ajax.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * AJAX for Alpha Mail
 *
 * @package    tool_alpha_mail
 * @copyright  2018 Cameron Ball <cameron@cameron1729.xyz>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define('AJAX_SCRIPT', true);

require_once('../../../config.php');

$DB->execute("UPDATE {tool_alpha_mail_messages} set read = 1 WHERE userid=:userid", ['userid' => $USER->id]);

echo json_encode(
    (object)[
        'success' => true,
        'response' => new stdClass,
        'error' => ''
    ]
);

die();