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<?php // $Id$
///////////////////////////////////////////////////////////////////////////
// //
// NOTICE OF COPYRIGHT //
// //
// Moodle - Modular Object-Oriented Dynamic Learning Environment //
// http://moodle.org //
// //
// Copyright (C) 1999 onwards Martin Dougiamas, Moodle http://moodle.com//
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details: //
// //
// http://www.gnu.org/copyleft/gpl.html //
// //
///////////////////////////////////////////////////////////////////////////
/**
* deprecatedlib.php - Old functions retained only for backward compatibility
*
* Old functions retained only for backward compatibility. New code should not
* use any of these functions.
*
* @author Martin Dougiamas
* @version $Id$
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package moodlecore
*/
/**
* Ensure that a variable is set
*
* If $var is undefined throw an error, otherwise return $var.
*
* @param mixed $var the variable which may be unset
* @param mixed $default the value to return if $var is unset
*/
function require_variable($var) {
global $CFG;
if (!empty($CFG->disableglobalshack)) {
error( 'The require_variable() function is deprecated.' );
}
if (! isset($var)) {
error('A required parameter was missing');
}
}
/**
* Ensure that a variable is set
*
* If $var is undefined set it (by reference), otherwise return $var.
*
* @param mixed $var the variable which may be unset
* @param mixed $default the value to return if $var is unset
*/
function optional_variable(&$var, $default=0) {
global $CFG;
if (!empty($CFG->disableglobalshack)) {
error( "The optional_variable() function is deprecated ($var, $default)." );
}
if (! isset($var)) {
$var = $default;
}
}
/**
* Ensure that a variable is set
*
* Return $var if it is defined, otherwise return $default,
* This function is very similar to {@link optional_variable()}
*
* @param mixed $var the variable which may be unset
* @param mixed $default the value to return if $var is unset
* @return mixed
*/
function nvl(&$var, $default='') {
global $CFG;
if (!empty($CFG->disableglobalshack)) {
error( "The nvl() function is deprecated ($var, $default)." );
}
return isset($var) ? $var : $default;
}
/**
* Determines if a user an admin
*
* @uses $USER
* @param int $userid The id of the user as is found in the 'user' table
* @staticvar array $admins List of users who have been found to be admins by user id
* @staticvar array $nonadmins List of users who have been found not to be admins by user id
* @return bool
*/
function isadmin($userid=0) {
global $USER, $CFG;
if (empty($CFG->rolesactive)) { // Then the user is likely to be upgrading NOW
if (!$userid) {
if (empty($USER->id)) {
return false;
}
if (!empty($USER->admin)) {
return true;
}
$userid = $USER->id;
}
return record_exists('user_admins', 'userid', $userid);
}
$context = get_context_instance(CONTEXT_SYSTEM);
return has_capability('moodle/legacy:admin', $context, $userid, false);
}
/**
* Determines if a user is a teacher (or better)
*
* @uses $CFG
* @param int $courseid The id of the course that is being viewed, if any
* @param int $userid The id of the user that is being tested against. Set this to 0 if you would just like to test against the currently logged in user.
* @param bool $obsolete_includeadmin Not used any more
* @return bool
*/
function isteacher($courseid=0, $userid=0, $obsolete_includeadmin=true) {
/// Is the user able to access this course as a teacher?
global $CFG;
if (empty($CFG->rolesactive)) { // Teachers are locked out during an upgrade to 1.7
return false;
}
if ($courseid) {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
} else {
$context = get_context_instance(CONTEXT_SYSTEM);
}
return (has_capability('moodle/legacy:teacher', $context, $userid, false)
or has_capability('moodle/legacy:editingteacher', $context, $userid, false)
or has_capability('moodle/legacy:admin', $context, $userid, false));
}
/**
* Determines if a user is a teacher in any course, or an admin
*
* @uses $USER
* @param int $userid The id of the user that is being tested against. Set this to 0 if you would just like to test against the currently logged in user.
* @param bool $includeadmin Include anyone wo is an admin as well
* @return bool
*/
function isteacherinanycourse($userid=0, $includeadmin=true) {
global $USER, $CFG;
if (empty($CFG->rolesactive)) { // Teachers are locked out during an upgrade to 1.7
return false;
}
if (!$userid) {
if (empty($USER->id)) {
return false;
}
$userid = $USER->id;
}
if (!record_exists('role_assignments', 'userid', $userid)) { // Has no roles anywhere
return false;
}
/// If this user is assigned as an editing teacher anywhere then return true
if ($roles = get_roles_with_capability('moodle/legacy:editingteacher', CAP_ALLOW)) {
foreach ($roles as $role) {
if (record_exists('role_assignments', 'roleid', $role->id, 'userid', $userid)) {
return true;
}
}
}
/// If this user is assigned as a non-editing teacher anywhere then return true
if ($roles = get_roles_with_capability('moodle/legacy:teacher', CAP_ALLOW)) {
foreach ($roles as $role) {
if (record_exists('role_assignments', 'roleid', $role->id, 'userid', $userid)) {
return true;
}
}
}
/// Include admins if required
if ($includeadmin) {
$context = get_context_instance(CONTEXT_SYSTEM);
if (has_capability('moodle/legacy:admin', $context, $userid, false)) {
return true;
}
}
return false;
}
/**
* Determines if a user is allowed to edit a given course
*
* @param int $courseid The id of the course that is being edited
* @param int $userid The id of the user that is being tested against. Set this to 0 if you would just like to test against the currently logged in user.
* @return bool
*/
function isteacheredit($courseid, $userid=0, $obsolete_ignorestudentview=false) {
global $CFG;
if (empty($CFG->rolesactive)) {
return false;
}
if (empty($courseid)) {
$context = get_context_instance(CONTEXT_SYSTEM);
} else {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
}
return (has_capability('moodle/legacy:editingteacher', $context, $userid, false)
or has_capability('moodle/legacy:admin', $context, $userid, false));
}
/**
* Determines if a user can create new courses
*
* @param int $userid The user being tested. You can set this to 0 or leave it blank to test the currently logged in user.
