File Source for groupmanager.lib.php

<?php
/*
==============================================================================
Dokeos - elearning and course management software
Copyright (c) 2004 Dokeos S.A.
Copyright (c) 2003 Ghent University (UGent)
Copyright (c) 2001 Universite catholique de Louvain (UCL)
For a full list of contributors, see "credits.txt".
The full license can be read in "license.txt".
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.
See the GNU General Public License for more details.
Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
Mail: info@dokeos.com
==============================================================================
*/
/**
==============================================================================
* This is the group library for Dokeos.
* Include/require it in your code to use its functionality.
*
* @author various authors
* @author Roan Embrechts (Vrije Universiteit Brussel), virtual courses support + some cleaning
* @author Bart Mollet (HoGent), all functions in class GroupManager
* @package dokeos.library
==============================================================================
*/
require_once ('database.lib.php');
require_once ('course.lib.php');
require_once ('tablesort.lib.php');
require_once ('fileManage.lib.php');
require_once ('fileUpload.lib.php');
/**
* infinite
*/
define("INFINITE", "99999");
/**
* No limit on the number of users in a group
*/
define("MEMBER_PER_GROUP_NO_LIMIT", "0");
/**
* No limit on the number of groups per user
*/
define("GROUP_PER_MEMBER_NO_LIMIT", "0");
/**
* The tools of a group can have 3 states
* - not available
* - public
* - private
*/
define("TOOL_NOT_AVAILABLE", "0");
define("TOOL_PUBLIC", "1");
define("TOOL_PRIVATE", "2");
/**
* Constants for the available group tools
*/
//define("GROUP_TOOL_FORUM", "0");
define("GROUP_TOOL_DOCUMENTS", "1");
define("GROUP_TOOL_CALENDAR","2");
define("GROUP_TOOL_ANNOUNCEMENT","3");
define("GROUP_TOOL_WORK","4");
/**
* Fixed id's for group categories
* - VIRTUAL_COURSE_CATEGORY: in this category groups are created based on the
* virtual course of a course
* - DEFAULT_GROUP_CATEGORY: When group categories aren't available (platform-
* setting), all groups are created in this 'dummy'-category
*/
define("VIRTUAL_COURSE_CATEGORY", 1);
define("DEFAULT_GROUP_CATEGORY", 2);
/**
* This library contains some functions for group-management.
* @author Bart Mollet
* @package dokeos.library
* @todo Add $course_code parameter to all functions. So this GroupManager can
* be used outside a session.
*/
class GroupManager
{
/*==============================================================================
* GROUP FUNCTIONS
==============================================================================*/
/**
* Get list of groups for current course.
* @param int $category The id of the category from which the groups are
* requested
* @param string $course_code Default is current course
* @return array An array with all information about the groups.
*/
function get_group_list($category = null, $course_code = null)
{
global $_user;
$course_db = '';
if ($course_code != null)
{
$course_info = Database :: get_course_info($course_code);
$course_db = $course_info['database'];
}
$table_group = Database :: get_course_table(TABLE_GROUP, $course_db);
$table_user = Database :: get_main_table(TABLE_MAIN_USER);
$table_course = Database :: get_main_table(TABLE_MAIN_COURSE);
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER, $course_db);
$sql = "SELECT g.id ,
g.name ,
g.description ,
g.category_id,
g.max_student maximum_number_of_members,
g.secret_directory,
g.self_registration_allowed,
g.self_unregistration_allowed,
ug.user_id is_member,
COUNT(ug2.id) number_of_members
FROM ".$table_group." `g`
LEFT JOIN ".$table_group_user." `ug`
ON `ug`.`group_id` = `g`.`id` AND `ug`.`user_id` = '".$_user['user_id']."'
LEFT JOIN ".$table_group_user." `ug2`
ON `ug2`.`group_id` = `g`.`id`";
if ($category != null)
$sql .= " WHERE `g`.`category_id` = '".$category."' ";
$sql .= " GROUP BY `g`.`id` ORDER BY UPPER(g.name)";
$groupList = api_sql_query($sql,__FILE__,__LINE__);
$groups = array ();
while ($thisGroup = mysql_fetch_array($groupList))
{
if ($thisGroup['category_id'] == VIRTUAL_COURSE_CATEGORY)
{
$sql = "SELECT title FROM $table_course WHERE code = '".$thisGroup['name']."'";
$obj = mysql_fetch_object(api_sql_query($sql,__FILE__,__LINE__));
$thisGroup['name'] = $obj->title;
}
$groups[] = $thisGroup;
}
return $groups;
}
/**
* Create a group
* @param string $name The name for this group
* @param int $tutor The user-id of the group's tutor
* @param int $places How many people can subscribe to the new group
*/
function create_group($name, $category_id, $tutor, $places)
{
global $_course,$_user;
$currentCourseRepository = $_course['path'];
$table_group = Database :: get_course_table(TABLE_GROUP);
$table_forum = Database :: get_course_table(TABLE_FORUM);
$category = GroupManager :: get_category($category_id);
if (intval($places) == 0) //if the amount of users per group is not filled in, use the setting from the category
{
$places = $category['max_student'];
}
$sql = "INSERT INTO ".$table_group." SET category_id='".$category_id."', max_student = '".$places."', doc_state = '".$category['doc_state']."', calendar_state = '".$category['calendar_state']."', work_state = '".$category['work_state']."', announcements_state = '".$category['announcements_state']."', self_registration_allowed = '".$category['self_reg_allowed']."', self_unregistration_allowed = '".$category['self_unreg_allowed']."'";
api_sql_query($sql,__FILE__,__LINE__);
$lastId = mysql_insert_id();
/*$secret_directory = uniqid("")."_team_".$lastId;
while (is_dir(api_get_path(SYS_COURSE_PATH).$currentCourseRepository."/group/$secret_directory"))
{
$secret_directory = uniqid("")."_team_".$lastId;
}
FileManager :: mkdirs(api_get_path(SYS_COURSE_PATH).$currentCourseRepository."/group/".$secret_directory, 0770);
*/
$desired_dir_name= '/'.replace_dangerous_char($name,'strict').'_groupdocs';
$dir_name = create_unexisting_directory($_course,$_user['user_id'],$lastId,NULL,api_get_path(SYS_COURSE_PATH).$currentCourseRepository.'/document',$desired_dir_name);
/* Stores the directory path into the group table */
$sql = "UPDATE ".$table_group." SET name = '".mysql_real_escape_string($name)."', secret_directory = '".$dir_name."' WHERE id ='".$lastId."'";
api_sql_query($sql,__FILE__,__LINE__);
// create a forum if needed
if ($category['forum_state'] > 0)
{
include_once(api_get_path(SYS_CODE_PATH).'forum/forumconfig.inc.php');
include_once(api_get_path(SYS_CODE_PATH).'forum/forumfunction.inc.php');
$forum_categories = get_forum_categories();
$values['forum_title'] = get_lang('ForumOfGroup').' '.$name;
$counter = 0;
foreach ($forum_categories as $key=>$value)
{
if ($counter==0)
{
$forum_category_id = $key;
}
$counter++;
}
$values['forum_category'] = $forum_category_id;
$values['allow_anonymous_group']['allow_anonymous'] = 0;
$values['students_can_edit_group']['students_can_edit'] = 0;
$values['approval_direct_group']['approval_direct'] = 0;
$values['allow_attachments_group']['allow_attachments'] = 1;
$values['allow_new_threads_group']['allow_new_threads'] = 1;
$values['default_view_type_group']['default_view_type']=api_get_setting('default_forum_view');
$values['group_forum'] = $lastId;
if ($category['forum_state'] == '1')
{
$values['public_private_group_forum_group']['public_private_group_forum']='public';
}
else
{
$values['public_private_group_forum_group']['public_private_group_forum']='private';
}
store_forum($values);
}
return $lastId;
}
/**
* Create subgroups.
