Approval.

tl/appointment_attendance_modes.php

@@ -1,4 +1,10 @@
 <?PHP
-$appointment_attendance_modes['offline'] = 'Offline';
-$appointment_attendance_modes['online'] = 'Online';
-$appointment_attendance_modes['mixed'] = 'Offline and online';
+declare(strict_types = 1);
+array (
+  'appointment_attendance_modes' => 
+  array (
+    'offline' => 'Offline',
+    'online' => 'Online',
+    'mixed' => 'Offline and online',
+  ),
+)