PHP groups_delete_group_members函数代码示例

 public function test_groups_delete_group_members()
 {
     global $DB;
     $this->resetAfterTest();
     $course = $this->getDataGenerator()->create_course();
     $user1 = $this->getDataGenerator()->create_user();
     $user2 = $this->getDataGenerator()->create_user();
     $this->getDataGenerator()->enrol_user($user1->id, $course->id);
     $this->getDataGenerator()->enrol_user($user2->id, $course->id);
     $group1 = $this->getDataGenerator()->create_group(array('courseid' => $course->id));
     $group2 = $this->getDataGenerator()->create_group(array('courseid' => $course->id));
     // Test deletion of all the users.
     $this->getDataGenerator()->create_group_member(array('groupid' => $group1->id, 'userid' => $user1->id));
     $this->getDataGenerator()->create_group_member(array('groupid' => $group2->id, 'userid' => $user1->id));
     $this->getDataGenerator()->create_group_member(array('groupid' => $group1->id, 'userid' => $user2->id));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user1->id)));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group2->id, 'userid' => $user1->id)));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user2->id)));
     groups_delete_group_members($course->id);
     $this->assertFalse($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user1->id)));
     $this->assertFalse($DB->record_exists('groups_members', array('groupid' => $group2->id, 'userid' => $user1->id)));
     $this->assertFalse($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user2->id)));
     // Test deletion of a specific user.
     $this->getDataGenerator()->create_group_member(array('groupid' => $group1->id, 'userid' => $user1->id));
     $this->getDataGenerator()->create_group_member(array('groupid' => $group2->id, 'userid' => $user1->id));
     $this->getDataGenerator()->create_group_member(array('groupid' => $group1->id, 'userid' => $user2->id));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user1->id)));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group2->id, 'userid' => $user1->id)));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user2->id)));
     groups_delete_group_members($course->id, $user2->id);
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user1->id)));
     $this->assertTrue($DB->record_exists('groups_members', array('groupid' => $group2->id, 'userid' => $user1->id)));
     $this->assertFalse($DB->record_exists('groups_members', array('groupid' => $group1->id, 'userid' => $user2->id)));
 }