* @return bool
*/
function iscreator ($userid=0) {
global $CFG;
if (empty($CFG->rolesactive)) {
return false;
}
$context = get_context_instance(CONTEXT_SYSTEM);
return (has_capability('moodle/legacy:coursecreator', $context, $userid, false)
or has_capability('moodle/legacy:admin', $context, $userid, false));
}
/**
* Determines if a user is a student in the specified course
*
* If the course id specifies the site then this determines
* if the user is a confirmed and valid user of this site.
*
* @uses $CFG
* @uses SITEID
* @param int $courseid The id of the course being tested
* @param int $userid The user being tested. You can set this to 0 or leave it blank to test the currently logged in user.
* @return bool
*/
function isstudent($courseid=0, $userid=0) {
global $CFG;
if (empty($CFG->rolesactive)) {
return false;
}
if ($courseid == 0) {
$context = get_context_instance(CONTEXT_SYSTEM);
} else {
$context = get_context_instance(CONTEXT_COURSE, $courseid);
}
return has_capability('moodle/legacy:student', $context, $userid, false);
}
/**
* Determines if the specified user is logged in as guest.
*
* @param int $userid The user being tested. You can set this to 0 or leave it blank to test the currently logged in user.
* @return bool
*/
function isguest($userid=0) {
global $CFG;
if (empty($CFG->rolesactive)) {
return false;
}
$context = get_context_instance(CONTEXT_SYSTEM);
return has_capability('moodle/legacy:guest', $context, $userid, false);
}
/**
* Enrols (or re-enrols) a student in a given course
*
* NOTE: Defaults to 'manual' enrolment - enrolment plugins
* must set it explicitly.
*
* @uses $CFG
* @param int $userid The id of the user that is being tested against. Set this to 0 if you would just like to test against the currently logged in user.
* @param int $courseid The id of the course that is being viewed
* @param int $timestart ?
* @param int $timeend ?
* @param string $enrol ?
* @return bool
*/
function enrol_student($userid, $courseid, $timestart=0, $timeend=0, $enrol='manual') {
global $CFG;
if (!$user = get_record('user', 'id', $userid)) { // Check user
return false;
}
if (!$roles = get_roles_with_capability('moodle/legacy:student', CAP_ALLOW)) {
return false;
}
$role = array_shift($roles); // We can only use one, let's use the first one
if (!$context = get_context_instance(CONTEXT_COURSE, $courseid)) {
return false;
}
$res = role_assign($role->id, $user->id, 0, $context->id, $timestart, $timeend, 0, $enrol);
return $res;
}
/**
* Unenrols a student from a given course
*
* @param int $courseid The id of the course that is being viewed, if any
* @param int $userid The id of the user that is being tested against.
* @return bool
*/
function unenrol_student($userid, $courseid=0) {
global $CFG;
$status = true;
if ($courseid) {
/// First delete any crucial stuff that might still send mail
if ($forums = get_records('forum', 'course', $courseid)) {
foreach ($forums as $forum) {
delete_records('forum_subscriptions', 'forum', $forum->id, 'userid', $userid);
}
}
/// remove from all legacy student roles
if ($courseid == SITEID) {
$context = get_context_instance(CONTEXT_SYSTEM);
} else if (!$context = get_context_instance(CONTEXT_COURSE, $courseid)) {
return false;
}
if (!$roles = get_roles_with_capability('moodle/legacy:student', CAP_ALLOW)) {
return false;
}
foreach($roles as $role) {
$status = role_unassign($role->id, $userid, 0, $context->id) and $status;
}
} else {
// recursivelly unenroll student from all courses
if ($courses = get_records('course')) {
foreach($courses as $course) {
$status = unenrol_student($userid, $course->id) and $status;
}
}
}
return $status;
}
/**
* Add a teacher to a given course
*
* @param int $userid The id of the user that is being tested against. Set this to 0 if you would just like to test against the currently logged in user.
* @param int $courseid The id of the course that is being viewed, if any
* @param int $editall Can edit the course
* @param string $role Obsolete
* @param int $timestart The time they start
* @param int $timeend The time they end in this role
* @param string $enrol The type of enrolment this is
* @return bool
*/
function add_teacher($userid, $courseid, $editall=1, $role='', $timestart=0, $timeend=0, $enrol='manual') {
global $CFG;
if (!$user = get_record('user', 'id', $userid)) { // Check user
return false;
}
$capability = $editall ? 'moodle/legacy:editingteacher' : 'moodle/legacy:teacher';
if (!$roles = get_roles_with_capability($capability, CAP_ALLOW)) {
return false;
}
$role = array_shift($roles); // We can only use one, let's use the first one
if (!$context = get_context_instance(CONTEXT_COURSE, $courseid)) {
return false;
}
$res = role_assign($role->id, $user->id, 0, $context->id, $timestart, $timeend, 0, $enrol);
return $res;
}
/**
* Removes a teacher from a given course (or ALL courses)
* Does not delete the user account
*
* @param int $courseid The id of the course that is being viewed, if any
* @param int $userid The id of the user that is being tested against.
* @return bool
*/
function remove_teacher($userid, $courseid=0) {
global $CFG;
$roles = get_roles_with_capability('moodle/legacy:editingteacher', CAP_ALLOW);
if ($roles) {
$roles += get_roles_with_capability('moodle/legacy:teacher', CAP_ALLOW);
} else {
$roles = get_roles_with_capability('moodle/legacy:teacher', CAP_ALLOW);
}
if (empty($roles)) {
return true;
}
$return = true;
if ($courseid) {
if (!$context = get_context_instance(CONTEXT_COURSE, $courseid)) {
return false;
}
/// First delete any crucial stuff that might still send mail
if ($forums = get_records('forum', 'course', $courseid)) {
foreach ($forums as $forum) {
delete_records('forum_subscriptions', 'forum', $forum->id, 'userid', $userid);
}
}
/// No need to remove from groups now
foreach ($roles as $role) { // Unassign them from all the teacher roles
$newreturn = role_unassign($role->id, $userid, 0, $context->id);
if (empty($newreturn)) {
$return = false;
}
}
} else {
delete_records('forum_subscriptions', 'userid', $userid);
$return = true;
foreach ($roles as $role) { // Unassign them from all the teacher roles
$newreturn = role_unassign($role->id, $userid, 0, 0);
if (empty($newreturn)) {
$return = false;
}
}
}
return $return;
}
/**
* Add an admin to a site
*
* @uses SITEID
* @param int $userid The id of the user that is being tested against.
