array map traversable

src/helpers/ArrayHelper.php

@@ -7,7 +7,7 @@ use yiins\exceptions\InvalidValueException;
 
 class ArrayHelper
 {
-    public function mapTraversable(callable $callback, \Traversable $array)
+    public static function mapTraversable(callable $callback, \Traversable $array)
     {
         $result = [];
         foreach ($array as $value) {