/**
 * This function will empty a course of user data.
 * It will retain the activities and the structure of the course.
 * @param object $data an object containing all the settings including courseid (without magic quotes)
 * @return array status array of array component, item, error
 */
function reset_course_userdata($data)
{
    global $CFG, $USER;
    require_once $CFG->libdir . '/gradelib.php';
    require_once $CFG->dirroot . '/group/lib.php';
    $data->courseid = $data->id;
    $context = get_context_instance(CONTEXT_COURSE, $data->courseid);
    // calculate the time shift of dates
    if (!empty($data->reset_start_date)) {
        // time part of course startdate should be zero
        $data->timeshift = $data->reset_start_date - usergetmidnight($data->reset_start_date_old);
    } else {
        $data->timeshift = 0;
    }
    // result array: component, item, error
    $status = array();
    // start the resetting
    $componentstr = get_string('general');
    // move the course start time
    if (!empty($data->reset_start_date) and $data->timeshift) {
        // change course start data
        set_field('course', 'startdate', $data->reset_start_date, 'id', $data->courseid);
        // update all course and group events - do not move activity events
        $updatesql = "UPDATE {$CFG->prefix}event\n                         SET timestart = timestart + ({$data->timeshift})\n                       WHERE courseid={$data->courseid} AND instance=0";
        execute_sql($updatesql, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('datechanged'), 'error' => false);
    }
    if (!empty($data->reset_logs)) {
        delete_records('log', 'course', $data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('deletelogs'), 'error' => false);
    }
    if (!empty($data->reset_events)) {
        delete_records('event', 'courseid', $data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteevents', 'calendar'), 'error' => false);
    }
    if (!empty($data->reset_notes)) {
        require_once $CFG->dirroot . '/notes/lib.php';
        note_delete_all($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('deletenotes', 'notes'), 'error' => false);
    }
    $componentstr = get_string('roles');
    if (!empty($data->reset_roles_overrides)) {
        $children = get_child_contexts($context);
        foreach ($children as $child) {
            delete_records('role_capabilities', 'contextid', $child->id);
        }
        delete_records('role_capabilities', 'contextid', $context->id);
        //force refresh for logged in users
        mark_context_dirty($context->path);
        $status[] = array('component' => $componentstr, 'item' => get_string('deletecourseoverrides', 'role'), 'error' => false);
    }
    if (!empty($data->reset_roles_local)) {
        $children = get_child_contexts($context);
        foreach ($children as $child) {
            role_unassign(0, 0, 0, $child->id);
        }
        //force refresh for logged in users
        mark_context_dirty($context->path);
        $status[] = array('component' => $componentstr, 'item' => get_string('deletelocalroles', 'role'), 'error' => false);
    }
    // First unenrol users - this cleans some of related user data too, such as forum subscriptions, tracking, etc.
    $data->unenrolled = array();
    if (!empty($data->reset_roles)) {
        foreach ($data->reset_roles as $roleid) {
            if ($users = get_role_users($roleid, $context, false, 'u.id', 'u.id ASC')) {
                foreach ($users as $user) {
                    role_unassign($roleid, $user->id, 0, $context->id);
                    if (!has_capability('moodle/course:view', $context, $user->id)) {
                        $data->unenrolled[$user->id] = $user->id;
                    }
                }
            }
        }
    }
    if (!empty($data->unenrolled)) {
        $status[] = array('component' => $componentstr, 'item' => get_string('unenrol') . ' (' . count($data->unenrolled) . ')', 'error' => false);
    }
    $componentstr = get_string('groups');
    // remove all group members
    if (!empty($data->reset_groups_members)) {
        groups_delete_group_members($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupsmembers', 'group'), 'error' => false);
    }
    // remove all groups
    if (!empty($data->reset_groups_remove)) {
        groups_delete_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroups', 'group'), 'error' => false);
    }
    // remove all grouping members
    if (!empty($data->reset_groupings_members)) {
        groups_delete_groupings_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupingsmembers', 'group'), 'error' => false);
    }
    // remove all groupings
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            }
        }
        foreach ($data->unenrol_users as $withroleid) {
            if ($withroleid) {
                $sql = "SELECT ue.*\n                          FROM {user_enrolments} ue\n                          JOIN {enrol} e ON (e.id = ue.enrolid AND e.courseid = :courseid)\n                          JOIN {context} c ON (c.contextlevel = :courselevel AND c.instanceid = e.courseid)\n                          JOIN {role_assignments} ra ON (ra.contextid = c.id AND ra.roleid = :roleid AND ra.userid = ue.userid)";
                $params = array('courseid' => $data->courseid, 'roleid' => $withroleid, 'courselevel' => CONTEXT_COURSE);
            } else {
                // Without any role assigned at course context.
                $sql = "SELECT ue.*\n                          FROM {user_enrolments} ue\n                          JOIN {enrol} e ON (e.id = ue.enrolid AND e.courseid = :courseid)\n                          JOIN {context} c ON (c.contextlevel = :courselevel AND c.instanceid = e.courseid)\n                     LEFT JOIN {role_assignments} ra ON (ra.contextid = c.id AND ra.userid = ue.userid)\n                         WHERE ra.id IS null";
                $params = array('courseid' => $data->courseid, 'courselevel' => CONTEXT_COURSE);
            }
            $rs = $DB->get_recordset_sql($sql, $params);
            foreach ($rs as $ue) {
                if (!isset($instances[$ue->enrolid])) {
                    continue;
                }
                $instance = $instances[$ue->enrolid];
                $plugin = $plugins[$instance->enrol];
                if (!$plugin->allow_unenrol($instance) and !$plugin->allow_unenrol_user($instance, $ue)) {
                    continue;
                }
                $plugin->unenrol_user($instance, $ue->userid);
                $data->unenrolled[$ue->userid] = $ue->userid;
            }
            $rs->close();
        }
    }
    if (!empty($data->unenrolled)) {
        $status[] = array('component' => $componentstr, 'item' => get_string('unenrol', 'enrol') . ' (' . count($data->unenrolled) . ')', 'error' => false);
    }
    $componentstr = get_string('groups');
    // Remove all group members.
    if (!empty($data->reset_groups_members)) {
        groups_delete_group_members($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupsmembers', 'group'), 'error' => false);
    }
    // Remove all groups.
    if (!empty($data->reset_groups_remove)) {
        groups_delete_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroups', 'group'), 'error' => false);
    }
    // Remove all grouping members.
    if (!empty($data->reset_groupings_members)) {
        groups_delete_groupings_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupingsmembers', 'group'), 'error' => false);
    }
    // Remove all groupings.
    if (!empty($data->reset_groupings_remove)) {
        groups_delete_groupings($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroupings', 'group'), 'error' => false);
    }
    // Look in every instance of every module for data to delete.
    $unsupportedmods = array();
    if ($allmods = $DB->get_records('modules')) {
        foreach ($allmods as $mod) {
            $modname = $mod->name;
            $modfile = $CFG->dirroot . '/mod/' . $modname . '/lib.php';
            $moddeleteuserdata = $modname . '_reset_userdata';
            // Function to delete user data.
            if (file_exists($modfile)) {
                if (!$DB->count_records($modname, array('course' => $data->courseid))) {
                    continue;
                    // Skip mods with no instances.
                }
                include_once $modfile;
                if (function_exists($moddeleteuserdata)) {

