enrol all users to a course

gistfile1.aw

<?php
define('CLI_SCRIPT', true);
require_once('config.php');
require_once($CFG->dirroot.'/user/lib.php');

define('COURSEID', 2);
define('STUDENTROLEID', 5);

$enrol = enrol_get_plugin('manual');
$enrolinstances = enrol_get_instances(COURSEID, true);

$rs = $DB->get_recordset_sql('SELECT id FROM {user} WHERE id > 2');
foreach ($rs as $r) {
    $enrol->enrol_user($enrolinstances[1], $r->id, STUDENTROLEID);
}

$rs->close();