C:/xampp/htdocs/moodle/auth/db/cli/sync_users.php

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<?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/>.

define('CLI_SCRIPT', true);

require(dirname(dirname(dirname(dirname(__FILE__)))).'/config.php');
require_once($CFG->dirroot.'/course/lib.php');
require_once($CFG->libdir.'/clilib.php');

// now get cli options
list($options, $unrecognized) = cli_get_params(array('noupdate'=>false, 'verbose'=>false, 'help'=>false), array('n'=>'noupdate', 'v'=>'verbose', 'h'=>'help'));

if ($unrecognized) {
    $unrecognized = implode("\n  ", $unrecognized);
    cli_error(get_string('cliunknowoption', 'admin', $unrecognized));
}

if ($options['help']) {
    $help =
"Execute user account sync with external database.
The auth_db plugin must be enabled and properly configured.

Options:
-n, --noupdate        Skip update of existing users
-v, --verbose         Print verbose progess information
-h, --help            Print out this help

Example:
\$sudo -u www-data /usr/bin/php auth/db/cli/sync_users.php

Sample cron entry:
# 5 minutes past 4am
5 4 * * * \$sudo -u www-data /usr/bin/php /var/www/moodle/auth/db/cli/sync_users.php
";

    echo $help;
    die;
}

if (!is_enabled_auth('db')) {
    echo "Plugin not enabled!";
    exit(1);
}

$verbose = !empty($options['verbose']);
$update = empty($options['noupdate']);

$dbauth = get_auth_plugin('db');
return $dbauth->sync_users($update, $verbose);