C:/xampp/htdocs/moodle/group/lib.php

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<?php
/*
 * INTERNAL FUNCTIONS - to be used by moodle core only
 * require_once $CFG->dirroot.'/group/lib.php' must be used
 */

function groups_add_member($grouporid, $userorid) {
    global $DB;

    if (is_object($userorid)) {
        $userid = $userorid->id;
        $user   = $userorid;
    } else {
        $userid = $userorid;
        $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
    }

    if (is_object($grouporid)) {
        $groupid = $grouporid->id;
        $group   = $grouporid;
    } else {
        $groupid = $grouporid;
        $group = $DB->get_record('groups', array('id'=>$groupid), '*', MUST_EXIST);
    }

    //check if the user a participant of the group course
    if (!is_enrolled(get_context_instance(CONTEXT_COURSE, $group->courseid), $userid)) {
        return false;
    }

    if (groups_is_member($groupid, $userid)) {
        return true;
    }

    $member = new stdClass();
    $member->groupid   = $groupid;
    $member->userid    = $userid;
    $member->timeadded = time();

    $DB->insert_record('groups_members', $member);

    //update group info
    $DB->set_field('groups', 'timemodified', $member->timeadded, array('id'=>$groupid));

    //trigger groups events
    $eventdata = new stdClass();
    $eventdata->groupid = $groupid;
    $eventdata->userid  = $userid;
    events_trigger('groups_member_added', $eventdata);

    return true;
}

function groups_remove_member($grouporid, $userorid) {
    global $DB;

    if (is_object($userorid)) {
        $userid = $userorid->id;
        $user   = $userorid;
    } else {
        $userid = $userorid;
        $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
    }

    if (is_object($grouporid)) {
        $groupid = $grouporid->id;
        $group   = $grouporid;
    } else {
        $groupid = $grouporid;
        $group = $DB->get_record('groups', array('id'=>$groupid), '*', MUST_EXIST);
    }

    if (!groups_is_member($groupid, $userid)) {
        return true;
    }

    $DB->delete_records('groups_members', array('groupid'=>$groupid, 'userid'=>$userid));

    //update group info
    $DB->set_field('groups', 'timemodified', time(), array('id'=>$groupid));

    //trigger groups events
    $eventdata = new stdClass();
    $eventdata->groupid = $groupid;
    $eventdata->userid  = $userid;
    events_trigger('groups_member_removed', $eventdata);

    return true;
}

function groups_create_group($data, $editform = false, $editoroptions = false) {
    global $CFG, $DB;

    //check that courseid exists
    $course = $DB->get_record('course', array('id' => $data->courseid), '*', MUST_EXIST);
    $context = get_context_instance(CONTEXT_COURSE, $course->id);

    $data->timecreated  = time();
    $data->timemodified = $data->timecreated;
    $data->name         = trim($data->name);

    if ($editform and $editoroptions) {
        $data->description = $data->description_editor['text'];
        $data->descriptionformat = $data->description_editor['format'];
    }

    $data->id = $DB->insert_record('groups', $data);

    if ($editform and $editoroptions) {
        // Update description from editor with fixed files
        $data = file_postupdate_standard_editor($data, 'description', $editoroptions, $context, 'group', 'description', $data->id);
        $upd = new stdClass();
        $upd->id                = $data->id;
        $upd->description       = $data->description;
        $upd->descriptionformat = $data->descriptionformat;
        $DB->update_record('groups', $upd);
    }

    $group = $DB->get_record('groups', array('id'=>$data->id));

    if ($editform) {
        groups_update_group_icon($group, $data, $editform);
    }

    //trigger groups events
    events_trigger('groups_group_created', $group);

    return $group->id;
}

function groups_create_grouping($data, $editoroptions=null) {
    global $DB;

    $data->timecreated  = time();
    $data->timemodified = $data->timecreated;
    $data->name         = trim($data->name);

    if ($editoroptions !== null) {
        $data->description = $data->description_editor['text'];
        $data->descriptionformat = $data->description_editor['format'];
    }

    $id = $DB->insert_record('groupings', $data);

    //trigger groups events
    $data->id = $id;

    if ($editoroptions !== null) {
        $description = new stdClass;
        $description->id = $data->id;
        $description->description_editor = $data->description_editor;
        $description = file_postupdate_standard_editor($description, 'description', $editoroptions, $editoroptions['context'], 'grouping', 'description', $description->id);
        $DB->update_record('groupings', $description);
    }

    events_trigger('groups_grouping_created', $data);

    return $id;
}

function groups_update_group_icon($group, $data, $editform) {
    global $CFG, $DB;
    require_once("$CFG->libdir/gdlib.php");

