Cacher is the code snippet organizer for pro developers

function limit_text($text, $limit) {
  if (str_word_count($text, 0) > $limit) {
      $words = str_word_count($text, 2);
      $pos = array_keys($words);
      $text = substr($text, 0, $pos[$limit]) . '…';
  }
  return $text;
}

echo limit_text(get_the_excerpt(), 30);