* This function creates new groups based on an existing group. It will
* create the specified number of groups and fill those groups with users
* from the base group
* @param int $group_id The group from which subgroups have to be created.
* @param int $number_of_groups The number of groups that have to be created
*/
function create_subgroups($group_id, $number_of_groups)
{
$table_group = Database :: get_course_table(TABLE_GROUP);
$category_id = GroupManager :: create_category('Subgroups', '', TOOL_PRIVATE, TOOL_PRIVATE, 0, 0, 1, 1);
$users = GroupManager :: get_users($group_id);
$group_ids = array ();
for ($group_nr = 1; $group_nr <= $number_of_groups; $group_nr ++)
{
$group_ids[] = GroupManager :: create_group('SUBGROUP '.$group_nr, $category_id, 0, 0);
}
$members = array ();
foreach ($users as $index => $user_id)
{
GroupManager :: subscribe_users($user_id, $group_ids[$index % $number_of_groups]);
$members[$group_ids[$index % $number_of_groups]]++;
}
foreach ($members as $group_id => $places)
{
$sql = "UPDATE $table_group SET max_student = $places WHERE id = $group_id";
api_sql_query($sql,__FILE__,__LINE__);
}
}
/**
* Create groups from all virtual courses in the given course.
*/
function create_groups_from_virtual_courses()
{
GroupManager :: delete_category(VIRTUAL_COURSE_CATEGORY);
$id = GroupManager :: create_category(get_lang('GroupsFromVirtualCourses'), '', TOOL_NOT_AVAILABLE, TOOL_NOT_AVAILABLE, 0, 0, 1, 1);
$table_group_cat = Database :: get_course_table(TABLE_GROUP_CATEGORY);
$sql = "UPDATE ".$table_group_cat." SET id=".VIRTUAL_COURSE_CATEGORY." WHERE id=$id";
api_sql_query($sql,__FILE__,__LINE__);
$course = api_get_course_info();
$course['code'] = $course['sysCode'];
$course['title'] = $course['name'];
$virtual_courses = CourseManager :: get_virtual_courses_linked_to_real_course($course['sysCode']);
$group_courses = $virtual_courses;
$group_courses[] = $course;
$ids = array ();
foreach ($group_courses as $index => $group_course)
{
$users = CourseManager :: get_user_list_from_course_code($group_course['code']);
$members = array ();
foreach ($users as $index => $user)
{
if ($user['status'] == 5 && $user['tutor_id'] == 0)
{
$members[] = $user['user_id'];
}
}
$id = GroupManager :: create_group($group_course['code'], VIRTUAL_COURSE_CATEGORY, 0, count($members));
GroupManager :: subscribe_users($members, $id);
$ids[] = $id;
}
return $ids;
}
/**
* Create a group for every class subscribed to the current course
* @param int $category_id The category in which the groups should be
* created
*/
function create_class_groups($category_id)
{
global $_course;
$classes = ClassManager::get_classes_in_course($_course['sysCode']);
$group_ids = array();
foreach($classes as $index => $class)
{
$users = ClassManager::get_users($class['id']);
$group_id = GroupManager::create_group($class['name'],$category_id,0,count($users));
$user_ids = array();
foreach($users as $index_user => $user)
{
$user_ids[] = $user['user_id'];
}
GroupManager::subscribe_users($user_ids,$group_id);
$group_ids[] = $group_id;
}
return $group_ids;
}
/**
* deletes groups and their data.
* @author Christophe Gesche <christophe.gesche@claroline.net>
* @author Hugues Peeters <hugues.peeters@claroline.net>
* @author Bart Mollet
* @param mixed $groupIdList - group(s) to delete. It can be a single id
* (int) or a list of id (array).
* @param string $course_code Default is current course
* @return integer - number of groups deleted.