    $fs = get_file_storage();
    $context = get_context_instance(CONTEXT_COURSE, $group->courseid, MUST_EXIST);

    //TODO: it would make sense to allow picture deleting too (skodak)

    if ($iconfile = $editform->save_temp_file('imagefile')) {
        if (process_new_icon($context, 'group', 'icon', $group->id, $iconfile)) {
            $DB->set_field('groups', 'picture', 1, array('id'=>$group->id));
            $group->picture = 1;
        } else {
            $fs->delete_area_files($context->id, 'group', 'icon', $group->id);
            $DB->set_field('groups', 'picture', 0, array('id'=>$group->id));
            $group->picture = 0;
        }
        @unlink($iconfile);
    }
}

function groups_update_group($data, $editform = false, $editoroptions = false) {
    global $CFG, $DB;

    $context = get_context_instance(CONTEXT_COURSE, $data->courseid);

    $data->timemodified = time();
    $data->name         = trim($data->name);

    if ($editform and $editoroptions) {
        $data = file_postupdate_standard_editor($data, 'description', $editoroptions, $context, 'group', 'description', $data->id);
    }

    $DB->update_record('groups', $data);

    $group = $DB->get_record('groups', array('id'=>$data->id));

    if ($editform) {
        groups_update_group_icon($group, $data, $editform);
    }

    //trigger groups events
    events_trigger('groups_group_updated', $group);


    return true;
}

function groups_update_grouping($data, $editoroptions=null) {
    global $DB;
    $data->timemodified = time();
    $data->name         = trim($data->name);
    if ($editoroptions !== null) {
        $data = file_postupdate_standard_editor($data, 'description', $editoroptions, $editoroptions['context'], 'grouping', 'description', $data->id);
    }
    $DB->update_record('groupings', $data);
    //trigger groups events
    events_trigger('groups_grouping_updated', $data);

    return true;
}

function groups_delete_group($grouporid) {
    global $CFG, $DB;
    require_once("$CFG->libdir/gdlib.php");

    if (is_object($grouporid)) {
        $groupid = $grouporid->id;
        $group   = $grouporid;
    } else {
        $groupid = $grouporid;
        if (!$group = $DB->get_record('groups', array('id'=>$groupid))) {
            //silently ignore attempts to delete missing already deleted groups ;-)
            return true;
        }
    }

    // delete group calendar events
    $DB->delete_records('event', array('groupid'=>$groupid));
    //first delete usage in groupings_groups
    $DB->delete_records('groupings_groups', array('groupid'=>$groupid));
    //delete members
    $DB->delete_records('groups_members', array('groupid'=>$groupid));
    //group itself last
    $DB->delete_records('groups', array('id'=>$groupid));

    // Delete all files associated with this group
    $context = get_context_instance(CONTEXT_COURSE, $group->courseid);
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'group', 'description', $groupid);
    $fs->delete_area_files($context->id, 'group', 'icon', $groupid);

    //trigger groups events
    events_trigger('groups_group_deleted', $group);

    return true;
}

function groups_delete_grouping($groupingorid) {
    global $DB;

    if (is_object($groupingorid)) {
        $groupingid = $groupingorid->id;
        $grouping   = $groupingorid;
    } else {
        $groupingid = $groupingorid;
        if (!$grouping = $DB->get_record('groupings', array('id'=>$groupingorid))) {
            //silently ignore attempts to delete missing already deleted groupings ;-)
            return true;
        }
    }

    //first delete usage in groupings_groups
    $DB->delete_records('groupings_groups', array('groupingid'=>$groupingid));
    // remove the default groupingid from course
    $DB->set_field('course', 'defaultgroupingid', 0, array('defaultgroupingid'=>$groupingid));
    // remove the groupingid from all course modules
    $DB->set_field('course_modules', 'groupingid', 0, array('groupingid'=>$groupingid));
    //group itself last
    $DB->delete_records('groupings', array('id'=>$groupingid));

    $context = get_context_instance(CONTEXT_COURSE, $grouping->courseid);
    $fs = get_file_storage();
    $files = $fs->get_area_files($context->id, 'grouping', 'description', $groupingid);
    foreach ($files as $file) {
        $file->delete();
    }

    //trigger groups events
    events_trigger('groups_grouping_deleted', $grouping);

    return true;
}

function groups_delete_group_members($courseid, $userid=0, $showfeedback=false) {
    global $DB, $OUTPUT;

    if (is_bool($userid)) {
        debugging('Incorrect userid function parameter');
        return false;
    }

    $params = array('courseid'=>$courseid);

    if ($userid) {
        $usersql = "AND userid = :userid";
        $params['userid'] = $userid;
    } else {
        $usersql = "";
    }

