history_read_multiple

history_read_multiple($nids)

function history_read_multiple($nids) {
  $history = &drupal_static(__FUNCTION__, array());

  $return = array();

  $nodes_to_read = array();
  foreach ($nids as $nid) {
    if (isset($history[$nid])) {
      $return[$nid] = $history[$nid];
    }
    else {
      // Initialize value if current user has not viewed the node.
      $nodes_to_read[$nid] = 0;
    }
  }

  if (empty($nodes_to_read)) {
    return $return;
  }

  $result = db_query('SELECT nid, timestamp FROM {history} WHERE uid = :uid AND nid IN ( :nids[] )', array(
    ':uid' => \Drupal::currentUser()->id(),
    ':nids[]' => array_keys($nodes_to_read),
  ));
  foreach ($result as $row) {
    $nodes_to_read[$row->nid] = (int) $row->timestamp;
  }
  $history += $nodes_to_read;

  return $return + $nodes_to_read;
}