Get tags as commas list

tag-comma-list.php

  <?php
  // post tags
  $posttags = get_the_tags();
  if ($posttags) {
    $taglist = ""; ?>
    <ul class="tags">
    <div class="title">Tags</div>
    <?php foreach($posttags as $tag) {
      $taglist .=  '<a href="'. get_tag_link($tag->term_id) .'">' . $tag->name . '</a>, ';
    } echo rtrim($taglist, ", "); } ?>
  </ul>