*/
function delete_groups($group_ids, $course_code = null)
{
$course_db = '';
if ($course_code != null)
{
$course = Database :: get_course_info($course_code);
$course['path'] = $course['directory'];
$course_db = $course['database'];
}
else
{
$course = api_get_course_info();
}
// Database table definitions
$group_table = Database :: get_course_table(TABLE_GROUP, $course_db);
$group_user_table = Database :: get_course_table(TABLE_GROUP_USER, $course_db);
$forum_table = Database :: get_course_table(TABLE_FORUM, $course_db);
$forum_post_table = Database :: get_course_table(TABLE_FORUM_POST, $course_db);
$forum_post_text_table = Database :: get_course_table(TOOL_FORUM_POST_TEXT_TABLE, $course_db);
$forum_topic_table = Database :: get_course_table(TABLE_FORUM_POST, $course_db);
$group_ids = is_array($group_ids) ? $group_ids : array ($group_ids);
// define repository for deleted element
$group_garbage = api_get_path(GARBAGE_PATH).$course['path']."/group/";
$perm = api_get_setting('permissions_for_new_directories');
$perm = (!empty($perm)?$perm:'0770');
if (!file_exists($group_garbage))
FileManager :: mkdirs($group_garbage, $perm);
// Unsubscribe all users
GroupManager :: unsubscribe_all_users($group_ids);
$sql = 'SELECT id, secret_directory FROM '.$group_table.' WHERE id IN ('.implode(' , ', $group_ids).')';
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$forum_ids = array ();
while ($group = mysql_fetch_object($db_result))
{
// move group-documents to garbage
$source_directory = api_get_path(SYS_COURSE_PATH).$course['path']."/group/".$group->secret_directory;
$destination_directory = $group_garbage.$group->secret_directory;
if (file_exists($source_directory))
{
rename($source_directory, $destination_directory);
}
//$forum_ids[] = $group->forum_id;
}
// delete the groups
$sql = "DELETE FROM ".$group_table." WHERE id IN ('".implode("' , '", $group_ids)."')";
api_sql_query($sql,__FILE__,__LINE__);
return mysql_affected_rows();
}
/**
* Get group properties
* @param int $group_id The group from which properties are requested.
* @return array All properties. Array-keys are name, tutor_id, description, maximum_number_of_students, directory
*/
function get_group_properties($group_id)
{
if (empty($group_id) or !is_integer(intval($group_id)) ) {
return null;
}
$table_group = Database :: get_course_table(TABLE_GROUP);
$sql = 'SELECT * FROM '.$table_group.' WHERE id = '.$group_id;
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$db_object = mysql_fetch_object($db_result);
$result['id'] = $db_object->id;
$result['name'] = $db_object->name;
$result['tutor_id'] = $db_object->tutor_id;
$result['description'] = $db_object->description;
$result['maximum_number_of_students'] = $db_object->max_student;
$result['doc_state'] = $db_object->doc_state;
$result['work_state'] = $db_object->work_state;
$result['calendar_state'] = $db_object->calendar_state;
$result['announcements_state'] = $db_object->announcements_state;
$result['directory'] = $db_object->secret_directory;
$result['self_registration_allowed'] = $db_object->self_registration_allowed;
$result['self_unregistration_allowed'] = $db_object->self_unregistration_allowed;
return $result;
}
/**
* Set group properties
* Changes the group's properties.
* @param int $group_id
* @param string $name
* @param string $description
* @param int $tutor_id
* @param int $maximum_number_of_students
* @param bool $self_registration_allowed
* @param bool $self_unregistration_allowed
* @return bool TRUE if properties are successfully changed.
*/
function set_group_properties($group_id, $name, $description, $maximum_number_of_students, $doc_state, $work_state, $calendar_state, $announcements_state, $self_registration_allowed, $self_unregistration_allowed)
{
$table_group = Database :: get_course_table(TABLE_GROUP);
//$table_forum = Database :: get_course_table(TABLE_FORUM);
$sql = "UPDATE ".$table_group."
SET name='".trim($name)."',
doc_state = '".$doc_state."',
work_state = '".$work_state."',
calendar_state = '".$calendar_state."',
announcements_state = '".$announcements_state."',
description='".trim($description)."',
max_student=".$maximum_number_of_students.",
self_registration_allowed='".$self_registration_allowed."',
self_unregistration_allowed='".$self_unregistration_allowed."'
WHERE id=".$group_id;
$result = api_sql_query($sql,__FILE__,__LINE__);
//$sql = "UPDATE ".$table_forum." SET forum_name='".trim($name)."' WHERE forum_id=".$forum_id;
//$result &= api_sql_query($sql,__FILE__,__LINE__);
return $result;
}
/**
* Get the total number of groups for the current course.
* @return int The number of groups for the current course.
*/
function get_number_of_groups()
{
$table_group = Database :: get_course_table(TABLE_GROUP);
$res = api_sql_query('SELECT COUNT(id) AS number_of_groups FROM '.$table_group);
$obj = mysql_fetch_object($res);
return $obj->number_of_groups;
}
/*==============================================================================
* GROUPCATEGORY FUNCTIONS
==============================================================================*/
/**
* Get all categories
* @param string $course_code The cours (default = current course)
*/
function get_categories($course_code = null)
{
$course_db = '';
if ($course_code != null)
{
$course_info = Database :: get_course_info($course_code);
$course_db = $course_info['database'];
}
$table_group_cat = Database :: get_course_table(TABLE_GROUP_CATEGORY, $course_db);
$sql = "SELECT * FROM $table_group_cat ORDER BY display_order";
$res = api_sql_query($sql,__FILE__,__LINE__);
$cats = array ();
while ($cat = mysql_fetch_array($res))
{
$cats[] = $cat;
}
return $cats;
}
/**
* Get a group category
* @param int $id The category id
* @param string $course_code The course (default = current course)
*/
function get_category($id, $course_code = null)
{
$course_db = '';
if ($course_code != null)
{
$course_info = Database :: get_course_info($course_code);
$course_db = $course_info['database'];
}
$table_group_cat = Database :: get_course_table(TABLE_GROUP_CATEGORY, $course_db);
$sql = "SELECT * FROM $table_group_cat WHERE id = $id";
$res = api_sql_query($sql,__FILE__,__LINE__);
return mysql_fetch_array($res);
}
/**
* Get the category of a given group
* @param int $group_id The id of the group
* @param string $course_code The course in which the group is (default =
* current course)
* @return array The category
*/
function get_category_from_group($group_id, $course_code = null)
{
$course_db = '';
if ($course_code != null)
{
$course_info = Database :: get_course_info($course_code);
