update

@@ -5,4 +5,7 @@ class StringUtils {
     public static function toUpper($text){
     public static function toUpper($text){
         return strtoupper($text);
         return strtoupper($text);
     }
     }
+    public static function toLower($text){
+        return strtolower($text);
+    }
 }
 }
\ No newline at end of file