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<?php
/**
 * Argument handler to accept multiple file ids.
 *
 * @ingroup views_argument_handlers
 */
class views_handler_argument_file_fid extends views_handler_argument_numeric {
  /**
   * Override the behavior of title_query(). Get the filenames.
   */
  function title_query() {
    $titles = db_select('file_managed', 'f')
      ->fields('f', array('filename'))
      ->condition('fid', $this->value)
      ->execute()
      ->fetchCol();
    foreach ($titles as &$title) {
      $title = check_plain($title);
    }
    return $titles;
  }
}