$course_db = $course_info['database'];
}
$table_group = Database :: get_course_table(TABLE_GROUP, $course_db);
$table_group_cat = Database :: get_course_table(TABLE_GROUP_CATEGORY, $course_db);
$sql = "SELECT gc.* FROM $table_group_cat gc, $table_group g WHERE gc.id = g.category_id AND g.id=$group_id";
$res = api_sql_query($sql,__FILE__,__LINE__);
$cat = mysql_fetch_array($res);
return $cat;
}
/**
* Delete a group category
* @param int $cat_id The id of the category to delete
* @param string $course_code The code in which the category should be
* deleted (default = current course)
*/
function delete_category($cat_id, $course_code = null)
{
$course_db = '';
if ($course_code != null)
{
$course_info = Database :: get_course_info($course_code);
$course_db = $course_info['database'];
}
$table_group = Database :: get_course_table(TABLE_GROUP, $course_db);
$table_group_cat = Database :: get_course_table(TABLE_GROUP_CATEGORY, $course_db);
$sql = "SELECT id FROM $table_group WHERE category_id='".$cat_id."'";
$res = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($res) > 0)
{
$groups_to_delete = array ();
while ($group = mysql_fetch_object($res))
{
$groups_to_delete[] = $group->id;
}
GroupManager :: delete_groups($groups_to_delete);
}
$sql = "DELETE FROM $table_group_cat WHERE id='".$cat_id."'";
api_sql_query($sql,__FILE__,__LINE__);
}
/**
* Create group category
* @param string $title The title of the new category
* @param string $description The description of the new category
* @param bool $self_registration_allowed
* @param bool $self_unregistration_allowed
* @param int $max_number_of_students
* @param int $groups_per_user
*/
function create_category($title, $description, $doc_state, $work_state, $calendar_state, $announcements_state, $forum_state, $self_registration_allowed, $self_unregistration_allowed, $maximum_number_of_students, $groups_per_user)
{
$table_group_category = Database :: get_course_table(TABLE_GROUP_CATEGORY);
$sql = "SELECT MAX(display_order)+1 as new_order FROM $table_group_category ";
$res = api_sql_query($sql,__FILE__,__LINE__);
$obj = mysql_fetch_object($res);
if (!isset ($obj->new_order))
{
$obj->new_order = 1;
}
$sql = "INSERT INTO ".$table_group_category."
SET title='".mysql_real_escape_string($title)."',
display_order = $obj->new_order,
description='".mysql_real_escape_string($description)."',
doc_state = '".$doc_state."',
work_state = '".$work_state."',
calendar_state = '".$calendar_state."',
announcements_state = '".$announcements_state."',
forum_state = '".Database::escape_string($forum_state)."',
groups_per_user = ".$groups_per_user.",
self_reg_allowed = '".$self_registration_allowed."',
self_unreg_allowed = '".$self_unregistration_allowed."',
max_student = ".$maximum_number_of_students." ";
api_sql_query($sql,__FILE__,__LINE__);
$id = mysql_insert_id();
if ($id == VIRTUAL_COURSE_CATEGORY)
{
$sql = "UPDATE ".$table_group_category." SET id = ". ($id +1)." WHERE id = $id";
api_sql_query($sql,__FILE__,__LINE__);
return $id +1;
}
return $id;
}
/**
* Update group category
* @param int $id The id of the category
* @param string $title The title of the new category
* @param string $description The description of the new category
* @param bool $self_registration_allowed
* @param bool $self_unregistration_allowed
* @param int $max_number_of_students
* @param int $groups_per_user
*/
function update_category($id, $title, $description, $doc_state, $work_state, $calendar_state, $announcements_state, $forum_state, $self_registration_allowed, $self_unregistration_allowed, $maximum_number_of_students, $groups_per_user)
{
$table_group_category = Database :: get_course_table(TABLE_GROUP_CATEGORY);
$sql = "UPDATE ".$table_group_category."
SET title='".mysql_real_escape_string($title)."',
description='".mysql_real_escape_string($description)."',
doc_state = '".$doc_state."',
work_state = '".$work_state."',
calendar_state = '".$calendar_state."',
announcements_state = '".$announcements_state."',
forum_state = '".Database::escape_string($forum_state)."',
groups_per_user = ".$groups_per_user.",
self_reg_allowed = '".$self_registration_allowed."',
self_unreg_allowed = '".$self_unregistration_allowed."',
max_student = ".$maximum_number_of_students."
WHERE id=$id";
api_sql_query($sql,__FILE__,__LINE__);
}
/**
* Returns the number of groups of the user with the greatest number of
* subscribtions in the given category
*/
function get_current_max_groups_per_user($category_id = null, $course_code = null)
{
$course_db = '';
if ($course_code != null)
{
$course_info = Database :: get_course_info($course_code);
$course_db = $course_info['database'];
}
$group_table = Database :: get_course_table(TABLE_GROUP, $course_db);
$group_user_table = Database :: get_course_table(TABLE_GROUP_USER, $course_db);
$sql = 'SELECT COUNT(gu.group_id) AS current_max FROM '.$group_user_table.' gu, '.$group_table.' g WHERE gu.group_id = g.id ';
if ($category_id != null)
$sql .= ' AND g.category_id = '.$category_id;
$sql .= ' GROUP BY gu.user_id ORDER BY current_max DESC LIMIT 1';
$res = api_sql_query($sql,__FILE__,__LINE__);
$obj = mysql_fetch_object($res);
return $obj->current_max;
}
/**
* Swaps the display-order of two categories
* @param int $id1 The id of the first category
* @param int $id2 The id of the second category
*/
function swap_category_order($id1, $id2)
{
$table_group_cat = Database :: get_course_table(TABLE_GROUP_CATEGORY);
$sql = "SELECT id,display_order FROM $table_group_cat WHERE id IN ($id1,$id2)";
$res = api_sql_query($sql,__FILE__,__LINE__);
$cat1 = mysql_fetch_object($res);
$cat2 = mysql_fetch_object($res);
$sql = "UPDATE $table_group_cat SET display_order=$cat2->display_order WHERE id=$cat1->id";
api_sql_query($sql,__FILE__,__LINE__);
$sql = "UPDATE $table_group_cat SET display_order=$cat1->display_order WHERE id=$cat2->id";
api_sql_query($sql,__FILE__,__LINE__);
}
/*==============================================================================
* GROUP USERS FUNCTIONS
==============================================================================*/
/**
* Get all users from a given group
* @param int $group_id The group
*/
function get_users($group_id)
{
$group_user_table = Database :: get_course_table(TABLE_GROUP_USER, $course_db);
$sql = "SELECT user_id FROM $group_user_table WHERE group_id = $group_id";
$res = api_sql_query($sql,__FILE__,__LINE__);
$users = array ();
while ($obj = mysql_fetch_object($res))
{
$users[] = $obj->user_id;
}
return $users;
}
/**
* Fill the groups with students.