    $groupssql = "SELECT id FROM {groups} g WHERE g.courseid = :courseid";
    $DB->delete_records_select('groups_members', "groupid IN ($groupssql) $usersql", $params);

    //trigger groups events
    $eventdata = new stdClass();
    $eventdata->courseid = $courseid;
    $eventdata->userid   = $userid;
    events_trigger('groups_members_removed', $eventdata);

    if ($showfeedback) {
        echo $OUTPUT->notification(get_string('deleted').' - '.get_string('groupmembers', 'group'), 'notifysuccess');
    }

    return true;
}

function groups_delete_groupings_groups($courseid, $showfeedback=false) {
    global $DB, $OUTPUT;

    $groupssql = "SELECT id FROM {groups} g WHERE g.courseid = ?";
    $DB->delete_records_select('groupings_groups', "groupid IN ($groupssql)", array($courseid));

    //trigger groups events
    events_trigger('groups_groupings_groups_removed', $courseid);

    // no need to show any feedback here - we delete usually first groupings and then groups

    return true;
}

function groups_delete_groups($courseid, $showfeedback=false) {
    global $CFG, $DB, $OUTPUT;

    // delete any uses of groups
    // Any associated files are deleted as part of groups_delete_groupings_groups
    groups_delete_groupings_groups($courseid, $showfeedback);
    groups_delete_group_members($courseid, 0, $showfeedback);

    // delete group pictures and descriptions
    $context = get_context_instance(CONTEXT_COURSE, $courseid);
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'group');

    // delete group calendar events
    $groupssql = "SELECT id FROM {groups} g WHERE g.courseid = ?";
    $DB->delete_records_select('event', "groupid IN ($groupssql)", array($courseid));

    $context = get_context_instance(CONTEXT_COURSE, $courseid);
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'group');

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

    // trigger groups events
    events_trigger('groups_groups_deleted', $courseid);

    if ($showfeedback) {
        echo $OUTPUT->notification(get_string('deleted').' - '.get_string('groups', 'group'), 'notifysuccess');
    }

    return true;
}

function groups_delete_groupings($courseid, $showfeedback=false) {
    global $DB, $OUTPUT;

    // delete any uses of groupings
    $sql = "DELETE FROM {groupings_groups}
             WHERE groupingid in (SELECT id FROM {groupings} g WHERE g.courseid = ?)";
    $DB->execute($sql, array($courseid));

    // remove the default groupingid from course
    $DB->set_field('course', 'defaultgroupingid', 0, array('id'=>$courseid));
    // remove the groupingid from all course modules
    $DB->set_field('course_modules', 'groupingid', 0, array('course'=>$courseid));

    // Delete all files associated with groupings for this course
    $context = get_context_instance(CONTEXT_COURSE, $courseid);
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'grouping');

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

    // trigger groups events
    events_trigger('groups_groupings_deleted', $courseid);

    if ($showfeedback) {
        echo $OUTPUT->notification(get_string('deleted').' - '.get_string('groupings', 'group'), 'notifysuccess');
    }

    return true;
}

/* =================================== */
/* various functions used by groups UI */
/* =================================== */

function groups_get_possible_roles($context) {
    $roles = get_profile_roles($context);
    return array_keys($roles);
}


function groups_get_potential_members($courseid, $roleid = null, $cohortid = null, $orderby = 'lastname ASC, firstname ASC') {
    global $DB;

    $context = get_context_instance(CONTEXT_COURSE, $courseid);

    // we are looking for all users with this role assigned in this context or higher
    $listofcontexts = get_related_contexts_string($context);

    list($esql, $params) = get_enrolled_sql($context);

    if ($roleid) {
        $params['roleid'] = $roleid;
        $where = "WHERE u.id IN (SELECT userid
                                   FROM {role_assignments}
                                  WHERE roleid = :roleid AND contextid $listofcontexts)";
    } else {
        $where = "";
    }

    if ($cohortid) {
        $cohortjoin = "JOIN {cohort_members} cm ON (cm.userid = u.id AND cm.cohortid = :cohortid)";
        $params['cohortid'] = $cohortid;
    } else {
        $cohortjoin = "";
    }

    $sql = "SELECT u.id, u.username, u.firstname, u.lastname, u.idnumber
              FROM {user} u
              JOIN ($esql) e ON e.id = u.id
       $cohortjoin
            $where
          ORDER BY $orderby";

    return $DB->get_records_sql($sql, $params);