 /**
  * Unenrol user from course,
  * the last unenrolment removes all remaining roles.
  *
  * @param stdClass $instance
  * @param int $userid
  * @return void
  */
 public function unenrol_user(stdClass $instance, $userid)
 {
     global $CFG, $USER, $DB;
     require_once "{$CFG->dirroot}/group/lib.php";
     $name = $this->get_name();
     $courseid = $instance->courseid;
     if ($instance->enrol !== $name) {
         throw new coding_exception('invalid enrol instance!');
     }
     $context = context_course::instance($instance->courseid, MUST_EXIST);
     if (!($ue = $DB->get_record('user_enrolments', array('enrolid' => $instance->id, 'userid' => $userid)))) {
         // weird, user not enrolled
         return;
     }
     // Remove all users groups linked to this enrolment instance.
     if ($gms = $DB->get_records('groups_members', array('userid' => $userid, 'component' => 'enrol_' . $name, 'itemid' => $instance->id))) {
         foreach ($gms as $gm) {
             groups_remove_member($gm->groupid, $gm->userid);
         }
     }
     role_unassign_all(array('userid' => $userid, 'contextid' => $context->id, 'component' => 'enrol_' . $name, 'itemid' => $instance->id));
     $DB->delete_records('user_enrolments', array('id' => $ue->id));
     // add extra info and trigger event
     $ue->courseid = $courseid;
     $ue->enrol = $name;
     $sql = "SELECT 'x'\n                  FROM {user_enrolments} ue\n                  JOIN {enrol} e ON (e.id = ue.enrolid)\n                 WHERE ue.userid = :userid AND e.courseid = :courseid";
     if ($DB->record_exists_sql($sql, array('userid' => $userid, 'courseid' => $courseid))) {
         $ue->lastenrol = false;
         events_trigger('user_unenrolled', $ue);
         // user still has some enrolments, no big cleanup yet
     } else {
         // the big cleanup IS necessary!
         require_once "{$CFG->libdir}/gradelib.php";
         // remove all remaining roles
         role_unassign_all(array('userid' => $userid, 'contextid' => $context->id), true, false);
         //clean up ALL invisible user data from course if this is the last enrolment - groups, grades, etc.
         groups_delete_group_members($courseid, $userid);
         grade_user_unenrol($courseid, $userid);
         $DB->delete_records('user_lastaccess', array('userid' => $userid, 'courseid' => $courseid));
         $ue->lastenrol = true;
         // means user not enrolled any more
         events_trigger('user_unenrolled', $ue);
     }
     // reset all enrol caches
     $context->mark_dirty();
     // reset current user enrolment caching
     if ($userid == $USER->id) {
         if (isset($USER->enrol['enrolled'][$courseid])) {
             unset($USER->enrol['enrolled'][$courseid]);
         }
         if (isset($USER->enrol['tempguest'][$courseid])) {
             unset($USER->enrol['tempguest'][$courseid]);
             remove_temp_course_roles($context);
         }
     }
 }