* The algorithm takes care to first fill the groups with the least # of users.
* Analysis
* There was a problem with the "ALL" setting.
* When max # of groups is set to all, the value is sometimes NULL and sometimes ALL
* and in both cased the query does not work as expected.
* Stupid solution (currently implemented: set ALL to a big number (INFINITE) and things are solved :)
* Better solution: that's up to you.
*
* Note
* Throughout Dokeos there is some confusion about "course id" and "course code"
* The code is e.g. TEST101, but sometimes a variable that is called courseID also contains a course code string.
* However, there is also a integer course_id that uniquely identifies the course.
* ywarnier:> Now the course_id has been removed (25/1/2005)
* The databases are als very inconsistent in this.
*
* @author Chrisptophe Gesche <christophe.geshe@claroline.net>,
* Hugues Peeters <hugues.peeters@claroline.net> - original version
* @author Roan Embrechts - virtual course support, code cleaning
* @author Bart Mollet - code cleaning, use other GroupManager-functions
* @return void
*/
function fill_groups($group_ids)
{
$group_ids = is_array($group_ids) ? $group_ids : array ($group_ids);
global $_course;
$category = GroupManager :: get_category_from_group($group_ids[0]);
$groups_per_user = $category['groups_per_user'];
$course_user_table = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
$group_table = Database :: get_course_table(TABLE_GROUP);
$group_user_table = Database :: get_course_table(TABLE_GROUP_USER);
$complete_user_list = CourseManager :: get_real_and_linked_user_list($_course['sysCode']);
$number_groups_per_user = ($groups_per_user == GROUP_PER_MEMBER_NO_LIMIT ? INFINITE : $groups_per_user);
/*
* Retrieve all the groups where enrollment is still allowed
* (reverse) ordered by the number of place available
*/
$sql = "SELECT g.id gid, g.max_student-count(ug.user_id) nbPlaces, g.max_student
FROM ".$group_table." g
LEFT JOIN ".$group_user_table." ug
ON `g`.`id` = `ug`.`group_id`
WHERE g.id IN (".implode(',', $group_ids).")
GROUP BY (`g`.`id`)
HAVING (nbPlaces > 0 OR g.max_student = ".MEMBER_PER_GROUP_NO_LIMIT.")
ORDER BY nbPlaces DESC";
$sql_result = api_sql_query($sql,__FILE__,__LINE__);
$group_available_place = array ();
while ($group = Database::fetch_array($sql_result, 'ASSOC'))
{
$group_available_place[$group['gid']] = $group['nbPlaces'];
}
/*
* Retrieve course users (reverse) ordered by the number
* of group they are already enrolled
*/
for ($i = 0; $i < count($complete_user_list); $i ++)
{
//find # of groups the user is enrolled in
$number_of_groups = GroupManager :: user_in_number_of_groups($complete_user_list[$i]["user_id"],$category['id']);
//add # of groups to user list
$complete_user_list[$i]['number_groups_left'] = $number_groups_per_user - $number_of_groups;
}
//first sort by user_id to filter out duplicates
$complete_user_list = TableSort :: sort_table($complete_user_list, 'user_id');
$complete_user_list = GroupManager :: filter_duplicates($complete_user_list, "user_id");
$complete_user_list = GroupManager :: filter_only_students($complete_user_list);
//now sort by # of group left
$complete_user_list = TableSort :: sort_table($complete_user_list, 'number_groups_left', SORT_DESC);
$userToken = array ();
foreach ($complete_user_list as $this_user)
{
if ($this_user['number_groups_left'] > 0)
{
$userToken[$this_user['user_id']] = $this_user['number_groups_left'];
}
}
/*
* Retrieve the present state of the users repartion in groups
*/
$sql = "SELECT user_id uid, group_id gid FROM ".$group_user_table;
$result = api_sql_query($sql,__FILE__,__LINE__);
while ($member = Database::fetch_array($result, 'ASSOC'))
{
$groupUser[$member['gid']][] = $member['uid'];
}
$changed = true;
while ($changed)
{
$changed = false;
reset($group_available_place);
arsort($group_available_place);
reset($userToken);
arsort($userToken);
foreach ($group_available_place as $group_id => $place)
{
foreach ($userToken as $user_id => $places)
{
if (GroupManager :: can_user_subscribe($user_id, $group_id))
{
GroupManager :: subscribe_users($user_id, $group_id);
$group_available_place[$group_id]--;
$userToken[$user_id]--;
$changed = true;
break;
}
}
if ($changed)
{
break;
}
}
}
}
/**
* Get the number of students in a group.
* @param int $group_id
* @return int Number of students in the given group.
*/
function number_of_students($group_id)
{
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$db_result = api_sql_query('SELECT COUNT(*) AS number_of_students FROM '.$table_group_user.' WHERE group_id = '.$group_id);
$db_object = mysql_fetch_object($db_result);
return $db_object->number_of_students;
}
/**
* Maximum number of students in a group
* @param int $group_id
* @return int Maximum number of students in the given group.
*/
function maximum_number_of_students($group_id)
{
$table_group = Database :: get_course_table(TABLE_GROUP);
$db_result = api_sql_query('SELECT max_student FROM '.$table_group.' WHERE id = '.$group_id);
$db_object = mysql_fetch_object($db_result);
if ($db_object->max_student == 0)
{
return INFINITE;
}
return $db_object->max_student;
}
/**
* Number of groups of a user
* @param int $user_id
* @return int The number of groups the user is subscribed in.
*/
function user_in_number_of_groups($user_id, $cat_id)
{
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$table_group = Database :: get_course_table(TABLE_GROUP);
$sql = 'SELECT COUNT(*) AS number_of_groups FROM '.$table_group_user.' gu, '.$table_group.' g WHERE gu.user_id = \''.$user_id.'\' AND g.id = gu.group_id AND g.category_id= \''.$cat_id.'\'';
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$db_object = mysql_fetch_object($db_result);
return $db_object->number_of_groups;
}
/**
* Is sef-registration allowed?
