/**
* Generate Student ID. year(2) + month(2) + day(2) + serial(4): 1204050027
*/
protected function generateStudentId()
{
$time = date('ymd');
$cond['id'] = array('LIKE', "{$time}%");
$number = DBModel::countByCond('cernet_user', $cond);
$number++;
$number = '' . $number;
while (strlen($number) < 4) {
$number = '0' . $number;
}
return $time . $number;
}