* @return bool
* @TODO: remove from cvs
*/
function add_admin($userid) {
return true;
}
function get_user_info_from_db($field, $value) { // For backward compatibility
return get_complete_user_data($field, $value);
}
/**
* Get the guest user information from the database
*
* @return object(user) An associative array with the details of the guest user account.
* @todo Is object(user) a correct return type? Or is array the proper return type with a note that the contents include all details for a user.
*/
function get_guest() {
return get_complete_user_data('username', 'guest');
}
/**
* Returns $user object of the main teacher for a course
*
* @uses $CFG
* @param int $courseid The course in question.
* @return user|false A {@link $USER} record of the main teacher for the specified course or false if error.
* @todo Finish documenting this function
*/
function get_teacher($courseid) {
global $CFG;
$context = get_context_instance(CONTEXT_COURSE, $courseid);
// Pass $view=true to filter hidden caps if the user cannot see them
if ($users = get_users_by_capability($context, 'moodle/course:update', 'u.*', 'u.id ASC',
'', '', '', '', false, true)) {
$users = sort_by_roleassignment_authority($users, $context);
return array_shift($users);
}
return false;
}
/**
* Searches logs to find all enrolments since a certain date
*
* used to print recent activity
*
* @uses $CFG
* @param int $courseid The course in question.
* @return object|false {@link $USER} records or false if error.
* @todo Finish documenting this function
*/
function get_recent_enrolments($courseid, $timestart) {
global $CFG;
$context = get_context_instance(CONTEXT_COURSE, $courseid);
return get_records_sql("SELECT DISTINCT u.id, u.firstname, u.lastname, l.time
FROM {$CFG->prefix}user u,
{$CFG->prefix}role_assignments ra,
{$CFG->prefix}log l
WHERE l.time > '$timestart'
AND l.course = '$courseid'
AND l.module = 'course'
AND l.action = 'enrol'
AND ".sql_cast_char2int('l.info')." = u.id
AND u.id = ra.userid
AND ra.contextid ".get_related_contexts_string($context)."
ORDER BY l.time ASC");
}
/**
* Returns array of userinfo of all students in this course
* or on this site if courseid is id of site
*
* @uses $CFG
* @uses SITEID
* @param int $courseid The course in question.
* @param string $sort ?
* @param string $dir ?
* @param int $page ?
* @param int $recordsperpage ?
* @param string $firstinitial ?
* @param string $lastinitial ?
* @param ? $group ?
* @param string $search ?
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @param string $exceptions ?
* @return object
* @todo Finish documenting this function
*/
function get_course_students($courseid, $sort='ul.timeaccess', $dir='', $page='', $recordsperpage='',
$firstinitial='', $lastinitial='', $group=NULL, $search='', $fields='', $exceptions='') {
global $CFG;
// make sure it works on the site course
$context = get_context_instance(CONTEXT_COURSE, $courseid);
/// For the site course, old way was to check if $CFG->allusersaresitestudents was set to true.
/// The closest comparible method using roles is if the $CFG->defaultuserroleid is set to the legacy
/// student role. This function should be replaced where it is used with something more meaningful.
if (($courseid == SITEID) && !empty($CFG->defaultuserroleid) && empty($CFG->nodefaultuserrolelists)) {
if ($roles = get_roles_with_capability('moodle/legacy:student', CAP_ALLOW, $context)) {
$hascap = false;
foreach ($roles as $role) {
if ($role->id == $CFG->defaultuserroleid) {
$hascap = true;
break;
}
}
if ($hascap) {
if (empty($fields)) {
$fields = '*';
}
// return users with confirmed, undeleted accounts who are not site teachers
// the following is a mess because of different conventions in the different user functions
$sort = str_replace('s.timeaccess', 'lastaccess', $sort); // site users can't be sorted by timeaccess
$sort = str_replace('timeaccess', 'lastaccess', $sort); // site users can't be sorted by timeaccess
$sort = str_replace('u.', '', $sort); // the get_user function doesn't use the u. prefix to fields
$sort = str_replace('ul.', '', $sort); // the get_user function doesn't use the ul. prefix to fields
// the following is a mess because of different conventions in the different user functions. MDL-17200
$fields = str_replace('u.', '', $fields);
$fields = str_replace('ul.', '', $fields);
$fields = str_replace('timeaccess', 'lastaccess', $fields);
if ($sort) {
$sort = $sort .' '. $dir;
}
// Now we have to make sure site teachers are excluded
if ($teachers = get_course_teachers(SITEID)) {
foreach ($teachers as $teacher) {
$exceptions .= ','. $teacher->userid;
}
$exceptions = ltrim($exceptions, ',');
}
return get_users(true, $search, true, $exceptions, $sort, $firstinitial, $lastinitial,
$page, $recordsperpage, $fields);
}
}
}
$LIKE = sql_ilike();
$fullname = sql_fullname('u.firstname','u.lastname');
$groupmembers = '';
$select = "c.contextlevel=".CONTEXT_COURSE." AND "; // Must be on a course
if ($courseid != SITEID) {
// If not site, require specific course
$select.= "c.instanceid=$courseid AND ";
}
$select.="rc.capability='moodle/legacy:student' AND rc.permission=".CAP_ALLOW." AND ";
$select .= ' u.deleted = \'0\' ';
if (!$fields) {
$fields = 'u.id, u.confirmed, u.username, u.firstname, u.lastname, '.
'u.maildisplay, u.mailformat, u.maildigest, u.email, u.city, '.
'u.country, u.picture, u.idnumber, u.department, u.institution, '.
