diff --git a/core/rebuild.php b/core/rebuild.php
index da357ec..eee03e7 100644
--- a/core/rebuild.php
+++ b/core/rebuild.php
@@ -44,16 +44,14 @@
   )) {
   // Clear user cache for all major platforms.
   $user_caches = [
-    'apc_clear_cache' => ['user'],
-    'apcu_clear_cache' => [],
-    'wincache_ucache_clear' => [],
-    'xcache_clear_cache' => [],
+    'apc_clear_cache',
+    'apcu_clear_cache',
+    'wincache_ucache_clear',
+    'xcache_clear_cache',
   ];
-  foreach ($user_caches as $name => $args) {
-    if (is_callable($name)) {
-      call_user_func_array($name, $args);
-    }
-  }
+  array_walk(array_filter($user_caches, 'is_callable'), 'call_user_func');
+});
+
   drupal_rebuild($autoloader, $request);
   drupal_set_message('Cache rebuild complete.');
 }