add field to export that lists groups that a user is a member of.

export.php

@@ -90,6 +90,9 @@ if ($mform->is_submitted()) {
         }
         $data->tabhead[] = get_string('lastname');
         $data->tabhead[] = get_string('firstname');
+        if (!empty($cm->groupmode)) {
+            $data->tabhead[] = get_string('groups');
+        }
 
 
         if (count($reportdata->sessions) > 0) {
@@ -120,6 +123,15 @@ if ($mform->is_submitted()) {
             }
             $data->table[$i][] = $user->lastname;
             $data->table[$i][] = $user->firstname;
+            if (!empty($cm->groupmode)) {
+                $grouptext = '';
+                $groupsraw = groups_get_all_groups($course->id, $user->id, 0, 'g.name');
+                $groups = array();
+                foreach ($groupsraw as $group) {
+                    $groups[] = $group->name;;
+                }
+                $data->table[$i][] = implode(', ', $groups);
+            }
             $cellsgenerator = new user_sessions_cells_text_generator($reportdata, $user);
             $data->table[$i] = array_merge($data->table[$i], $cellsgenerator->get_cells(isset($formdata->includeremarks)));
             if ($reportdata->gradable) {