* @param int $user_id
* @param int $group_id
* @return bool TRUE if self-registration is allowed in the given group.
*/
function is_self_registration_allowed($user_id, $group_id)
{
if (!$user_id > 0)
return false;
$table_group = Database :: get_course_table(TABLE_GROUP);
$sql = 'SELECT self_registration_allowed FROM '.$table_group.' WHERE id = '.$group_id;
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$db_object = mysql_fetch_object($db_result);
return $db_object->self_registration_allowed == 1 && GroupManager :: can_user_subscribe($user_id, $group_id);
}
/**
* Is sef-unregistration allowed?
* @param int $user_id
* @param int $group_id
* @return bool TRUE if self-unregistration is allowed in the given group.
*/
function is_self_unregistration_allowed($user_id, $group_id)
{
if (!$user_id > 0)
return false;
$table_group = Database :: get_course_table(TABLE_GROUP);
$db_result = api_sql_query('SELECT self_unregistration_allowed FROM '.$table_group.' WHERE id = '.$group_id);
$db_object = mysql_fetch_object($db_result);
return $db_object->self_unregistration_allowed == 1 && GroupManager :: can_user_unsubscribe($user_id, $group_id);
}
/**
* Is user subscribed in group?
* @param int $user_id
* @param int $group_id
* @return bool TRUE if given user is subscribed in given group
*/
function is_subscribed($user_id, $group_id)
{
if(empty($user_id) or empty($group_id)){return false;}
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$sql = 'SELECT 1 FROM '.$table_group_user.' WHERE group_id = '.$group_id.' AND user_id = '.$user_id;
$db_result = api_sql_query($sql);
return Database::num_rows($db_result) > 0;
}
/**
* Can a user subscribe to a specified group in a course
* @param int $user_id
* @param int $group_id
* @return bool TRUE if given user can be subscribed in given group
*/
function can_user_subscribe($user_id, $group_id)
{
global $_course;
$course_code = $_course['sysCode'];
$category = GroupManager :: get_category_from_group($group_id);
$result = CourseManager :: is_user_subscribed_in_real_or_linked_course($user_id, $course_code);
$result = !GroupManager :: is_subscribed($user_id, $group_id);
$result &= (GroupManager :: number_of_students($group_id) < GroupManager :: maximum_number_of_students($group_id));
if ($category['groups_per_user'] == GROUP_PER_MEMBER_NO_LIMIT)
{
$category['groups_per_user'] = INFINITE;
}
$result &= (GroupManager :: user_in_number_of_groups($user_id, $category['id']) < $category['groups_per_user']);
$result &= !GroupManager :: is_tutor($user_id);
return $result;
}
/**
* Can a user unsubscribe to a specified group in a course
* @param int $user_id
* @param int $group_id
* @return bool TRUE if given user can be unsubscribed from given group
* @internal for now, same as GroupManager::is_subscribed($user_id,$group_id)
*/
function can_user_unsubscribe($user_id, $group_id)
{
$result = GroupManager :: is_subscribed($user_id, $group_id);
return $result;
}
/**
* Get all subscribed users from a group
* @param int $group_id
* @return array An array with information of all users from the given group.
* (user_id, firstname, lastname, email)
*/
function get_subscribed_users($group_id)
{
$table_user = Database :: get_main_table(TABLE_MAIN_USER);
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$sql = "SELECT `ug`.`id`, `u`.`user_id`, `u`.`lastname`, `u`.`firstname`, `u`.`email`
FROM ".$table_user." u, ".$table_group_user." ug
WHERE `ug`.`group_id`='".$group_id."'
AND `ug`.`user_id`=`u`.`user_id`
ORDER BY UPPER(`u`.`lastname`), UPPER(`u`.`firstname`)";
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$users = array ();
while ($user = mysql_fetch_object($db_result))
{
$member['user_id'] = $user->user_id;
$member['firstname'] = $user->firstname;
$member['lastname'] = $user->lastname;
$member['email'] = $user->email;
$users[] = $member;
}
return $users;
}
/**
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* Get all subscribed tutors of a group
* @param int $group_id
* @return array An array with information of all users from the given group.
* (user_id, firstname, lastname, email)
*/
function get_subscribed_tutors($group_id,$id_only=false)
{
$table_user = Database :: get_main_table(TABLE_MAIN_USER);
$table_group_tutor = Database :: get_course_table(TABLE_GROUP_TUTOR);
$sql = "SELECT `tg`.`id`, `u`.`user_id`, `u`.`lastname`, `u`.`firstname`, `u`.`email`
FROM ".$table_user." u, ".$table_group_tutor." tg
WHERE `tg`.`group_id`='".$group_id."'
AND `tg`.`user_id`=`u`.`user_id`
ORDER BY UPPER(`u`.`lastname`), UPPER(`u`.`firstname`)";
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$users = array ();
while ($user = mysql_fetch_object($db_result))
{
if ($id_only==false)
{
$member['user_id'] = $user->user_id;
$member['firstname'] = $user->firstname;
$member['lastname'] = $user->lastname;
$member['email'] = $user->email;
$users[] = $member;
}
else
{
$users[]=$user->user_id;
}
}
return $users;
}
/**
* Subscribe user(s) to a specified group in current course
* @param mixed $user_ids Can be an array with user-id's or a single user-id
* @param int $group_id
* @return bool TRUE if successfull
*/
function subscribe_users($user_ids, $group_id)
{
$user_ids = is_array($user_ids) ? $user_ids : array ($user_ids);
$result = true;
foreach ($user_ids as $index => $user_id)
{
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$sql = "INSERT INTO ".$table_group_user." (user_id, group_id) VALUES ('".$user_id."', '".$group_id."')";
$result &= api_sql_query($sql,__FILE__,__LINE__);
}
return $result;
}
/**
* Subscribe tutor(s) to a specified group in current course
* @param mixed $user_ids Can be an array with user-id's or a single user-id
* @param int $group_id
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
* @see subscribe_users. This function is almost an exact copy of that function.
