function validation($data, $files)
{
global $CFG, $COURSE;
$errors = parent::validation($data, $files);
if ($data['allocateby'] != 'no') {
if (!($users = groups_get_potential_members($data['courseid'], $data['roleid']))) {
$errors['roleid'] = get_string('nousersinrole', 'group');
}
/// Check the number entered is sane
if ($data['groupby'] == 'groups') {
$usercnt = count($users);
if ($data['number'] > $usercnt || $data['number'] < 1) {
$errors['number'] = get_string('toomanygroups', 'group', $usercnt);
}
}
}
//try to detect group name duplicates
$name = groups_parse_name(stripslashes(trim($data['namingscheme'])), 0);
if (groups_get_group_by_name($COURSE->id, $name)) {
$errors['namingscheme'] = get_string('groupnameexists', 'group', $name);
}
// check grouping name duplicates
if (isset($data['grouping']) && $data['grouping'] == '-1') {
$name = trim(stripslashes($data['groupingname']));
if (empty($name)) {
$errors['groupingname'] = get_string('required');
} else {
if (groups_get_grouping_by_name($COURSE->id, $name)) {
$errors['groupingname'] = get_string('groupingnameexists', 'group', $name);
}
}
}
/// Check the naming scheme
$matchcnt = preg_match_all('/[#@]{1,1}/', $data['namingscheme'], $matches);
if ($matchcnt != 1) {
$errors['namingscheme'] = get_string('badnamingscheme', 'group');
}
return $errors;
}
/**
* Performs validation of the form information
*
* @param array $data
* @param array $files
* @return array $errors An array of $errors
*/
function validation($data, $files) {
global $CFG, $COURSE;
$errors = parent::validation($data, $files);
if ($data['allocateby'] != 'no') {
$source = array();
if ($data['cohortid']) {
$source['cohortid'] = $data['cohortid'];
}
if ($data['groupingid']) {
$source['groupingid'] = $data['groupingid'];
}
if ($data['groupid']) {
$source['groupid'] = $data['groupid'];
}
if (!$users = groups_get_potential_members($data['courseid'], $data['roleid'], $source)) {
$errors['roleid'] = get_string('nousersinrole', 'group');
}
/// Check the number entered is sane
if ($data['groupby'] == 'groups') {
$usercnt = count($users);
if ($data['number'] > $usercnt || $data['number'] < 1) {
$errors['number'] = get_string('toomanygroups', 'group', $usercnt);
}
}
}
//try to detect group name duplicates
$name = groups_parse_name(trim($data['namingscheme']), 0);
if (groups_get_group_by_name($COURSE->id, $name)) {
$errors['namingscheme'] = get_string('groupnameexists', 'group', $name);
}
// check grouping name duplicates
if ( isset($data['grouping']) && $data['grouping'] == '-1') {
$name = trim($data['groupingname']);
if (empty($name)) {
$errors['groupingname'] = get_string('required');
} else if (groups_get_grouping_by_name($COURSE->id, $name)) {
$errors['groupingname'] = get_string('groupingnameexists', 'group', $name);
}
}
/// Check the naming scheme
if ($data['groupby'] == 'groups' and $data['number'] == 1) {
// we can use the name as is because there will be only one group max
} else {
$matchcnt = preg_match_all('/[#@]{1,1}/', $data['namingscheme'], $matches);
if ($matchcnt != 1) {
$errors['namingscheme'] = get_string('badnamingscheme', 'group');
}
}
return $errors;
}
$numgrps = ceil($usercnt / $data->number);
$userpergrp = $data->number;
if (!empty($data->nosmallgroups) and $usercnt % $data->number != 0) {
// If there would be one group with a small number of member reduce the number of groups
$missing = $userpergrp * $numgrps - $usercnt;
if ($missing > $userpergrp * (1 - AUTOGROUP_MIN_RATIO)) {
// spread the users from the last small group
$numgrps--;
$userpergrp = floor($usercnt / $numgrps);
}
}
}
// allocate the users - all groups equal count first
for ($i = 0; $i < $numgrps; $i++) {
$groups[$i] = array();
$groups[$i]['name'] = groups_parse_name(trim($data->namingscheme), $i);
$groups[$i]['members'] = array();
if ($data->allocateby == 'no') {
continue;
// do not allocate users
}
for ($j = 0; $j < $userpergrp; $j++) {
if (empty($users)) {
break 2;
}
$user = array_shift($users);
$groups[$i]['members'][$user->id] = $user;
}
}
// now distribute the rest
if ($data->allocateby != 'no') {
shuffle($users);
}
$groups = array();
$i = 0;
$cnt = 0;
if ($data->groupby == 'groups') {
$numgrps = $data->number;
$userpergrp = ceil($usercnt / $numgrps);
} else {
$numgrps = ceil($data->number / $usercnt);
$userpergrp = $data->number;
}
foreach ($users as $id => $user) {
if (!isset($groups[$i])) {
// Create a new group
$groups[$i]['name'] = groups_parse_name($data->namingschemegrp['namingscheme'], $i);
}
@($groups[$i]['members'][] =& $users[$id]);
$cnt++;
if ($cnt == $userpergrp) {
$cnt = 0;
$i++;
}
}
if (isset($data->preview)) {
/// Print the groups preview
$preview = '<ul>';
foreach ($groups as $group) {
$preview .= "<li>{$group['name']}\n<ul>";
foreach ($group['members'] as $member) {
$preview .= '<li>' . fullname($member) . '</li>';