'u.emailstop, u.lang, u.timezone, ul.timeaccess as lastaccess';
}
if ($search) {
$search = ' AND ('. $fullname .' '. $LIKE .'\'%'. $search .'%\' OR email '. $LIKE .'\'%'. $search .'%\') ';
}
if ($firstinitial) {
$select .= ' AND u.firstname '. $LIKE .'\''. $firstinitial .'%\' ';
}
if ($lastinitial) {
$select .= ' AND u.lastname '. $LIKE .'\''. $lastinitial .'%\' ';
}
if ($group === 0) { /// Need something here to get all students not in a group
return array();
} else if ($group !== NULL) {
$groupmembers = "INNER JOIN {$CFG->prefix}groups_members gm on u.id=gm.userid";
$select .= ' AND gm.groupid = \''. $group .'\'';
}
if (!empty($exceptions)) {
$select .= ' AND u.id NOT IN ('. $exceptions .')';
}
if ($sort) {
$sort = ' ORDER BY '. $sort .' ';
}
$students = get_records_sql("SELECT $fields
FROM {$CFG->prefix}user u INNER JOIN
{$CFG->prefix}role_assignments ra on u.id=ra.userid INNER JOIN
{$CFG->prefix}role_capabilities rc ON ra.roleid=rc.roleid INNER JOIN
{$CFG->prefix}context c ON c.id=ra.contextid LEFT OUTER JOIN
{$CFG->prefix}user_lastaccess ul on ul.userid=ra.userid AND ul.courseid = $courseid
$groupmembers
WHERE $select $search $sort $dir", $page, $recordsperpage);
return $students;
}
/**
* Counts the students in a given course (or site), or a subset of them
*
* @param object $course The course in question as a course object.
* @param string $search ?
* @param string $firstinitial ?
* @param string $lastinitial ?
* @param ? $group ?
* @param string $exceptions ?
* @return int
* @todo Finish documenting this function
*/
function count_course_students($course, $search='', $firstinitial='', $lastinitial='', $group=NULL, $exceptions='') {
if ($students = get_course_students($course->id, '', '', 0, 999999, $firstinitial, $lastinitial, $group, $search, '', $exceptions)) {
return count($students);
}
return 0;
}
/**
* Returns list of all teachers in this course
*
* If $courseid matches the site id then this function
* returns a list of all teachers for the site.
*
* @uses $CFG
* @param int $courseid The course in question.
* @param string $sort ?
* @param string $exceptions ?
* @return object
* @todo Finish documenting this function
*/
function get_course_teachers($courseid, $sort='t.authority ASC', $exceptions='') {
global $CFG;
$sort = 'ul.timeaccess DESC';
$context = get_context_instance(CONTEXT_COURSE, $courseid);
/// For the site course, if the $CFG->defaultuserroleid is set to the legacy teacher role, then all
/// users are teachers. This function should be replaced where it is used with something more
/// meaningful.
if (($courseid == SITEID) && !empty($CFG->defaultuserroleid) && empty($CFG->nodefaultuserrolelists)) {
if ($roles = get_roles_with_capability('moodle/legacy:teacher', CAP_ALLOW, $context)) {
$hascap = false;
foreach ($roles as $role) {
if ($role->id == $CFG->defaultuserroleid) {
$hascap = true;
break;
}
}
if ($hascap) {
if (empty($fields)) {
$fields = '*';
}
return get_users(true, '', true, $exceptions, 'lastname ASC', '', '', '', '', $fields);
}
}
}
$users = get_users_by_capability($context, 'moodle/course:update',
'u.*, ul.timeaccess as lastaccess',
$sort, '','','',$exceptions, false);
return sort_by_roleassignment_authority($users, $context);
/// some fields will be missing, like authority, editall
/*
return get_records_sql("SELECT u.id, u.username, u.firstname, u.lastname, u.maildisplay, u.mailformat, u.maildigest,
u.email, u.city, u.country, u.lastlogin, u.picture, u.lang, u.timezone,
u.emailstop, t.authority,t.role,t.editall,t.timeaccess as lastaccess
FROM {$CFG->prefix}user u,
{$CFG->prefix}user_teachers t
WHERE t.course = '$courseid' AND t.userid = u.id
AND u.deleted = '0' AND u.confirmed = '1' $exceptions $sort");
*/
}
/**
* Returns all the users of a course: students and teachers
*
* @param int $courseid The course in question.
* @param string $sort ?
* @param string $exceptions A comma separated list of user->id to be skiped in the result returned by the function
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set).
* @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set).
* @todo Finish documenting this function
*/
function get_course_users($courseid, $sort='ul.timeaccess DESC', $exceptions='', $fields='u.*, ul.timeaccess as lastaccess', $limitfrom='', $limitnum='') {
global $CFG;
$context = get_context_instance(CONTEXT_COURSE, $courseid);
/// If the course id is the SITEID, we need to return all the users if the "defaultuserroleid"
/// has the capbility of accessing the site course. $CFG->nodefaultuserrolelists set to true can
/// over-rule using this.
if (($courseid == SITEID) && !empty($CFG->defaultuserroleid) && empty($CFG->nodefaultuserrolelists)) {
if ($roles = get_roles_with_capability('moodle/course:view', CAP_ALLOW, $context)) {
$hascap = false;
foreach ($roles as $role) {
if ($role->id == $CFG->defaultuserroleid) {
$hascap = true;
break;
}
}
if ($hascap) {
if (empty($fields)) {
$fields = '*';
}
// the following is a mess because of different conventions in the different user functions. MDL-17200
$fields = str_replace('u.', '', $fields);
$fields = str_replace('ul.', '', $fields);
$fields = str_replace('timeaccess', 'lastaccess', $fields);
return get_users(true, '', true, $exceptions, 'lastname ASC', '', '', $limitfrom, $limitnum, $fields);
}
}
}
return get_users_by_capability($context, 'moodle/course:view', $fields, $sort, $limitfrom, $limitnum,'',$exceptions, false);
}
/**
* Returns an array of user objects
*
* @uses $CFG
* @param int $groupid The group(s) in question.
* @param string $sort How to sort the results
* @return object (changed to groupids)
*/
function get_group_students($groupids, $sort='ul.timeaccess DESC') {
if (is_array($groupids)){
$groups = $groupids;
// all groups must be from one course anyway...
$group = groups_get_group(array_shift($groups));
} else {
$group = groups_get_group($groupids);
}
if (!$group) {
return NULL;
}
$context = get_context_instance(CONTEXT_COURSE, $group->courseid);
return get_users_by_capability($context, 'moodle/legacy:student', 'u.*, ul.timeaccess as lastaccess', $sort, '','',$groupids, '', false);
}
/**
* Returns list of all the teachers who can access a group
*
* @uses $CFG
* @param int $courseid The course in question.