* @return bool TRUE if successfull
*/
function subscribe_tutors($user_ids, $group_id)
{
$user_ids = is_array($user_ids) ? $user_ids : array ($user_ids);
$result = true;
foreach ($user_ids as $index => $user_id)
{
$table_group_tutor = Database :: get_course_table(TABLE_GROUP_TUTOR);
$sql = "INSERT INTO ".$table_group_tutor." (user_id, group_id) VALUES ('".$user_id."', '".$group_id."')";
$result &= api_sql_query($sql,__FILE__,__LINE__);
}
return $result;
}
/**
* Unsubscribe user(s) from a specified group in current course
* @param mixed $user_ids Can be an array with user-id's or a single user-id
* @param int $group_id
* @return bool TRUE if successfull
*/
function unsubscribe_users($user_ids, $group_id)
{
$user_ids = is_array($user_ids) ? $user_ids : array ($user_ids);
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$result &= api_sql_query('DELETE FROM '.$table_group_user.' WHERE group_id = '.$group_id.' AND user_id IN ('.implode(',', $user_ids).')');
}
/**
* Unsubscribe all users from one or more groups
* @param mixed $group_id Can be an array with group-id's or a single group-id
* @return bool TRUE if successfull
*/
function unsubscribe_all_users($group_ids)
{
$group_ids = is_array($group_ids) ? $group_ids : array ($group_ids);
if( count($group_ids) > 0)
{
$table_group_user = Database :: get_course_table(TABLE_GROUP_USER);
$sql = 'DELETE FROM '.$table_group_user.' WHERE group_id IN ('.implode(',', $group_ids).')';
$result = api_sql_query($sql,__FILE__,__LINE__);
return $result;
}
return true;
}
/**
* Unsubscribe all tutors from one or more groups
* @param mixed $group_id Can be an array with group-id's or a single group-id
* @see unsubscribe_all_users. This function is almost an exact copy of that function.
* @return bool TRUE if successfull
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function unsubscribe_all_tutors($group_ids)
{
$group_ids = is_array($group_ids) ? $group_ids : array ($group_ids);
if( count($group_ids) > 0)
{
$table_group_tutor = Database :: get_course_table(TABLE_GROUP_TUTOR);
$sql = 'DELETE FROM '.$table_group_tutor.' WHERE group_id IN ('.implode(',', $group_ids).')';
$result = api_sql_query($sql,__FILE__,__LINE__);
return $result;
}
return true;
}
/**
* Is the user a tutor of this group?
* @param $user_id the id of the user
* @param $group_id the id of the group
* @return boolean true/false
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function is_tutor_of_group($user_id,$group_id)
{
global $_course;
$table_group_tutor = Database :: get_course_table(TABLE_GROUP_TUTOR);
$sql = "SELECT * FROM ".$table_group_tutor." WHERE user_id='".$user_id."' AND group_id='".$group_id."'";
$result = api_sql_query($sql,__FILE__,__LINE__);
if (mysql_num_rows($result)>0)
{
return true;
}
else
{
return false;
}
}
/**
* Is the user part of this group? This can be a tutor or a normal member
* you should use this function if the access to a tool or functionality is restricted to the people who are actually in the group
* before you had to check if the user was 1. a member of the group OR 2. a tutor of the group. This function combines both
* @param $user_id the id of the user
* @param $group_id the id of the group
* @return boolean true/false
* @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
*/
function is_user_in_group($user_id, $group_id)
{
$member = GroupManager :: is_subscribed($user_id,$group_id);
$tutor = GroupManager :: is_tutor_of_group($user_id,$group_id);
if ($member OR $tutor)
{
return true;
}
else
{
return false;
}
}
/**
* Get all tutors for the current course.
* @return array An array with firstname, lastname and user_id for all
* tutors in the current course.
* @deprecated this function uses the old tutor implementation
*/
function get_all_tutors()
{
global $_course;
$course_user_table = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
$user_table = Database :: get_main_table(TABLE_MAIN_USER);
$sql = "SELECT user.user_id AS user_id, user.lastname AS lastname, user.firstname AS firstname
FROM ".$user_table." user, ".$course_user_table." cu
WHERE cu.user_id=user.user_id
AND cu.tutor_id='1'
AND cu.course_code='".$_course['sysCode']."'";
$resultTutor = api_sql_query($sql,__FILE__,__LINE__);
$tutors = array ();
while ($tutor = mysql_fetch_array($resultTutor))
{
$tutors[] = $tutor;
}
return $tutors;
}
/**
* Is user a tutor in current course
* @param int $user_id
* @return bool TRUE if given user is a tutor in the current course.
* @deprecated this function uses the old tutor implementation
*/
function is_tutor($user_id)
{
global $_course;
$course_user_table = Database :: get_main_table(TABLE_MAIN_COURSE_USER);
$sql = "SELECT tutor_id FROM ".$course_user_table."
WHERE `user_id`='".$user_id."'
AND `course_code`='".$_course['sysCode']."'"."AND tutor_id=1";
$db_result = api_sql_query($sql,__FILE__,__LINE__);
$result = (mysql_num_rows($db_result) > 0);
return $result;
}
/**
* Get all group's from a given course in which a given user is ubscribed
* @author Patrick Cool
* @param string $course_db: the database of the course you want to
* retrieve the groups for
* @param integer $user_id: the ID of the user you want to know all its
* group memberships
*/
function get_group_ids($course_db,$user_id)
{
$groups = array();
$tbl_group = Database::get_course_table(TABLE_GROUP_USER,$course_db);
$sql = "SELECT group_id FROM $tbl_group WHERE user_id = '$user_id'";
$groupres = api_sql_query($sql);
// uncommenting causes a bug in Agenda AND announcements because there we check if the return value of this function is an array or not
//$groups=array();
if($groupres)
{
while ($myrow= mysql_fetch_array($groupres))
$groups[]=$myrow['group_id'];
}
return $groups;
}
/*
-----------------------------------------------------------
Group functions
these take virtual/linked courses into account when necessary
-----------------------------------------------------------
*/
/**
* Get a combined list of all users of the real course $course_code
* and all users in virtual courses linked to this course $course_code
* Filter user list: remove duplicate users; plus
* remove users that
* - are already in the current group $group_id;
* - do not have student status in these courses;
* - are not appointed as tutor (group assistent) for this group;
* - have already reached their maximum # of groups in this course.
