From 1130c181f95effbff024a3cbd78033f57af6db31 Mon Sep 17 00:00:00 2001
From: Jean-Michel Vedrine <vedrine@vedrine.org>
Date: Fri, 23 May 2014 23:08:36 +0200
Subject: [PATCH] MDL-45686 qtype_multichoice get_num_selected_choices return
 wrong result

---
 question/type/multichoice/question.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/question/type/multichoice/question.php b/question/type/multichoice/question.php
index 58a21364bed..c73969c2588 100644
--- a/question/type/multichoice/question.php
+++ b/question/type/multichoice/question.php
@@ -414,7 +414,8 @@ class qtype_multichoice_multi_question extends qtype_multichoice_base {
     public function get_num_selected_choices(array $response) {
         $numselected = 0;
         foreach ($response as $key => $value) {
-            if (!empty($value)) {
+            // Response keys starting with _ are internal values like _order, so ignore them.
+            if (!empty($value) && $key[0] != '_') {
                 $numselected += 1;
             }
         }