C:/xampp/htdocs/moodle/lib/ajax/setuserpref.php

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<?php

//                                                                       //
// NOTICE OF COPYRIGHT                                                   //
//                                                                       //
// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
//          http://moodle.org                                            //
//                                                                       //
// Copyright (C) 1999 onwards Martin Dougiamas  http://dougiamas.com     //
//                                                                       //
// This program 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 2 of the License, or     //
// (at your option) any later version.                                   //
//                                                                       //
// This program 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:                          //
//                                                                       //
//          http://www.gnu.org/copyleft/gpl.html                         //
//                                                                       //

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

// Check access.
if (!confirm_sesskey()) {
    print_error('invalidsesskey');
}

// Get the name of the preference to update, and check it is allowed.
$name = required_param('pref', PARAM_RAW);
if (!isset($USER->ajax_updatable_user_prefs[$name])) {
    print_error('notallowedtoupdateprefremotely');
}

// Get and the value.
$value = required_param('value', $USER->ajax_updatable_user_prefs[$name]);

// Update
if (!set_user_preference($name, $value)) {
    print_error('errorsettinguserpref');
}

echo 'OK';