(PECL ds >= 1.0.0)
Ds\Map::map — Returns the result of applying a callback to each value
Returns the result of applying a callback function to each value of the map.
callback
A callable to apply to each value in the map.
The callable should return what the key will be mapped to in the resulting map.
The result of applying a callback to each value in the map.
Note:
The keys and values of the current instance won't be affected.
Example #1 Ds\Map::map() example
<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
print_r($map->map(function($key, $value) { return $value * 2; }));
print_r($map);
?>The above example will output something similar to:
( [0] => Ds\Pair Object ( [key] => a [value] => 2 ) [1] => Ds\Pair Object ( [key] => b [value] => 4 ) [2] => Ds\Pair Object ( [key] => c [value] => 6 ) ) Ds\Map Object ( [0] => Ds\Pair Object ( [key] => a [value] => 1 ) [1] => Ds\Pair Object ( [key] => b [value] => 2 ) [2] => Ds\Pair Object ( [key] => c [value] => 3 ) )