map-filter-mutators.diff

// array_map
- $lowercasedStrings = array_map(['P', 'H', 'P'], function ($v) {
-    return strtolower($v);
- });
+ $lowercasedStrings = ['P', 'H', 'P'];

// array_filter
- $evenNumbers = array_filter([1, 2, 3, 4], function ($v) { 
-    return $v % 2;
- });
+ $evenNumbers = [1, 2, 3, 4];