PHP - Ds Map apply() Function

Ds\Map::apply() function can update all values by applying a callback function to each value.

Syntax

public void Ds\Map::apply( callable $callback )

Ds\Map::apply() function can update all values by applying a callback function to each value in a map.

Ds\Map::apply() function doesn't return any value.

Example 1

<?php 
   $map = new \Ds\Map(["1" => 10, "2" => 20, "3" => 30]); 
  
   $func = function($key, $value) { 
      return $value*5; 
   }; 
   $map->apply($func); 
   print_r($map); 
?>

Example 2

<?php 
   $map = new \Ds\Map(["1" => "Tutorials", "2" => "Point", "3" => "India"]); 
  
   $map->apply(function($key, $value) {  
      return strtoupper($value); 
   }); 
   print_r($map);
?>