*
* Originally to get the correct list of users a big SQL statement was used,
* but this has become more complicated now there is not just one real course but many virtual courses.
* Still, that could have worked as well.
*
* @version 1.1.3
* @author Roan Embrechts
*/
function get_complete_list_of_users_that_can_be_added_to_group($course_code, $group_id)
{
global $_course, $_user;
$category = GroupManager :: get_category_from_group($group_id, $course_code);
$number_of_groups_limit = $category['groups_per_user'] == GROUP_PER_MEMBER_NO_LIMIT ? INFINITE : $category['groups_per_user'];
$real_course_code = $_course['sysCode'];
$real_course_info = Database :: get_course_info($real_course_code);
$real_course_user_list = CourseManager :: get_user_list_from_course_code($virtual_course_code);
//get list of all virtual courses
$user_subscribed_course_list = CourseManager :: get_list_of_virtual_courses_for_specific_user_and_real_course($_user['user_id'], $real_course_code);
//add real course to the list
$user_subscribed_course_list[] = $real_course_info;
if (!is_array($user_subscribed_course_list))
return;
//for all courses...
foreach ($user_subscribed_course_list as $this_course)
{
$this_course_code = $this_course["code"];
$course_user_list = CourseManager :: get_user_list_from_course_code($this_course_code);
//for all users in the course
foreach ($course_user_list as $this_user)
{
$user_id = $this_user["user_id"];
$loginname = $this_user["username"];
$lastname = $this_user["lastname"];
$firstname = $this_user["firstname"];
$status = $this_user["status"];
//$role = $this_user["role"];
$tutor_id = $this_user["tutor_id"];
$full_name = $lastname.", ".$firstname;
if ($lastname == "" || $firstname == '')
$full_name = $loginname;
$complete_user["user_id"] = $user_id;
$complete_user["full_name"] = $full_name;
$complete_user['firstname'] = $firstname;
$complete_user['lastname'] = $lastname;
$complete_user["status"] = $status;
$complete_user["tutor_id"] = $tutor_id;
$student_number_of_groups = GroupManager :: user_in_number_of_groups($user_id, $category['id']);
//filter: only add users that have not exceeded their maximum amount of groups
if ($student_number_of_groups < $number_of_groups_limit)
{
$complete_user_list[] = $complete_user;
}
}
}
if (is_array($complete_user_list))
{
//sort once, on array field "full_name"
$complete_user_list = TableSort :: sort_table($complete_user_list, "full_name");
//filter out duplicates, based on field "user_id"
$complete_user_list = GroupManager :: filter_duplicates($complete_user_list, "user_id");
$complete_user_list = GroupManager :: filter_users_already_in_group($complete_user_list, $group_id);
//$complete_user_list = GroupManager :: filter_only_students($complete_user_list);
}
return $complete_user_list;
}
/**
* Filter out duplicates in a multidimensional array
* by comparing field $compare_field.
*
* @param $user_array_in list of users (must be sorted).
* @param string $compare_field, the field to be compared
*/
function filter_duplicates($user_array_in, $compare_field)
{
$total_number = count($user_array_in);
$user_array_out[0] = $user_array_in[0];
$count_out = 0;
for ($count_in = 1; $count_in < $total_number; $count_in ++)
{
if ($user_array_in[$count_in][$compare_field] != $user_array_out[$count_out][$compare_field])
{
$count_out ++;
$user_array_out[$count_out] = $user_array_in[$count_in];
}
}
return $user_array_out;
}
/**
* Filters from the array $user_array_in the users already in the group $group_id.
*/
function filter_users_already_in_group($user_array_in, $group_id)
{
foreach ($user_array_in as $this_user)
{
if (!GroupManager :: is_subscribed($this_user['user_id'], $group_id))
{
$user_array_out[] = $this_user;
}
}
return $user_array_out;
}
/**
* Remove all users that are not students and all users who have tutor status
* from the list.
*/
function filter_only_students($user_array_in)
{
$user_array_out = array ();
foreach ($user_array_in as $this_user)
{
if ($this_user['status'] == STUDENT && $this_user['tutor_id'] == 0)
{
$user_array_out[] = $this_user;
}
}
return $user_array_out;
}
/**
* Check if a user has access to a certain group tool
* @param int $user_id The user id
* @param int $group_id The group id
* @param constant $tool The tool to check the access rights. This should be
* one of constants: GROUP_TOOL_DOCUMENTS
* @return bool True if the given user has access to the given tool in the
* given course.
*/
function user_has_access($user_id, $group_id, $tool)
{
switch ($tool)
{
case GROUP_TOOL_DOCUMENTS :
$state_key = 'doc_state';
break;
case GROUP_TOOL_CALENDAR :
$state_key = 'calendar_state';
break;
case GROUP_TOOL_ANNOUNCEMENT :
$state_key = 'announcements_state';
break;
case GROUP_TOOL_WORK :
$state_key = 'work_state';
break;
default:
return false;
}
$group = GroupManager :: get_group_properties($group_id);
if ($group[$state_key] == TOOL_NOT_AVAILABLE)
{
return false;
}
elseif ($group[$state_key] == TOOL_PUBLIC)
{
return true;
}
elseif (api_is_allowed_to_edit())
{
return true;
}
elseif($group['tutor_id'] == $user_id)
{
return true;
}
else
{
return GroupManager :: is_subscribed($user_id, $group_id);
}
}
/**
* Get all groups where a specific user is subscribed
*/
function get_user_group_name($user_id){
$table_group_user=Database::get_course_table(TABLE_GROUP_USER);
$table_group=Database::get_course_table(TABLE_GROUP);
$sql_groups = 'SELECT name FROM '.$table_group.' g,'.$table_group_user.' gu WHERE gu.user_id="'.$user_id.'" AND gu.group_id=g.id';
$res = api_sql_query($sql_groups,__FILE__,__LINE__);
$groups=array();
while($group = mysql_fetch_array($res))
{
$groups[] .= $group['name'];
}
return $groups;
}
}
?>

Source for file groupmanager.lib.php