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
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