foreach ($contacts as $cid) {
$cdata = Contact::getPublicAndUserContactID($cid, $group['uid']);
if (empty($cdata['user'])) {
throw new HTTPException\NotFoundException('Invalid contact.');
}
foreach ($contacts as $cid) {
$cdata = Contact::getPublicAndUserContactID($cid, $group['uid']);
if (empty($cdata['user'])) {
throw new HTTPException\NotFoundException('Invalid contact.');
}