Retrieves all filter types that are used in a given text format.
string $format_id: A text format ID.
array All filter types used by filters of a given text format.
Exception
function filter_get_filter_types_by_format($format_id) {
$filter_types = array();
$filters = filter_list_format($format_id);
foreach ($filters as $filter) {
if ($filter->status) {
$filter_types[] = $filter
->getType();
}
}
return array_unique($filter_types);
}