 5
    [1] => 6
    [2] => 3
    [3] => 2
    [4] => 7
    [5] => 1
)
Sorted Deque
Ds\Deque Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 5
    [4] => 6
    [5] => 7
)

Program 2:

<?php

// Declare a deque
$deck = new \Ds\Deque([5, 6, 3, 2, 7, 1]);

echo("Elements of Deque\n");

// Display the Deque elements
print_r($deck);

// comparator to sort in reverse order
$deck->sort(function($first, $second) {
    return $first <= $second;
});

echo("Sorted Deque\n");

// Display the Deque elements
print_r($deck);;

?>

Output:

Elements of Deque
Ds\Deque Object
(
    [0] => 5
    [1] => 6
    [2] => 3
    [3] => 2
    [4] => 7
    [5] => 1
)
Sorted Deque
Ds\Deque Object
(
    [0] => 7
    [1] => 6
    [2] => 5
    [3] => 3
    [4] => 2
    [5] => 1
)

Reference: http://php.net/manual/en/ds-deque.sort.php