//.........这里部分代码省略.........
    $data->unenrolled = array();
    if (!empty($data->unenrol_users)) {
        $plugins = enrol_get_plugins(true);
        $instances = enrol_get_instances($data->courseid, true);
        foreach ($instances as $key => $instance) {
            if (!isset($plugins[$instance->enrol])) {
                unset($instances[$key]);
                continue;
            }
            if (!$plugins[$instance->enrol]->allow_unenrol($instance)) {
                unset($instances[$key]);
            }
        }
        $sqlempty = $DB->sql_empty();
        foreach ($data->unenrol_users as $withroleid) {
            $sql = "SELECT DISTINCT ue.userid, ue.enrolid\n                      FROM {user_enrolments} ue\n                      JOIN {enrol} e ON (e.id = ue.enrolid AND e.courseid = :courseid)\n                      JOIN {context} c ON (c.contextlevel = :courselevel AND c.instanceid = e.courseid)\n                      JOIN {role_assignments} ra ON (ra.contextid = c.id AND ra.roleid = :roleid AND ra.userid = ue.userid)";
            $params = array('courseid' => $data->courseid, 'roleid' => $withroleid, 'courselevel' => CONTEXT_COURSE);
            $rs = $DB->get_recordset_sql($sql, $params);
            foreach ($rs as $ue) {
                if (!isset($instances[$ue->enrolid])) {
                    continue;
                }
                $plugins[$instances[$ue->enrolid]->enrol]->unenrol_user($instances[$ue->enrolid], $ue->userid);
                $data->unenrolled[$ue->userid] = $ue->userid;
            }
        }
    }
    if (!empty($data->unenrolled)) {
        $status[] = array('component' => $componentstr, 'item' => get_string('unenrol', 'enrol') . ' (' . count($data->unenrolled) . ')', 'error' => false);
    }
    $componentstr = get_string('groups');
    // remove all group members
    if (!empty($data->reset_groups_members)) {
        groups_delete_group_members($data->courseid);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupsmembers', 'group'), 'error' => false);
    }
    // remove all groups
    if (!empty($data->reset_groups_remove)) {
        groups_delete_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroups', 'group'), 'error' => false);
    }
    // remove all grouping members
    if (!empty($data->reset_groupings_members)) {
        groups_delete_groupings_groups($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('removegroupingsmembers', 'group'), 'error' => false);
    }
    // remove all groupings
    if (!empty($data->reset_groupings_remove)) {
        groups_delete_groupings($data->courseid, false);
        $status[] = array('component' => $componentstr, 'item' => get_string('deleteallgroupings', 'group'), 'error' => false);
    }
    // Look in every instance of every module for data to delete
    $unsupported_mods = array();
    if ($allmods = $DB->get_records('modules')) {
        foreach ($allmods as $mod) {
            $modname = $mod->name;
            if (!$DB->count_records($modname, array('course' => $data->courseid))) {
                continue;
                // skip mods with no instances
            }
            $modfile = $CFG->dirroot . '/mod/' . $modname . '/lib.php';
            $moddeleteuserdata = $modname . '_reset_userdata';
            // Function to delete user data
            if (file_exists($modfile)) {
                include_once $modfile;
                if (function_exists($moddeleteuserdata)) {

/**
 * Delete all groups from course
 * @param int $courseid
 * @param bool $showfeedback
 * @return bool success
 */
function groups_delete_groups($courseid, $showfeedback = false)
{
    global $CFG;
    require_once $CFG->libdir . '/gdlib.php';
    $groupssql = "SELECT id FROM {$CFG->prefix}groups g WHERE g.courseid = {$courseid}";
    // delete any uses of groups
    groups_delete_groupings_groups($courseid, $showfeedback);
    groups_delete_group_members($courseid, 0, $showfeedback);
    // delete group pictures
    if ($groups = get_records('groups', 'courseid', $courseid)) {
        foreach ($groups as $group) {
            delete_profile_image($group->id, 'groups');
        }
    }
    // delete group calendar events
    delete_records_select('event', "groupid IN ({$groupssql})");
    delete_records('groups', 'courseid', $courseid);
    //trigger groups events
    events_trigger('groups_groups_deleted', $courseid);
    if ($showfeedback) {
        notify(get_string('deleted') . ' groups');
    }
    return true;
}