* @param int $groupid The group in question.
* @return object
*/
function get_group_teachers($courseid, $groupid) {
/// Returns a list of all the teachers who can access a group
if ($teachers = get_course_teachers($courseid)) {
foreach ($teachers as $key => $teacher) {
if ($teacher->editall) { // These can access anything
continue;
}
if (($teacher->authority > 0) and groups_is_member($groupid, $teacher->id)) { // Specific group teachers
continue;
}
unset($teachers[$key]);
}
}
return $teachers;
}
########### FROM weblib.php ##########################################################################
/**
* Creates a nicely formatted table and returns it.
*
* @param array $table is an object with several properties.
* <ul<li>$table->head - An array of heading names.
* <li>$table->align - An array of column alignments
* <li>$table->size - An array of column sizes
* <li>$table->wrap - An array of "nowrap"s or nothing
* <li>$table->data[] - An array of arrays containing the data.
* <li>$table->class - A css class name
* <li>$table->fontsize - Is the size of all the text
* <li>$table->tablealign - Align the whole table
* <li>$table->width - A percentage of the page
* <li>$table->cellpadding - Padding on each cell
* <li>$table->cellspacing - Spacing between cells
* </ul>
* @return string
* @todo Finish documenting this function
*/
function make_table($table) {
return print_table($table, true);
}
/**
* Print a message in a standard themed box.
* This old function used to implement boxes using tables. Now it uses a DIV, but the old
* parameters remain. If possible, $align, $width and $color should not be defined at all.
* Preferably just use print_box() in weblib.php
*
* @param string $align, alignment of the box, not the text (default center, left, right).
* @param string $width, width of the box, including units %, for example '100%'.
* @param string $color, background colour of the box, for example '#eee'.
* @param int $padding, padding in pixels, specified without units.
* @param string $class, space-separated class names.
* @param string $id, space-separated id names.
* @param boolean $return, return as string or just print it
*/
function print_simple_box($message, $align='', $width='', $color='', $padding=5, $class='generalbox', $id='', $return=false) {
$output = '';
$output .= print_simple_box_start($align, $width, $color, $padding, $class, $id, true);
$output .= stripslashes_safe($message);
$output .= print_simple_box_end(true);
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* This old function used to implement boxes using tables. Now it uses a DIV, but the old
* parameters remain. If possible, $align, $width and $color should not be defined at all.
* Even better, please use print_box_start() in weblib.php
*
* @param string $align, alignment of the box, not the text (default center, left, right). DEPRECATED
* @param string $width, width of the box, including % units, for example '100%'. DEPRECATED
* @param string $color, background colour of the box, for example '#eee'. DEPRECATED
* @param int $padding, padding in pixels, specified without units. OBSOLETE
* @param string $class, space-separated class names.
* @param string $id, space-separated id names.
* @param boolean $return, return as string or just print it
*/
function print_simple_box_start($align='', $width='', $color='', $padding=5, $class='generalbox', $id='', $return=false) {
$output = '';
$divclasses = 'box '.$class.' '.$class.'content';
$divstyles = '';
if ($align) {
$divclasses .= ' boxalign'.$align; // Implement alignment using a class
}
if ($width) { // Hopefully we can eliminate these in calls to this function (inline styles are bad)
if (substr($width, -1, 1) == '%') { // Width is a % value
$width = (int) substr($width, 0, -1); // Extract just the number
if ($width < 40) {
$divclasses .= ' boxwidthnarrow'; // Approx 30% depending on theme
} else if ($width > 60) {
$divclasses .= ' boxwidthwide'; // Approx 80% depending on theme
} else {
$divclasses .= ' boxwidthnormal'; // Approx 50% depending on theme
}
} else {
$divstyles .= ' width:'.$width.';'; // Last resort
}
}
if ($color) { // Hopefully we can eliminate these in calls to this function (inline styles are bad)
$divstyles .= ' background:'.$color.';';
}
if ($divstyles) {
$divstyles = ' style="'.$divstyles.'"';
}
if ($id) {
$id = ' id="'.$id.'"';
}
$output .= '<div'.$id.$divstyles.' class="'.$divclasses.'">';
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Print the end portion of a standard themed box.
* Preferably just use print_box_end() in weblib.php
*/
function print_simple_box_end($return=false) {
$output = '</div>';
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* deprecated - use clean_param($string, PARAM_FILE); instead
* Check for bad characters ?
*
* @param string $string ?
* @param int $allowdots ?
* @todo Finish documenting this function - more detail needed in description as well as details on arguments
*/
function detect_munged_arguments($string, $allowdots=1) {
if (substr_count($string, '..') > $allowdots) { // Sometimes we allow dots in references
return true;
}
if (ereg('[\|\`]', $string)) { // check for other bad characters
return true;
}
if (empty($string) or $string == '/') {
return true;
}
return false;
}
/** Deprecated function - returns the code of the current charset - originally depended on the selected language pack.
*
* @param $ignorecache not used anymore
* @return string always returns 'UTF-8'
*/
function current_charset($ignorecache = false) {
return 'UTF-8';
}
/////////////////////////////////////////////////////////////
/// Old functions not used anymore - candidates for removal
/////////////////////////////////////////////////////////////
/**
* Load a template from file - this function dates back to Moodle 1 :-) not used anymore
*
* Returns a (big) string containing the contents of a template file with all
* the variables interpolated. all the variables must be in the $var[] array or
* object (whatever you decide to use).
*
* <b>WARNING: do not use this on big files!!</b>
*
* @param string $filename Location on the server's filesystem where template can be found.
* @param mixed $var Passed in by reference. An array or object which will be loaded with data from the template file.
*
*/
function read_template($filename, &$var) {
$temp = str_replace("\\", "\\\\", implode(file($filename), ''));
$temp = str_replace('"', '\"', $temp);
eval("\$template = \"$temp\";");
return $template;
}
/**
* deprecated - relies on register globals; use new formslib instead
*
* Set a variable's value depending on whether or not it already has a value.
*
* If variable is set, set it to the set_value otherwise set it to the
* unset_value. used to handle checkboxes when you are expecting them from
* a form
*
* @param mixed $var Passed in by reference. The variable to check.
* @param mixed $set_value The value to set $var to if $var already has a value.
