modules/node/views_handler_argument_node_nid.inc

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<?php
class views_handler_argument_node_nid extends views_handler_argument_numeric {
  function title_query() {
    $titles = array();

    $result = db_query("SELECT n.title FROM {node} n WHERE n.nid IN (:nids)", array(':nids' => $this->value));
    foreach ($result as $term) {
      $titles[] = check_plain($term->title);
    }
    return $titles;
  }
}