public function add_field($id, $type, array $args, $callback = null)
{
$current_section = $this->current_section;
if (empty($current_section)) {
throw new \Exception("OPTBOX > Section empty.");
}
array_push($this->sections[$current_section]['fields'], $id);
return parent::add_field($id, $type, $args, $callback);
}
