Fixes #11950: Improve BaseArrayHelper::keyExists speed

framework/CHANGELOG.md

@@ -4,10 +4,10 @@ Yii Framework 2 Change Log
 2.0.10 under development
 ------------------------
 
-- Bug #11949: Fixed `ActiveField::end` generates close tag when it's `option['tag']` is null (egorio)
 - Bug #11912: Fixed PostgreSQL Schema to support negative default values for integer/float/decimal columns (nsknewbie)
 - Bug #11947: Fixed `gridData` initialization in `yii.gridView.js` (pavlm)
-
+- Bug #11949: Fixed `ActiveField::end` generates close tag when it's `option['tag']` is null (egorio)
+- Enh #11950: Improve BaseArrayHelper::keyExists speed (egorio)
 
 2.0.9 July 11, 2016
 -------------------

framework/helpers/BaseArrayHelper.php

@@ -486,7 +486,9 @@ class BaseArrayHelper
     public static function keyExists($key, $array, $caseSensitive = true)
     {
         if ($caseSensitive) {
-            return array_key_exists($key, $array);
+            // Function `isset` checks key faster but skips `null`, `array_key_exists` handles this case
+            // http://php.net/manual/en/function.array-key-exists.php#107786
+            return isset($array[$key]) || array_key_exists($key, $array);
         } else {
             foreach (array_keys($array) as $k) {
                 if (strcasecmp($key, $k) === 0) {