General help

re:  [14-Jun-2018 14:21:36 zzzzzzz] PHP Notice:  Undefined variable: errormessage in zzzzzzzz\message\externallib.php on line 164

Line 164 refers to bold line below:

if ($success) {
                $resultmsg['msgid'] = $success;
} else {
                // WARNINGS: for backward compatibility we return this errormessage.
                //          We should have thrown exceptions as these errors prevent results to be returned.
                // See http://docs.moodle.org/dev/Errors_handling_in_web_services#When_to_send_a_warning_on_the_server_side .
                $resultmsg['msgid'] = -1;
                $resultmsg['errormessage'] = $errormessage;
 }

Not very encouraging, no $success and the error message doesnt work either. Ill try to find out where $success is at least changed to false, looks like 3 possible locations for that, line 141,131,125

            // Check if the user is a contact
            //TODO MDL-31118 performance improvement - edit the function so we can pass an array instead userid
            $blocknoncontacts = get_user_preferences('message_blocknoncontacts', NULL, $message['touserid']);
            // message_blocknoncontacts option is on and current user is not in contact list
            if ($success && empty($contactlist[$message['touserid']]) && !empty($blocknoncontacts)) {
                // The user isn't a contact and they have selected to block non contacts so this message won't be sent.
                $success = false;
                $errormessage = get_string('userisblockingyounoncontact', 'message',
                        fullname(core_user::get_user($message['touserid'])));
            }

            //check that the touser is not blocking the current user
            if ($success and !empty($blocklist[$message['touserid']]) and !$canreadallmessages) {
                $success = false;
                $errormessage = get_string('userisblockingyou', 'message');
            }

            //check the user exists
            if (empty($tousers[$message['touserid']])) {
                $success = false;
                $errormessage = get_string('touserdoesntexist', 'message', $message['touserid']);
            }

Tried to send a message to all class participants from a Teacher and received the following message indicating no messages were sent.

Moodle Debugging is set at Developer level.

re: [14-Jun-2018 14:21:36 zzzzzzz] PHP Notice:  Undefined variable: errormessage in zzzzzzzz\message\externallib.php on line 164

In addition to the undefined variable error (for every message attempting now) in php I also generate a related messaging error occasioanally:

[15-Jun-2018 09:25:36 zzzz] PHP Notice:  Trying to get property of non-object in zzzzz\message\classes\output\messagearea\message.php on line 87 (and lines 88,89,90,91,92,93,94)

I can add a Contact but same results, send the message, doesn't show up in message list and after a page reload its gone.

Downgraded php from 7.1 to 7.0 , the same results though.

Prior to this update I also performed the UTF8mb4 conversion, not sure if it related, thought ild mention it anyways.

May try downgrading php again from 7.0 to 5.6 and if that doesn't work try Moodle 3.3->3.4 (or 3.2, its a dev environment so its ok to try)

browser developer tools suggest messages are submitted to and received from lib/ajax/service.php successfully with 200 response codes, response body not sure what to say.

'timesent' indicates '9:53 AM', not sure where that time is coming from, my local time is 3:43PM.