/**
 * Deletes one or more role assignments.   You must specify at least one parameter.
 * @param $roleid
 * @param $userid
 * @param $groupid
 * @param $contextid
 * @param $enrol unassign only if enrolment type matches, NULL means anything
 * @return boolean - success or failure
 */
function role_unassign($roleid = 0, $userid = 0, $groupid = 0, $contextid = 0, $enrol = NULL)
{
    global $USER, $CFG, $DB;
    require_once $CFG->dirroot . '/group/lib.php';
    $success = true;
    $args = array('roleid', 'userid', 'groupid', 'contextid');
    $select = array();
    $params = array();
    foreach ($args as $arg) {
        if (${$arg}) {
            $select[] = "{$arg} = ?";
            $params[] = ${$arg};
        }
    }
    if (!empty($enrol)) {
        $select[] = "enrol=?";
        $params[] = $enrol;
    }
    if ($select) {
        if ($ras = $DB->get_records_select('role_assignments', implode(' AND ', $select), $params)) {
            $mods = get_list_of_plugins('mod');
            foreach ($ras as $ra) {
                $fireevent = false;
                /// infinite loop protection when deleting recursively
                if (!($ra = $DB->get_record('role_assignments', array('id' => $ra->id)))) {
                    continue;
                }
                if ($DB->delete_records('role_assignments', array('id' => $ra->id))) {
                    $fireevent = true;
                } else {
                    $success = false;
                }
                if (!($context = get_context_instance_by_id($ra->contextid))) {
                    // strange error, not much to do
                    continue;
                }
                /* mark contexts as dirty here, because we need the refreshed
                 * caps bellow to delete group membership and user_lastaccess!
                 * and yes, this is very expensive for bulk operations :-(
                 */
                mark_context_dirty($context->path);
                /// If the user is the current user, then do full reload of capabilities too.
                if (!empty($USER->id) && $USER->id == $ra->userid) {
                    load_all_capabilities();
                }
                /// Ask all the modules if anything needs to be done for this user
                foreach ($mods as $mod) {
                    include_once $CFG->dirroot . '/mod/' . $mod . '/lib.php';
                    $functionname = $mod . '_role_unassign';
                    if (function_exists($functionname)) {
                        $functionname($ra->userid, $context);
                        // watch out, $context might be NULL if something goes wrong
                    }
                }
                /// now handle metacourse role unassigment and removing from goups if in course context
                if ($context->contextlevel == CONTEXT_COURSE) {
                    // cleanup leftover course groups/subscriptions etc when user has
                    // no capability to view course
                    // this may be slow, but this is the proper way of doing it
                    if (!has_capability('moodle/course:view', $context, $ra->userid)) {
                        // remove from groups
                        groups_delete_group_members($context->instanceid, $ra->userid);
                        // delete lastaccess records
                        $DB->delete_records('user_lastaccess', array('userid' => $ra->userid, 'courseid' => $context->instanceid));
                    }
                    //unassign roles in metacourses if needed
                    if ($parents = $DB->get_records('course_meta', array('child_course' => $context->instanceid))) {
                        foreach ($parents as $parent) {
                            sync_metacourse($parent->parent_course);
                        }
                    }
                }
                if ($fireevent) {
                    events_trigger('role_unassigned', $ra);
                }
            }
        }
    }
    return $success;
}

function groups_delete_groups($courseid, $showfeedback = false)
{
    global $CFG;
    require_once $CFG->libdir . '/gdlib.php';
    // delete any uses of groups
    $sql = "DELETE FROM {$CFG->prefix}groupings_groups\n             WHERE groupid in (SELECT id FROM {$CFG->prefix}groups g WHERE g.courseid = {$courseid})";
    execute_sql($sql, false);
    groups_delete_group_members($courseid, false);
    // delete group pictures
    if ($groups = get_records('groups', 'courseid', $courseid)) {
        foreach ($groups as $group) {
            delete_profile_image($group->id, 'groups');
        }
    }
    delete_records('groups', 'courseid', $courseid);
    if ($showfeedback) {
        notify(get_string('deleted') . ' groups');
    }
    return true;
}

/**
 * Delete all groups from course
 *
 * @param int $courseid
 * @param bool $showfeedback
 * @return bool success
 */
function groups_delete_groups($courseid, $showfeedback = false)
{
    global $CFG, $DB, $OUTPUT;
    // delete any uses of groups
    // Any associated files are deleted as part of groups_delete_groupings_groups
    groups_delete_groupings_groups($courseid, $showfeedback);
    groups_delete_group_members($courseid, 0, $showfeedback);
    // delete group pictures and descriptions
    $context = context_course::instance($courseid);
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'group');
    // delete group calendar events
    $groupssql = "SELECT id FROM {groups} g WHERE g.courseid = ?";
    $DB->delete_records_select('event', "groupid IN ({$groupssql})", array($courseid));
    $context = context_course::instance($courseid);
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'group');
    $DB->delete_records('groups', array('courseid' => $courseid));
    // Invalidate the grouping cache for the course
    cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
    // trigger groups events
    events_trigger('groups_groups_deleted', $courseid);
    if ($showfeedback) {
        echo $OUTPUT->notification(get_string('deleted') . ' - ' . get_string('groups', 'group'), 'notifysuccess');
    }
    return true;
}

