/**
  * @param string $feature_type
  * @param array $feature_args
  *
  * @return null|WP_Field_Feature_Base
  */
 function make_field_feature($feature_type, $feature_args)
 {
     if ($feature_class = WP_Metadata::get_feature_type($feature_type)) {
         $feature = new $feature_class($this, $feature_args);
     } else {
         $feature = null;
     }
     return $feature;
 }