}

function groups_parse_name($format, $groupnumber) {
    if (strstr($format, '@') !== false) { // Convert $groupnumber to a character series
        $letter = 'A';
        for($i=0; $i<$groupnumber; $i++) {
            $letter++;
        }
        $str = str_replace('@', $letter, $format);
    } else {
        $str = str_replace('#', $groupnumber+1, $format);
    }
    return($str);
}

function groups_assign_grouping($groupingid, $groupid) {
    global $DB;

    if ($DB->record_exists('groupings_groups', array('groupingid'=>$groupingid, 'groupid'=>$groupid))) {
        return true;
    }
    $assign = new stdClass();
    $assign->groupingid = $groupingid;
    $assign->groupid    = $groupid;
    $assign->timeadded  = time();
    $DB->insert_record('groupings_groups', $assign);

    return true;
}

function groups_unassign_grouping($groupingid, $groupid) {
    global $DB;
    $DB->delete_records('groupings_groups', array('groupingid'=>$groupingid, 'groupid'=>$groupid));

    return true;
}

function groups_get_members_by_role($groupid, $courseid, $fields='u.*',
        $sort='u.lastname ASC', $extrawheretest='', $whereparams=array()) {
    global $CFG, $DB;

    // Retrieve information about all users and their roles on the course or
    // parent ('related') contexts
    $context = get_context_instance(CONTEXT_COURSE, $courseid);

    if ($extrawheretest) {
        $extrawheretest = ' AND ' . $extrawheretest;
    }

    $sql = "SELECT r.id AS roleid, r.shortname AS roleshortname, r.name AS rolename,
                   u.id AS userid, $fields
              FROM {groups_members} gm
              JOIN {user} u ON u.id = gm.userid
         LEFT JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.contextid ".get_related_contexts_string($context).")
         LEFT JOIN {role} r ON r.id = ra.roleid
             WHERE gm.groupid=:mgroupid
                   ".$extrawheretest."
          ORDER BY r.sortorder, $sort";
    $whereparams['mgroupid'] = $groupid;
    $rs = $DB->get_recordset_sql($sql, $whereparams);

    return groups_calculate_role_people($rs, $context);
}

function groups_calculate_role_people($rs, $context) {
    global $CFG, $DB;

    if (!$rs) {
        return array();
    }

    $roles = $DB->get_records_menu('role', null, 'name', 'id, name');
    $aliasnames = role_fix_names($roles, $context);

    // Array of all involved roles
    $roles = array();
    // Array of all retrieved users
    $users = array();
    // Fill arrays
    foreach ($rs as $rec) {
        // Create information about user if this is a new one
        if (!array_key_exists($rec->userid, $users)) {
            // User data includes all the optional fields, but not any of the
            // stuff we added to get the role details
            $userdata = clone($rec);
            unset($userdata->roleid);
            unset($userdata->roleshortname);
            unset($userdata->rolename);
            unset($userdata->userid);
            $userdata->id = $rec->userid;

            // Make an array to hold the list of roles for this user
            $userdata->roles = array();
            $users[$rec->userid] = $userdata;
        }
        // If user has a role...
        if (!is_null($rec->roleid)) {
            // Create information about role if this is a new one
            if (!array_key_exists($rec->roleid,$roles)) {
                $roledata = new stdClass();
                $roledata->id        = $rec->roleid;
                $roledata->shortname = $rec->roleshortname;
                if (array_key_exists($rec->roleid, $aliasnames)) {
                    $roledata->name = $aliasnames[$rec->roleid];
                } else {
                    $roledata->name = $rec->rolename;
                }
                $roledata->users = array();
                $roles[$roledata->id] = $roledata;
            }
            // Record that user has role
            $users[$rec->userid]->roles[] = $roles[$rec->roleid];
        }
    }
    $rs->close();

    // Return false if there weren't any users
    if (count($users) == 0) {
        return false;
    }

    // Add pseudo-role for multiple roles
    $roledata = new stdClass();
    $roledata->name = get_string('multipleroles','role');
    $roledata->users = array();
    $roles['*'] = $roledata;

    $roledata = new stdClass();
    $roledata->name = get_string('noroles','role');
    $roledata->users = array();
    $roles[0] = $roledata;

    // Now we rearrange the data to store users by role
    foreach ($users as $userid=>$userdata) {
        $rolecount = count($userdata->roles);
        if ($rolecount == 0) {
            // does not have any roles
            $roleid = 0;
        } else if($rolecount > 1) {
            $roleid = '*';
        } else {
            $roleid = $userdata->roles[0]->id;
        }
        $roles[$roleid]->users[$userid] = $userdata;
    }

    // Delete roles not used
    foreach ($roles as $key=>$roledata) {
        if (count($roledata->users)===0) {
            unset($roles[$key]);
        }
    }

    // Return list of roles containing their users
    return $roles;
}