MDL-76661 mod_bigbluebuttonbn: fix meeting attendee role comparison.

mod/bigbluebuttonbn/classes/meeting.php

@@ -131,9 +131,9 @@ class meeting {
     /**
      * Get meeting attendees
      *
-     * @return mixed
+     * @return array[]
      */
-    public function get_attendees() {
+    public function get_attendees(): array {
         return $this->get_meeting_info()->attendees ?? [];
     }
 
@@ -276,7 +276,7 @@ class meeting {
         }
         $meetinginfo->attendees = [];
         if (!empty($info['attendees'])) {
-            // Make sure attendees is an array of object, not a simpleXML object.
+            // Ensure each returned attendee is cast to an array, rather than a simpleXML object.
             foreach ($info['attendees'] as $attendee) {
                 $meetinginfo->attendees[] = (array) $attendee;
             }

mod/bigbluebuttonbn/classes/output/index.php

@@ -175,9 +175,10 @@ class index implements renderable {
     protected function get_room_attendee_list(meeting $meeting, string $role): string {
         $attendees = [];
 
+        // Iterate attendees, matching by their "role" property.
         foreach ($meeting->get_attendees() as $attendee) {
-            if ((string) $attendee->role == $role) {
-                $attendees[] = $attendee->fullName;
+            if (strcmp((string) $attendee['role'], $role) === 0) {
+                $attendees[] = $attendee['fullName'];
             }
         }