//.........这里部分代码省略.........
    foreach ($backupsettings as $name => $value) {
        $setting = $rc->get_plan()->get_setting($name);
        if ($setting->get_status() == backup_setting::NOT_LOCKED) {
            $setting->set_value($value);
        }
    }
    if (!$rc->execute_precheck()) {
        $precheckresults = $rc->get_precheck_results();
        if (is_array($precheckresults) && !empty($precheckresults['errors'])) {
            if (empty($CFG->keeptempdirectoriesonbackup)) {
                fulldelete($backupbasepath);
            }
            $errorinfo = '';
            foreach ($precheckresults['errors'] as $error) {
                $errorinfo .= $error;
            }
            if (array_key_exists('warnings', $precheckresults)) {
                foreach ($precheckresults['warnings'] as $warning) {
                    $errorinfo .= $warning;
                }
            }
            throw new moodle_exception('backupprecheckerrors', 'webservice', '', $errorinfo);
        }
    }
    $rc->execute_plan();
    $rc->destroy();
    $course = $DB->get_record('course', array('id' => $newcourse->id), '*', MUST_EXIST);
    $course->visible = $visible;
    $course->fullname = $newcourse->fullname;
    $course->shortname = $newcourse->shortname;
    $course->idnumber = $newcourse->idnumber;
    // Set shortname and fullname back.
    $DB->update_record('course', $course);
    if (empty($CFG->keeptempdirectoriesonbackup)) {
        fulldelete($backupbasepath);
    }
    // Delete the course backup file created by this WebService. Originally located in the course backups area.
    $file->delete();
    // We have to unenroll all the user except the one that create the course.
    if (get_config('local_ltiprovider', 'duplicatecourseswithoutusers') and $useridcreating) {
        require_once $CFG->dirroot . '/group/lib.php';
        // Previous to unenrol users, we assign some type of activities to the user that created the course.
        if ($user = $DB->get_record('user', array('id' => $useridcreating))) {
            if ($databases = $DB->get_records('data', array('course' => $course->id))) {
                foreach ($databases as $data) {
                    $DB->execute("UPDATE {data_records} SET userid = ? WHERE dataid = ?", array($user->id, $data->id));
                }
            }
            if ($glossaries = $DB->get_records('glossary', array('course' => $course->id))) {
                foreach ($glossaries as $glossary) {
                    $DB->execute("UPDATE {glossary_entries} SET userid = ? WHERE glossaryid = ?", array($user->id, $glossary->id));
                }
            }
            // Same for questions.
            $newcoursecontextid = context_course::instance($course->id);
            if ($qcategories = $DB->get_records('question_categories', array('contextid' => $newcoursecontextid->id))) {
                foreach ($qcategories as $qcategory) {
                    $DB->execute("UPDATE {question} SET createdby = ?, modifiedby = ? WHERE category = ?", array($user->id, $user->id, $qcategory->id));
                }
            }
            // Enrol the user.
            if ($tool = $DB->get_record('local_ltiprovider', array('contextid' => $newcoursecontextid->id))) {
                $roles = explode(',', strtolower($context->info['roles']));
                local_ltiprovider_enrol_user($tool, $user, $roles, true);
            }
            // Now, we unenrol all the users except the one who created the course.
            $plugins = enrol_get_plugins(true);
            $instances = enrol_get_instances($course->id, true);
            foreach ($instances as $key => $instance) {
                if (!isset($plugins[$instance->enrol])) {
                    unset($instances[$key]);
                    continue;
                }
            }
            $sql = "SELECT ue.*\n                          FROM {user_enrolments} ue\n                          JOIN {enrol} e ON (e.id = ue.enrolid AND e.courseid = :courseid)\n                          JOIN {context} c ON (c.contextlevel = :courselevel AND c.instanceid = e.courseid)";
            $params = array('courseid' => $course->id, 'courselevel' => CONTEXT_COURSE);
            $rs = $DB->get_recordset_sql($sql, $params);
            foreach ($rs as $ue) {
                if ($ue->userid == $user->id) {
                    continue;
                }
                if (!isset($instances[$ue->enrolid])) {
                    continue;
                }
                $instance = $instances[$ue->enrolid];
                $plugin = $plugins[$instance->enrol];
                if (!$plugin->allow_unenrol($instance) and !$plugin->allow_unenrol_user($instance, $ue)) {
                    continue;
                }
                $plugin->unenrol_user($instance, $ue->userid);
            }
            $rs->close();
            groups_delete_group_members($course->id);
            groups_delete_groups($course->id, false);
            groups_delete_groupings_groups($course->id, false);
            groups_delete_groupings($course->id, false);
        }
    }
    return $course;
}

    /**
     * Unenrol user from course,
     * the last unenrolment removes all remaining roles.
     *
     * @param stdClass $instance
     * @param int $userid
     * @return void
     */
    public function unenrol_user(stdClass $instance, $userid) {
        global $CFG, $USER, $DB;

        $name = $this->get_name();
        $courseid = $instance->courseid;

        if ($instance->enrol !== $name) {
            throw new coding_exception('invalid enrol instance!');
        }
        $context = get_context_instance(CONTEXT_COURSE, $instance->courseid, MUST_EXIST);

        if (!$ue = $DB->get_record('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$userid))) {
            // weird, user not enrolled
            return;
        }

        role_unassign_all(array('userid'=>$userid, 'contextid'=>$context->id, 'component'=>'enrol_'.$name, 'itemid'=>$instance->id));
        $DB->delete_records('user_enrolments', array('id'=>$ue->id));

