Ds\Map::ksorted() function can return a copy, sorted by key.
public Ds\Map Ds\Map::ksorted([ callable $comparator ] )
Ds\Map::ksorted() function can return a copy, sorted by key using an optional comparator function.
Ds\Map::ksorted() function can return a copy of the map, sorted by key.
<?php $map = new \Ds\Map([1 => 20, 2 => 10, 3 => 30]); print_r($map->sorted()); ?>