diff --git a/core/lib/Drupal/Component/Utility/MapArray.php b/core/lib/Drupal/Component/Utility/MapArray.php index 7b454aa..f671223 100644 --- a/core/lib/Drupal/Component/Utility/MapArray.php +++ b/core/lib/Drupal/Component/Utility/MapArray.php @@ -33,7 +33,7 @@ public static function copyValuesToKeys(array $array, $callback = NULL) { // array_combine() fails with empty arrays: // http://bugs.php.net/bug.php?id=34857. $array = !empty($array) ? array_combine($array, $array) : array(); - if (isset($callback) && is_callable($callback)) { + if (is_callable($callback)) { $array = array_map($callback, $array); } return $array;