        // add extra info and trigger event
        $ue->courseid  = $courseid;
        $ue->enrol     = $name;

        $sql = "SELECT 'x'
                  FROM {user_enrolments} ue
                  JOIN {enrol} e ON (e.id = ue.enrolid)
                  WHERE ue.userid = :userid AND e.courseid = :courseid";
        if ($DB->record_exists_sql($sql, array('userid'=>$userid, 'courseid'=>$courseid))) {
            $ue->lastenrol = false;
            events_trigger('user_unenrolled', $ue);
            // user still has some enrolments, no big cleanup yet
        } else {
            // the big cleanup IS necessary!

            require_once("$CFG->dirroot/group/lib.php");
            require_once("$CFG->libdir/gradelib.php");

            // remove all remaining roles
            role_unassign_all(array('userid'=>$userid, 'contextid'=>$context->id), true, false);

            //clean up ALL invisible user data from course if this is the last enrolment - groups, grades, etc.
            groups_delete_group_members($courseid, $userid);

            grade_user_unenrol($courseid, $userid);

            $DB->delete_records('user_lastaccess', array('userid'=>$userid, 'courseid'=>$courseid));

            $ue->lastenrol = true; // means user not enrolled any more
            events_trigger('user_unenrolled', $ue);
        }
        // reset primitive require_login() caching
        if ($userid == $USER->id) {
            if (isset($USER->enrol['enrolled'][$courseid])) {
                unset($USER->enrol['enrolled'][$courseid]);
            }
            if (isset($USER->enrol['tempguest'][$courseid])) {
                unset($USER->enrol['tempguest'][$courseid]);
                $USER->access = remove_temp_roles($context, $USER->access);
            }
        }
    }

/**
* This function will empty a course of USER data as much as
/// possible. It will retain the activities and the structure
/// of the course.
*
* @uses $USER
* @uses $SESSION
* @uses $CFG
* @param object $data an object containing all the boolean settings and courseid
* @param bool $showfeedback  if false then do it all silently
* @return bool
* @todo Finish documenting this function
*/
function reset_course_userdata($data, $showfeedback = true)
{
    global $CFG, $USER, $SESSION;
    require_once $CFG->dirroot . '/group/lib.php';
    $result = true;
    $strdeleted = get_string('deleted');
    // Look in every instance of every module for data to delete
    if ($allmods = get_records('modules')) {
        foreach ($allmods as $mod) {
            $modname = $mod->name;
            $modfile = $CFG->dirroot . '/mod/' . $modname . '/lib.php';
            $moddeleteuserdata = $modname . '_delete_userdata';
            // Function to delete user data
            if (file_exists($modfile)) {
                @(include_once $modfile);
                if (function_exists($moddeleteuserdata)) {
                    $moddeleteuserdata($data, $showfeedback);
                }
            }
        }
    } else {
        error('No modules are installed!');
    }
    // Delete other stuff
    $context = get_context_instance(CONTEXT_COURSE, $data->courseid);
    if (!empty($data->reset_students) or !empty($data->reset_teachers)) {
        $teachers = array_keys(get_users_by_capability($context, 'moodle/course:update'));
        $participants = array_keys(get_users_by_capability($context, 'moodle/course:view'));
        $students = array_diff($participants, $teachers);
        if (!empty($data->reset_students)) {
            foreach ($students as $studentid) {
                role_unassign(0, $studentid, 0, $context->id);
            }
            if ($showfeedback) {
                notify($strdeleted . ' ' . get_string('students'), 'notifysuccess');
            }
            /// Delete group members (but keep the groups)
            $result = groups_delete_group_members($data->courseid, $showfeedback) && $result;
        }
        if (!empty($data->reset_teachers)) {
            foreach ($teachers as $teacherid) {
                role_unassign(0, $teacherid, 0, $context->id);
            }
            if ($showfeedback) {
                notify($strdeleted . ' ' . get_string('teachers'), 'notifysuccess');
            }
        }
    }
    if (!empty($data->reset_groups)) {
        $result = groups_delete_groupings($data->courseid, $showfeedback) && $result;
        $result = groups_delete_groups($data->courseid, $showfeedback) && $result;
    }
    if (!empty($data->reset_events)) {
        if (delete_records('event', 'courseid', $data->courseid)) {
            if ($showfeedback) {
                notify($strdeleted . ' event', 'notifysuccess');
            }
        } else {
            $result = false;
        }
    }
    if (!empty($data->reset_logs)) {
        if (delete_records('log', 'course', $data->courseid)) {
            if ($showfeedback) {
                notify($strdeleted . ' log', 'notifysuccess');
            }
        } else {
            $result = false;
        }
    }
    // deletes all role assignments, and local override,
    // these have no courseid in table and needs separate process
    delete_records('role_capabilities', 'contextid', $context->id);
    // force accessinfo refresh for users visiting this context...
    mark_context_dirty($context->path);
    return $result;
}

