/**
* Attempt to import the FormFilter class file if it isn't already imported.
* You can use this method outside of Form for loading a filter for inheritance or composition.
*
* @param string $type Type of a filter whose class should be loaded.
*
* @return string|boolean Class name on success or false otherwise.
*
* @since 4.0.0
*/
public static function loadFilterClass($type)
{
return self::loadClass('filter', $type);
}