Fixes #15301: Fixed `ArrayHelper::filter()` to work properly with `0` in values

framework/CHANGELOG.md

@@ -21,6 +21,7 @@ Yii Framework 2 Change Log
 - Enh #15221: Added support for the `--<option> <value>` console option syntax (brandonkelly)
 - Enh #15221: Improved the `help/list-action-options` console command output for command options without a description (brandonkelly)
 - Bug #15270: Resolved potential race conditions when writing generated php-files (kalessil)
+- Bug #15301: Fixed `ArrayHelper::filter()` to work properly with `0` in values (hhniao)
 
 2.0.13.1 November 14, 2017
 --------------------------

framework/helpers/BaseArrayHelper.php

@@ -938,7 +938,7 @@ class BaseArrayHelper
                 continue;
             }
 
-            if (empty($array[$globalKey])) {
+            if (!key_exists($globalKey, $array)) {
                 continue;
             }
             if ($localKey === null) {

tests/framework/helpers/ArrayHelperTest.php

@@ -1269,5 +1269,15 @@ class ArrayHelperTest extends TestCase
         $this->assertEquals(ArrayHelper::filter($array, ['X']), []);
         $this->assertEquals(ArrayHelper::filter($array, ['X.Y']), []);
         $this->assertEquals(ArrayHelper::filter($array, ['A.X']), []);
+        
+        $tmp = [
+            'a' => 0,
+            'b' => '',
+            'c' => false,
+            'd' => null,
+            'e' => true,
+        ];
+        
+        $this->assertEquals(ArrayHelper::filter($tmp, array_keys($tmp)), $tmp);
     }
 }