    /**
     * Test the group event handlers
     */
    public function test_group_event_handlers() {
        global $DB,$CFG;

        $this->resetAfterTest();

        $this->setAdminUser();

        // Setup course, user and groups

        $course = $this->getDataGenerator()->create_course();
        $user1 = $this->getDataGenerator()->create_user();
        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
        $this->assertNotEmpty($studentrole);
        $this->assertTrue(enrol_try_internal_enrol($course->id, $user1->id, $studentrole->id));
        $group1 = $this->getDataGenerator()->create_group(array('courseid'=>$course->id));
        $group2 = $this->getDataGenerator()->create_group(array('courseid'=>$course->id));
        $this->assertTrue(groups_add_member($group1, $user1));
        $this->assertTrue(groups_add_member($group2, $user1));

        $uniqueid = 0;

        $quiz_generator = $this->getDataGenerator()->get_plugin_generator('mod_quiz');

        $quiz = $quiz_generator->create_instance(array('course'=>$course->id, 'timeclose'=>1200, 'timelimit'=>0));

        // add a group1 override
        $DB->insert_record('quiz_overrides', array('quiz'=>$quiz->id, 'groupid'=>$group1->id, 'timeclose'=>1300, 'timelimit'=>null));

        // add an attempt
        $attemptid = $DB->insert_record('quiz_attempts', array('quiz'=>$quiz->id, 'userid'=>$user1->id, 'state'=>'inprogress', 'timestart'=>100, 'timecheckstate'=>0, 'layout'=>'', 'uniqueid'=>$uniqueid++));

        // update timecheckstate
        quiz_update_open_attempts(array('quizid'=>$quiz->id));
        $this->assertEquals(1300, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));

        // remove from group
        $this->assertTrue(groups_remove_member($group1, $user1));
        $this->assertEquals(1200, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));

        // add back to group
        $this->assertTrue(groups_add_member($group1, $user1));
        $this->assertEquals(1300, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));

        // delete group
        groups_delete_group($group1);
        $this->assertEquals(1200, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));
        $this->assertEquals(0, $DB->count_records('quiz_overrides', array('quiz'=>$quiz->id)));

        // add a group2 override
        $DB->insert_record('quiz_overrides', array('quiz'=>$quiz->id, 'groupid'=>$group2->id, 'timeclose'=>1400, 'timelimit'=>null));
        quiz_update_open_attempts(array('quizid'=>$quiz->id));
        $this->assertEquals(1400, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));

        // delete user1 from all groups
        groups_delete_group_members($course->id, $user1->id);
        $this->assertEquals(1200, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));

        // add back to group2
        $this->assertTrue(groups_add_member($group2, $user1));
        $this->assertEquals(1400, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));

        // delete everyone from all groups
        groups_delete_group_members($course->id);
        $this->assertEquals(1200, $DB->get_field('quiz_attempts', 'timecheckstate', array('id'=>$attemptid)));
    }

/**
 * Delete all groups from course
 * @param int $courseid
 * @param bool $showfeedback
 * @return bool success
 */
function groups_delete_groups($courseid, $showfeedback = false)
{
    global $CFG, $DB, $OUTPUT;
    require_once $CFG->libdir . '/gdlib.php';
    // delete any uses of groups
    groups_delete_groupings_groups($courseid, $showfeedback);
    groups_delete_group_members($courseid, 0, $showfeedback);
    // delete group pictures
    if ($groups = $DB->get_records('groups', array('courseid' => $courseid))) {
        foreach ($groups as $group) {
            delete_profile_image($group->id, 'groups');
        }
    }
    // delete group calendar events
    $groupssql = "SELECT id FROM {groups} g WHERE g.courseid = ?";
    $DB->delete_records_select('event', "groupid IN ({$groupssql})", array($courseid));
    $DB->delete_records('groups', array('courseid' => $courseid));
    //trigger groups events
    events_trigger('groups_groups_deleted', $courseid);
    if ($showfeedback) {
        echo $OUTPUT->notification(get_string('deleted') . ' groups');
    }
    return true;
}