diff --git a/lib/Util/Helpers.php b/lib/Util/Helpers.php
index f9ce39b06d..48fea28da8 100644
--- a/lib/Util/Helpers.php
+++ b/lib/Util/Helpers.php
@@ -134,14 +134,16 @@ class Helpers {
     if($capitalise_first_char) {
       $str[0] = strtoupper($str[0]);
     }
-    $func = create_function('$c', 'return strtoupper($c[1]);');
-    return preg_replace_callback('/_([a-z])/', $func, $str);
+    return preg_replace_callback('/_([a-z])/', function ($c) {
+      return strtoupper($c[1]);
+    }, $str);
   }
 
   static function camelCaseToUnderscore($str) {
     $str[0] = strtolower($str[0]);
-    $func = create_function('$c', 'return "_" . strtolower($c[1]);');
-    return preg_replace_callback('/([A-Z])/', $func, $str);
+    return preg_replace_callback('/([A-Z])/', function ($c) {
+      return "_" . strtolower($c[1]);
+    }, $str);
   }
 
   static function joinObject($object = array()) {