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

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<?php
require_once('../config.php');
require_once('lib.php');

$courseid = required_param('id', PARAM_INT);
$groupid  = optional_param('group', false, PARAM_INT);
$userid   = optional_param('user', false, PARAM_INT);
$action   = groups_param_action();
// Support either single group= parameter, or array groups[]
if ($groupid) {
    $groupids = array($groupid);
} else {
    $groupids = optional_param_array('groups', array(), PARAM_INT);
}
$singlegroup = (count($groupids) == 1);

$returnurl = $CFG->wwwroot.'/group/index.php?id='.$courseid;

// Get the course information so we can print the header and
// check the course id is valid

$course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);

$url = new moodle_url('/group/index.php', array('id'=>$courseid));
if ($userid) {
    $url->param('user', $userid);
}
if ($groupid) {
    $url->param('group', $groupid);
}
$PAGE->set_url($url);

// Make sure that the user has permissions to manage groups.
require_login($course);

$PAGE->requires->yui2_lib('connection');
$PAGE->requires->js('/group/clientlib.js');

$context = get_context_instance(CONTEXT_COURSE, $course->id);
if (!has_capability('moodle/course:managegroups', $context)) {
    redirect('/course/view.php', array('id'=>$course->id)); // Not allowed to manage all groups
}

// Check for multiple/no group errors
if (!$singlegroup) {
    switch($action) {
        case 'ajax_getmembersingroup':
        case 'showgroupsettingsform':
        case 'showaddmembersform':
        case 'updatemembers':
            print_error('errorselectone', 'group', $returnurl);
    }
}

switch ($action) {
    case false: //OK, display form.
        break;

    case 'ajax_getmembersingroup':
        $roles = array();
        if ($groupmemberroles = groups_get_members_by_role($groupids[0], $courseid, 'u.id,u.firstname,u.lastname')) {
            foreach($groupmemberroles as $roleid=>$roledata) {
                $shortroledata = new stdClass();
                $shortroledata->name = $roledata->name;
                $shortroledata->users = array();
                foreach($roledata->users as $member) {
                    $shortmember = new stdClass();
                    $shortmember->id = $member->id;
                    $shortmember->name = fullname($member, true);
                    $shortroledata->users[] = $shortmember;
                }
                $roles[] = $shortroledata;
            }
        }
        echo json_encode($roles);
        die;  // Client side JavaScript takes it from here.

    case 'deletegroup':
        if (count($groupids) == 0) {
            print_error('errorselectsome','group',$returnurl);
        }
        $groupidlist = implode(',', $groupids);
        redirect(new moodle_url('/group/delete.php', array('courseid'=>$courseid, 'groups'=>$groupidlist)));
        break;

    case 'showcreateorphangroupform':
        redirect(new moodle_url('/group/group.php', array('courseid'=>$courseid)));
        break;

    case 'showautocreategroupsform':
        redirect(new moodle_url('/group/autogroup.php', array('courseid'=>$courseid)));
        break;

    case 'showimportgroups':
        redirect(new moodle_url('/group/import.php', array('id'=>$courseid)));
        break;

    case 'showgroupsettingsform':
        redirect(new moodle_url('/group/group.php', array('courseid'=>$courseid, 'id'=>$groupids[0])));
        break;

    case 'updategroups': //Currently reloading.
        break;

    case 'removemembers':
        break;

    case 'showaddmembersform':
        redirect(new moodle_url('/group/members.php', array('group'=>$groupids[0])));
        break;

    case 'updatemembers': //Currently reloading.
        break;

    default: //ERROR.
        print_error('unknowaction', '', $returnurl);
        break;
}

// Print the page and form
$strgroups = get_string('groups');
$strparticipants = get_string('participants');

$PAGE->set_title($strgroups);
$PAGE->set_heading($course->fullname);
$PAGE->set_pagelayout('standard');
echo $OUTPUT->header();

// Add tabs
$currenttab = 'groups';
require('tabs.php');

$disabled = 'disabled="disabled"';
if (ajaxenabled()) {
    // Some buttons are enabled if single group selected
    $showaddmembersform_disabled = $singlegroup ? '' : $disabled;
    $showeditgroupsettingsform_disabled = $singlegroup ? '' : $disabled;
    $deletegroup_disabled = count($groupids)>0 ? '' : $disabled;
} else {
    // Do not disable buttons. The buttons work based on the selected group,
    // which you can change without reloading the page, so it is not appropriate
    // to disable them if no group is selected.
    $showaddmembersform_disabled = '';
    $showeditgroupsettingsform_disabled = '';
    $deletegroup_disabled = '';
}

echo $OUTPUT->heading(format_string($course->shortname, true, array('context' => $context)) .' '.$strgroups, 3);
echo '<form id="groupeditform" action="index.php" method="post">'."\n";
echo '<div>'."\n";
echo '<input type="hidden" name="id" value="' . $courseid . '" />'."\n";

echo '<table cellpadding="6" class="generaltable generalbox groupmanagementtable boxaligncenter" summary="">'."\n";
echo '<tr>'."\n";


echo "<td>\n";
echo '<p><label for="groups"><span id="groupslabel">'.get_string('groups').':</span><span id="thegrouping">&nbsp;</span></label></p>'."\n";

if (ajaxenabled()) { // TODO: move this to JS init!
    $onchange = 'M.core_group.membersCombo.refreshMembers();';
} else {
    $onchange = '';
}

echo '<select name="groups[]" multiple="multiple" id="groups" size="15" class="select" onchange="'.$onchange.'"'."\n";
echo ' onclick="window.status=this.selectedIndex==-1 ? \'\' : this.options[this.selectedIndex].title;" onmouseout="window.status=\'\';">'."\n";

