Club Drupal

    // Ensure integer entity IDs are valid.

    if (!empty($ids)) {

      $this->cleanIds($ids);

    }

  /**

   * Ensures integer entity IDs are valid.

   *

   * The identifier sanitization provided by this method has been introduced

   * as Drupal used to rely on the database to facilitate this, which worked

   * correctly with MySQL but led to errors with other DBMS such as PostgreSQL.

   *

   * @param array $ids

   *   The entity IDs to verify. Non-integer IDs are removed from this array if

   *   the entity type requires IDs to be integers.

   */

  protected function cleanIds(&$ids) {

    $entity_info = entity_get_info($this->entityType);

    if (isset($entity_info['base table field types'])) {

      $id_type = $entity_info['base table field types'][$this->idKey];

      if ($id_type == 'serial' || $id_type == 'int') {

        $ids = array_filter($ids, array($this, 'filterId'));

        $ids = array_map('intval', $ids);

      }

    }

  }

  /**

   * Callback for array_filter that removes non-integer IDs.

   */

  protected function filterId($id) {

    return is_numeric($id) && $id == (int) $id;

  }