The Ds/Map::reverse() function in PHP is used to in-place reverse the elements of a specified Map instance. That is, the function in-place reverses the order of elements present in the specified Map instance.
Syntax:
Ds\Map public Ds\Map::reverse ( int $position )
Parameter: This function does not accepts any parameter.
Return value: The function does not returns any value.
Below programs illustrate the Ds/Map::reverse() function:
Program 1:
PHP
<?php// PHP program to illustrate reverse() function$map = new \Ds\Map([1 => 10, 2 => 20, 3 => 30]);// Reverse the Map$map->reverse();// Print the reversed Mapprint_r($map);?> |
Output:
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => 3
[value] => 30
)
[1] => Ds\Pair Object
(
[key] => 2
[value] => 20
)
[2] => Ds\Pair Object
(
[key] => 1
[value] => 10
)
)
Program 2:
PHP
<?php// PHP program to illustrate reverse() function$map = new \Ds\Map(["first" => "Geeks", "second" => "for", "third" => "Geeks"]);// Reverse the Map$map->reverse();// Print the Mapprint_r($map);?> |
Output:
Ds\Map Object
(
[0] => Ds\Pair Object
(
[key] => third
[value] => Geeks
)
[1] => Ds\Pair Object
(
[key] => second
[value] => for
)
[2] => Ds\Pair Object
(
[key] => first
[value] => Geeks
)
)
Reference: http://php.net/manual/en/ds-map.reverse.php
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