$groups = groups_get_all_groups($courseid);
$selectedname = '&nbsp;';

if ($groups) {
    // Print out the HTML
    foreach ($groups as $group) {
        $select = '';
        $usercount = $DB->count_records('groups_members', array('groupid'=>$group->id));
        $groupname = format_string($group->name).' ('.$usercount.')';
        if (in_array($group->id,$groupids)) {
            $select = ' selected="selected"';
            if ($singlegroup) {
                // Only keep selected name if there is one group selected
                $selectedname = $groupname;
            }
        }

        echo "<option value=\"{$group->id}\"$select title=\"$groupname\">$groupname</option>\n";
    }
} else {
    // Print an empty option to avoid the XHTML error of having an empty select element
    echo '<option>&nbsp;</option>';
}

echo '</select>'."\n";
echo '<p><input type="submit" name="act_updatemembers" id="updatemembers" value="'
        . get_string('showmembersforgroup', 'group') . '" /></p>'."\n";
echo '<p><input type="submit" '. $showeditgroupsettingsform_disabled . ' name="act_showgroupsettingsform" id="showeditgroupsettingsform" value="'
        . get_string('editgroupsettings', 'group') . '" /></p>'."\n";
echo '<p><input type="submit" '. $deletegroup_disabled . ' name="act_deletegroup" onclick="onDeleteGroup()" id="deletegroup" value="'
        . get_string('deleteselectedgroup', 'group') . '" /></p>'."\n";

echo '<p><input type="submit" name="act_showcreateorphangroupform" id="showcreateorphangroupform" value="'
        . get_string('creategroup', 'group') . '" /></p>'."\n";

echo '<p><input type="submit" name="act_showautocreategroupsform" id="showautocreategroupsform" value="'
        . get_string('autocreategroups', 'group') . '" /></p>'."\n";

echo '<p><input type="submit" name="act_showimportgroups" id="showimportgroups" value="'
        . get_string('importgroups', 'core_group') . '" /></p>'."\n";

echo '</td>'."\n";
echo '<td>'."\n";

echo '<p><label for="members"><span id="memberslabel">'.
    get_string('membersofselectedgroup', 'group').
    ' </span><span id="thegroup">'.$selectedname.'</span></label></p>'."\n";
//NOTE: the SELECT was, multiple="multiple" name="user[]" - not used and breaks onclick.
echo '<select name="user" id="members" size="15" class="select"'."\n";
echo ' onclick="window.status=this.options[this.selectedIndex].title;" onmouseout="window.status=\'\';">'."\n";

$member_names = array();

$atleastonemember = false;
if ($singlegroup) {
    if ($groupmemberroles = groups_get_members_by_role($groupids[0],$courseid,'u.id,u.firstname,u.lastname')) {
        foreach($groupmemberroles as $roleid=>$roledata) {
            echo '<optgroup label="'.s($roledata->name).'">';
            foreach($roledata->users as $member) {
                echo '<option value="'.$member->id.'">'.fullname($member, true).'</option>';
                $atleastonemember = true;
            }
            echo '</optgroup>';
        }
    }
}

if (!$atleastonemember) {
    // Print an empty option to avoid the XHTML error of having an empty select element
    echo '<option>&nbsp;</option>';
}

echo '</select>'."\n";

echo '<p><input type="submit" ' . $showaddmembersform_disabled . ' name="act_showaddmembersform" '
        . 'id="showaddmembersform" value="' . get_string('adduserstogroup', 'group'). '" /></p>'."\n";
echo '</td>'."\n";
echo '</tr>'."\n";
echo '</table>'."\n";

//<input type="hidden" name="rand" value="om" />
echo '</div>'."\n";
echo '</form>'."\n";

if (ajaxenabled()) {
    $PAGE->requires->js_init_call('M.core_group.init_index', array($CFG->wwwroot, $courseid));
}

echo $OUTPUT->footer();

function groups_param_action($prefix = 'act_') {
    $action = false;
//($_SERVER['QUERY_STRING'] && preg_match("/$prefix(.+?)=(.+)/", $_SERVER['QUERY_STRING'], $matches)) { //b_(.*?)[&;]{0,1}/

    if ($_POST) {
        $form_vars = $_POST;
    }
    elseif ($_GET) {
        $form_vars = $_GET;
    }
    if ($form_vars) {
        foreach ($form_vars as $key => $value) {
            if (preg_match("/$prefix(.+)/", $key, $matches)) {
                $action = $matches[1];
                break;
            }
        }
    }
    if ($action && !preg_match('/^\w+$/', $action)) {
        $action = false;
        print_error('unknowaction');
    }
    return $action;
}