* @param mixed $unset_value The value to set $var to if $var does not already have a value.
*/
function checked(&$var, $set_value = 1, $unset_value = 0) {
if (empty($var)) {
$var = $unset_value;
} else {
$var = $set_value;
}
}
/**
* deprecated - use new formslib instead
*
* Prints the word "checked" if a variable is true, otherwise prints nothing,
* used for printing the word "checked" in a checkbox form element.
*
* @param boolean $var Variable to be checked for true value
* @param string $true_value Value to be printed if $var is true
* @param string $false_value Value to be printed if $var is false
*/
function frmchecked(&$var, $true_value = 'checked', $false_value = '') {
if ($var) {
echo $true_value;
} else {
echo $false_value;
}
}
/**
* Legacy function, provided for backward compatability.
* This method now simply calls {@link use_html_editor()}
*
* @deprecated Use {@link use_html_editor()} instead.
* @param string $name Form element to replace with HTMl editor by name
* @todo Finish documenting this function
*/
function print_richedit_javascript($form, $name, $source='no') {
use_html_editor($name);
}
/** various deprecated groups function **/
/**
* Returns the table in which group members are stored, with a prefix 'gm'.
* @return SQL string.
*/
function groups_members_from_sql() {
global $CFG;
return " {$CFG->prefix}groups_members gm ";
}
/**
* Returns a join testing user.id against member's user ID.
* Relies on 'user' table being included as 'user u'.
* Used in Quiz module reports.
* @param group ID, optional to include a test for this in the SQL.
* @return SQL string.
*/
function groups_members_join_sql($groupid=false) {
$sql = ' JOIN '.groups_members_from_sql().' ON u.id = gm.userid ';
if ($groupid) {
$sql = "AND gm.groupid = '$groupid' ";
}
return $sql;
}
/**
* Returns SQL for a WHERE clause testing the group ID.
* Optionally test the member's ID against another table's user ID column.
* @param groupid
* @param userid_sql Optional user ID column selector, example "mdl_user.id", or false.
* @return SQL string.
*/
function groups_members_where_sql($groupid, $userid_sql=false) {
$sql = " gm.groupid = '$groupid' ";
if ($userid_sql) {
$sql .= "AND $userid_sql = gm.userid ";
}
return $sql;
}
/**
* Returns an array of group objects that the user is a member of
* in the given course. If userid isn't specified, then return a
* list of all groups in the course.
*
* @uses $CFG
* @param int $courseid The id of the course in question.
* @param int $userid The id of the user in question as found in the 'user' table 'id' field.
* @return object
*/
function get_groups($courseid, $userid=0) {
return groups_get_all_groups($courseid, $userid);
}
/**
* Returns the user's groups in a particular course
* note: this function originally returned only one group
*
* @uses $CFG
* @param int $courseid The course in question.
* @param int $userid The id of the user as found in the 'user' table.
* @param int $groupid The id of the group the user is in.
* @return aray of groups
*/
function user_group($courseid, $userid) {
return groups_get_all_groups($courseid, $userid);
}
/**
* Determines if the user is a member of the given group.
*
* @param int $groupid The group to check for membership.
* @param int $userid The user to check against the group.
* @return boolean True if the user is a member, false otherwise.
*/
function ismember($groupid, $userid = null) {
return groups_is_member($groupid, $userid);
}
/**
* Get the IDs for the user's groups in the given course.
*
* @uses $USER
* @param int $courseid The course being examined - the 'course' table id field.
* @return array An _array_ of groupids.
* (Was return $groupids[0] - consequences!)
*/
function mygroupid($courseid) {
global $USER;
if ($groups = groups_get_all_groups($courseid, $USER->id)) {
return array_keys($groups);
} else {
return false;
}
}
/**
* Add a user to a group, return true upon success or if user already a group
* member
*
* @param int $groupid The group id to add user to
* @param int $userid The user id to add to the group
* @return bool
*/
function add_user_to_group($groupid, $userid) {
global $CFG;
require_once($CFG->dirroot.'/group/lib.php');
return groups_add_member($groupid, $userid);
}
/**
* Returns an array of user objects
*
* @uses $CFG
* @param int $groupid The group in question.
* @param string $sort ?
* @param string $exceptions A comma separated list of user->id to be skiped in the result returned by the function
* @param string $fields A comma separated list of fields to be returned from the chosen table.
* @param int $limitfrom return a subset of records, starting at this point (optional, required if $limitnum is set).
* @param int $limitnum return a subset comprising this many records (optional, required if $limitfrom is set).
* @return array array of user objects
* @todo Finish documenting this function
*/
function get_group_users($groupid, $sort='u.lastaccess DESC', $exceptions='', $fields='u.*', $limitfrom='', $limitnum='') {
global $CFG;
if (!empty($exceptions)) {
$except = ' AND u.id NOT IN ('. $exceptions .') ';
} else {
$except = '';
}
// in postgres, you can't have things in sort that aren't in the select, so...
$extrafield = str_replace('ASC','',$sort);
$extrafield = str_replace('DESC','',$extrafield);
$extrafield = trim($extrafield);
if (!empty($extrafield)) {
$extrafield = ','.$extrafield;
}
return get_records_sql("SELECT DISTINCT $fields $extrafield
FROM {$CFG->prefix}user u,
{$CFG->prefix}groups_members m
WHERE m.groupid = '$groupid'
AND m.userid = u.id $except
ORDER BY $sort",
$limitfrom, $limitnum);
}
/**
* Returns the current group mode for a given course or activity module
*
* Could be false, SEPARATEGROUPS or VISIBLEGROUPS (<-- Martin)
*/
function groupmode($course, $cm=null) {
if (isset($cm->groupmode) && empty($course->groupmodeforce)) {
return $cm->groupmode;
}
return $course->groupmode;
}
/**
* Sets the current group in the session variable
* When $SESSION->currentgroup[$courseid] is set to 0 it means, show all groups.
* Sets currentgroup[$courseid] in the session variable appropriately.
* Does not do any permission checking.
* @uses $SESSION
* @param int $courseid The course being examined - relates to id field in
* 'course' table.
* @param int $groupid The group being examined.
