Ds\Set::sort

(PECL ds >= 1.0.0)

Ds\Set::sort — Sorts the set in-place

public Ds\Set::sort(callable $comparator = ?): void

Sorts the set in-place, using an optional comparator function.

comparator: The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

callback(mixed $a, mixed $b): int

Caution
Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

No value is returned.

Example #1 Ds\Set::sort() example


<?php
$set = new \Ds\Set([4, 5, 1, 3, 2]);
$set->sort();

print_r($set);
?>

The above example will output something similar to:

Ds\Set Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

Example #2 Ds\Set::sort() example using a comparator


<?php
$set = new \Ds\Set([4, 5, 1, 3, 2]);

$set->sort(function($a, $b) {
    return $b <=> $a;
});

print_r($set);
?>

The above example will output something similar to:

Ds\Set Object
(
    [0] => 5
    [1] => 4
    [2] => 3
    [3] => 2
    [4] => 1
)