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function get_abbreviated_title($post_id, $num_char = 20, $ellips = '…') {
  $title = get_the_title($post_id);
  if ( mb_strlen($title, 'UTF-8') > $num_char ) {
    $title = mb_substr($title, 0, $num_char, 'UTF-8') . $ellips;
  }
  return $title;
}