* @return int Current group id which was set by this function
*/
function set_current_group($courseid, $groupid) {
global $SESSION;
return $SESSION->currentgroup[$courseid] = $groupid;
}
/**
* Gets the current group - either from the session variable or from the database.
*
* @uses $USER
* @uses $SESSION
* @param int $courseid The course being examined - relates to id field in
* 'course' table.
* @param bool $full If true, the return value is a full record object.
* If false, just the id of the record.
*/
function get_current_group($courseid, $full = false) {
global $SESSION;
if (isset($SESSION->currentgroup[$courseid])) {
if ($full) {
return groups_get_group($SESSION->currentgroup[$courseid]);
} else {
return $SESSION->currentgroup[$courseid];
}
}
$mygroupid = mygroupid($courseid);
if (is_array($mygroupid)) {
$mygroupid = array_shift($mygroupid);
set_current_group($courseid, $mygroupid);
if ($full) {
return groups_get_group($mygroupid);
} else {
return $mygroupid;
}
}
if ($full) {
return false;
} else {
return 0;
}
}
/**
* A combination function to make it easier for modules
* to set up groups.
*
* It will use a given "groupid" parameter and try to use
* that to reset the current group for the user.
*
* @uses VISIBLEGROUPS
* @param course $course A {@link $COURSE} object
* @param int $groupmode Either NOGROUPS, SEPARATEGROUPS or VISIBLEGROUPS
* @param int $groupid Will try to use this optional parameter to
* reset the current group for the user
* @return int|false Returns the current group id or false if error.
*/
function get_and_set_current_group($course, $groupmode, $groupid=-1) {
// Sets to the specified group, provided the current user has view permission
if (!$groupmode) { // Groups don't even apply
return false;
}
$currentgroupid = get_current_group($course->id);
if ($groupid < 0) { // No change was specified
return $currentgroupid;
}
$context = get_context_instance(CONTEXT_COURSE, $course->id);
if ($groupid and $group = get_record('groups', 'id', $groupid)) { // Try to change the current group to this groupid
if ($group->courseid == $course->id) {
if (has_capability('moodle/site:accessallgroups', $context)) { // Sets current default group
$currentgroupid = set_current_group($course->id, $groupid);
} elseif ($groupmode == VISIBLEGROUPS) {
// All groups are visible
//if (groups_is_member($group->id)){
$currentgroupid = set_current_group($course->id, $groupid); //set this since he might post
/*)}else {
$currentgroupid = $group->id;*/
} elseif ($groupmode == SEPARATEGROUPS) { // student in separate groups switching
if (groups_is_member($groupid)) { //check if is a member
$currentgroupid = set_current_group($course->id, $groupid); //might need to set_current_group?
}
else {
notify('You do not belong to this group! ('.$groupid.')', 'error');
}
}
}
} else { // When groupid = 0 it means show ALL groups
// this is changed, non editting teacher needs access to group 0 as well,
// for viewing work in visible groups (need to set current group for multiple pages)
if (has_capability('moodle/site:accessallgroups', $context)) { // Sets current default group
$currentgroupid = set_current_group($course->id, 0);
} else if ($groupmode == VISIBLEGROUPS) { // All groups are visible
$currentgroupid = set_current_group($course->id, 0);
}
}
return $currentgroupid;
}
/**
* A big combination function to make it easier for modules
* to set up groups.
*
* Terminates if the current user shouldn't be looking at this group
* Otherwise returns the current group if there is one
* Otherwise returns false if groups aren't relevant
*
* @uses SEPARATEGROUPS
* @uses VISIBLEGROUPS
* @param course $course A {@link $COURSE} object
* @param int $groupmode Either NOGROUPS, SEPARATEGROUPS or VISIBLEGROUPS
* @param string $urlroot ?
* @return int|false
*/
function setup_and_print_groups($course, $groupmode, $urlroot) {
global $USER, $SESSION; //needs his id, need to hack his groups in session
$changegroup = optional_param('group', -1, PARAM_INT);
$currentgroup = get_and_set_current_group($course, $groupmode, $changegroup);
if ($currentgroup === false) {
return false;
}
$context = get_context_instance(CONTEXT_COURSE, $course->id);
if ($groupmode == SEPARATEGROUPS and !$currentgroup and !has_capability('moodle/site:accessallgroups', $context)) {
//we are in separate groups and the current group is group 0, as last set.
//this can mean that either, this guy has no group
//or, this guy just came from a visible all forum, and he left when he set his current group to 0 (show all)
if ($usergroups = groups_get_all_groups($course->id, $USER->id)){
//for the second situation, we need to perform the trick and get him a group.
$first = reset($usergroups);
$currentgroup = get_and_set_current_group($course, $groupmode, $first->id);
} else {
//else he has no group in this course
print_heading(get_string('notingroup'));
print_footer($course);
exit;
}
}
if ($groupmode == VISIBLEGROUPS or ($groupmode and has_capability('moodle/site:accessallgroups', $context))) {
if ($groups = groups_get_all_groups($course->id)) {
echo '<div class="groupselector">';
print_group_menu($groups, $groupmode, $currentgroup, $urlroot, 1);
echo '</div>';
}
} else if ($groupmode == SEPARATEGROUPS and has_capability('moodle/course:view', $context)) {
//get all the groups this guy is in in this course
if ($usergroups = groups_get_all_groups($course->id, $USER->id)){
echo '<div class="groupselector">';
//print them in the menu
print_group_menu($usergroups, $groupmode, $currentgroup, $urlroot, 0);
echo '</div>';
}
}
return $currentgroup;
}
/**
* Prints an appropriate group selection menu
*
* @uses VISIBLEGROUPS
* @param array $groups ?
* @param int $groupmode ?
* @param string $currentgroup ?
* @param string $urlroot ?
