getFieldKeyAlias example

// Otherwise, get rendered field.       else {
        // Advanced render for token replacement.         $markup = $field->advancedRender($row);
        // Post render to support uncacheable fields.         $field->postRender($row, $markup);
        $value = $field->last_render;
      }

      // Omit excluded fields from the rendered output.       if (empty($field->options['exclude'])) {
        $output[$this->getFieldKeyAlias($id)] = $value;
      }
    }

    return $output;
  }

  /** * Return an alias for a field ID, as set in the options form. * * @param string $id * The field id to lookup an alias for. * * @return string * The matches user entered alias, or the original ID if nothing is found. */