From 017b1252edd73a38517c230c1a28263b263ebd91 Mon Sep 17 00:00:00 2001
From: Thong Bui <Thong.BuiVoQuoc@nashtechglobal.com>
Date: Tue, 1 Dec 2020 16:02:18 +0700
Subject: [PATCH] MDL-70324 Question: get_all_response_file_areas() not work
 correctly

---
 question/engine/lib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/question/engine/lib.php b/question/engine/lib.php
index cc8ebc2b473..b1f21d93af3 100644
--- a/question/engine/lib.php
+++ b/question/engine/lib.php
@@ -432,7 +432,7 @@ abstract class question_engine {
     public static function get_all_response_file_areas() {
         $variables = array();
         foreach (question_bank::get_all_qtypes() as $qtype) {
-            $variables += $qtype->response_file_areas();
+            $variables = array_merge($variables, $qtype->response_file_areas());
         }
 
         $areas = array();