* @param boolean $showall: if set to 0, it is a student in separate groups, do not display all participants
* @todo Finish documenting this function
*/
function print_group_menu($groups, $groupmode, $currentgroup, $urlroot, $showall=1, $return=false) {
$output = '';
$groupsmenu = array();
/// Add an "All groups" to the start of the menu
if ($showall){
$groupsmenu[0] = get_string('allparticipants');
}
foreach ($groups as $key => $group) {
$groupsmenu[$key] = format_string($group->name);
}
if ($groupmode == VISIBLEGROUPS) {
$grouplabel = get_string('groupsvisible');
} else {
$grouplabel = get_string('groupsseparate');
}
if (count($groupsmenu) == 1) {
$groupname = reset($groupsmenu);
$output .= $grouplabel.': '.$groupname;
} else {
$output .= popup_form($urlroot.'&amp;group=', $groupsmenu, 'selectgroup', $currentgroup, '', '', '', true, 'self', $grouplabel);
}
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* All users that we have not seen for a really long time (ie dead accounts)
* TODO: Delete this for Moodle 2.0
*
* @uses $CFG
* @deprecated The query is executed directly within admin/cron.php (MDL-11571)
* @param string $cutofftime ?
* @return object {@link $USER} records
*/
function get_users_longtimenosee($cutofftime) {
global $CFG;
return get_records_sql("SELECT id, userid, courseid
FROM {$CFG->prefix}user_lastaccess
WHERE courseid != ".SITEID."
AND timeaccess < $cutofftime ");
}
/**
* Full list of users that have not yet confirmed their accounts.
* TODO: Delete this for Moodle 2.0
*
* @uses $CFG
* @deprecated The query is executed directly within admin/cron.php (MDL-11487)
* @param string $cutofftime ?
* @return object {@link $USER} records
*/
function get_users_unconfirmed($cutofftime=2000000000) {
global $CFG;
return get_records_sql("SELECT *
FROM {$CFG->prefix}user
WHERE confirmed = 0
AND firstaccess > 0
AND firstaccess < $cutofftime");
}
/**
* Full list of bogus accounts that are probably not ever going to be used
* TODO: Delete this for Moodle 2.0
*
* @uses $CFG
* @deprecated The query is executed directly within admin/cron.php (MDL-11487)
* @param string $cutofftime ?
* @return object {@link $USER} records
*/
function get_users_not_fully_set_up($cutofftime=2000000000) {
global $CFG;
return get_records_sql("SELECT *
FROM {$CFG->prefix}user
WHERE confirmed = 1
AND lastaccess > 0
AND lastaccess < $cutofftime
AND deleted = 0
AND (lastname = '' OR firstname = '' OR email = '')");
}
/**
* Returns SQL to be used as a subselect to find the primary role of users.
* Geoff Cant <geoff@catalyst.net.nz> (the author) is very keen for this to
* be implemented as a view in future versions.
*
* eg if this function returns a string called $primaryroles, then you could:
* $sql = 'SELECT COUNT(DISTINCT prs.userid) FROM ('.$primary_roles.') prs
* WHERE prs.primary_roleid='.$role->id.' AND prs.courseid='.$course->id.
* ' AND prs.contextlevel = '.CONTEXT_COURSE;
*
* @return string the piece of SQL code to be used in your FROM( ) statement.
*/
function sql_primary_role_subselect() {
global $CFG;
return 'SELECT ra.userid,
ra.roleid AS primary_roleid,
ra.contextid,
r.sortorder,
r.name,
r.description,
r.shortname,
c.instanceid AS courseid,
c.contextlevel
FROM '.$CFG->prefix.'role_assignments ra
INNER JOIN '.$CFG->prefix.'role r ON ra.roleid = r.id
INNER JOIN '.$CFG->prefix.'context c ON ra.contextid = c.id
WHERE NOT EXISTS (
SELECT 1
FROM '.$CFG->prefix.'role_assignments i_ra
INNER JOIN '.$CFG->prefix.'role i_r ON i_ra.roleid = i_r.id
WHERE ra.userid = i_ra.userid AND
ra.contextid = i_ra.contextid AND
i_r.sortorder < r.sortorder
) ';
}
/**
* Can include a given document file (depends on second
* parameter) or just return info about it.
*
* @uses $CFG
* @param string $file ?
* @param bool $include ?
* @return ?
* @todo Finish documenting this function
*/
function document_file($file, $include=true) {
global $CFG;
debugging('The document_file() function is deprecated.', DEBUG_DEVELOPER);
$file = clean_filename($file);
if (empty($file)) {
return false;
}
$langs = array(current_language(), get_string('parentlanguage'), 'en');
foreach ($langs as $lang) {
$info = new object();
$info->filepath = $CFG->dirroot .'/lang/'. $lang .'/docs/'. $file;
$info->urlpath = $CFG->wwwroot .'/lang/'. $lang .'/docs/'. $file;
if (file_exists($info->filepath)) {
if ($include) {
include($info->filepath);
}
return $info;
}
}
return false;
}
/**
* Print an error page displaying an error message.
* Old method, don't call directly in new code - use print_error instead.
*
*
* @uses $SESSION
* @uses $CFG
* @param string $message The message to display to the user about the error.
* @param string $link The url where the user will be prompted to continue. If no url is provided the user will be directed to the site index page.
*/
function error ($message, $link='') {
global $CFG, $SESSION, $THEME;
$message = clean_text($message); // In case nasties are in here
if (defined('FULLME') && FULLME == 'cron') {
// Errors in cron should be mtrace'd.
mtrace($message);
die;
}
if (! defined('HEADER_PRINTED')) {
//header not yet printed
@header('HTTP/1.0 404 Not Found');
print_header(get_string('error'));
} else {
print_container_end_all(false, $THEME->open_header_containers);
}
echo '<br />';
print_simple_box($message, '', '', '', '', 'errorbox');
debugging('Stack trace:', DEBUG_DEVELOPER);
// in case we are logging upgrade in admin/index.php stop it
if (function_exists('upgrade_log_finish')) {
upgrade_log_finish();
}
if (empty($link) and !defined('ADMIN_EXT_HEADER_PRINTED')) {
if ( !empty($SESSION->fromurl) ) {
$link = $SESSION->fromurl;
unset($SESSION->fromurl);
} else {
$link = $CFG->wwwroot .'/';
}
}
// when printing an error the continue button should never link offsite
if (stripos($link, $CFG->wwwroot) === false &&
stripos($link, $CFG->httpswwwroot) === false) {
$link = $CFG->wwwroot.'/';
}
if (!empty($link)) {
print_continue($link);
}
print_footer();
for ($i=0;$i<512;$i++) { // Padding to help IE work with 404
echo ' ';
}
die;
}
?>
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