Add Arr::each method

Author: cdtweb

src/Arr.php

@@ -43,4 +43,25 @@ public static function dot(array $array): array
     {
         return self::flatten($array);
     }
+
+    /**
+     * Recursively assign the callable's return value to each array item.
+     *
+     * Array keys are preserved.
+     *
+     * @param array $array
+     * @param callable $callable
+     * @return array
+     */
+    public static function each(array $array, callable $callable): array
+    {
+        foreach ($array as $key => $value) {
+            if (is_array($value) && !empty($value)) {
+                $array[$key] = self::each($value, $callable);
+            } else {
+                $array[$key] = call_user_func($callable, $value);
+            }
+        }
+        return $array;
+    }
 }

tests/ArrTest.php

@@ -3,6 +3,9 @@
 
 class ArrTest extends \PHPUnit_Framework_TestCase
 {
+    /**
+     * @covers Arr::flatten, Arr::dot
+     */
     public function testFlatten()
     {
         $array = ['a' => 'b', 'c' => ['d' => 'e', 'f' => ['g' => [1, 2, 3 => []]]]];
@@ -23,4 +26,18 @@ public function testFlatten()
         $this->assertEquals(2, $flatArray['c.f.g.1']);
         $this->assertEquals([], $flatArray['c.f.g.3']);
     }
+
+    /**
+     * @covers Arr::each
+     */
+    public function testEach()
+    {
+        $array = [1, 2, 3, 4, 5, [6, 7, 8, 9, 10]];
+
+        $array2 = Arr::each($array, function ($value) {
+            return $value * 2;
+        });
+
+        $this->assertEquals([2, 4, 6, 8, 10, [12, 14, 16, 18, 20]], $array2);
+    }
 }