Membuat Breadcrumb Navigation untuk Melengkapi Rich Snippet di Wordpress

Yang disediakan adalah sebuah fungsi yang diletakan di functions.php, disini saya copas dari dimox_breadcrumbs

 
function dimox_breadcrumbs() {

 /* === OPTIONS === */
 $text['home'] = 'Home'; // text for the 'Home' link
 $text['category'] = 'Archive by Category "%s"'; // text for a category page
 $text['search'] = 'Search Results for "%s" Query'; // text for a search results page
 $text['tag'] = 'Posts Tagged "%s"'; // text for a tag page
 $text['author'] = 'Articles Posted by %s'; // text for an author page
 $text['404'] = 'Error 404'; // text for the 404 page

 $show_current = 1; // 1 - show current post/page/category title in breadcrumbs, 0 - don't show
 $show_on_home = 0; // 1 - show breadcrumbs on the homepage, 0 - don't show
 $show_home_link = 1; // 1 - show the 'Home' link, 0 - don't show
 $show_title = 1; // 1 - show the title for the links, 0 - don't show
 $delimiter = ' » '; // delimiter between crumbs
 $before = '<span class="current">'; // tag before the current crumb
 $after = '</span>'; // tag after the current crumb
 /* === END OF OPTIONS === */

 global $post;
 $home_link = home_url('/');
 $link_before = '<span typeof="v:Breadcrumb">';
 $link_after = '</span>';
 $link_attr = ' rel="v:url" property="v:title"';
 $link = $link_before . '<a' . $link_attr . ' href="%1$s">%2$s</a>' . $link_after;
 $parent_id = $parent_id_2 = $post->post_parent;
 $frontpage_id = get_option('page_on_front');

 if (is_home() || is_front_page()) {

 if ($show_on_home == 1) echo '<div class="breadcrumbs"><a href="' . $home_link . '">' . $text['home'] . '</a></div>';

 } else {

 echo '<div class="breadcrumbs" xmlns:v="http://rdf.data-vocabulary.org/#">';
 if ($show_home_link == 1) {
 echo '<a href="' . $home_link . '" rel="v:url" property="v:title">' . $text['home'] . '</a>';
 if ($frontpage_id == 0 || $parent_id != $frontpage_id) echo $delimiter;
 }

 if ( is_category() ) {
 $this_cat = get_category(get_query_var('cat'), false);
 if ($this_cat->parent != 0) {
 $cats = get_category_parents($this_cat->parent, TRUE, $delimiter);
 if ($show_current == 0) $cats = preg_replace("#^(.+)$delimiter$#", "$1", $cats);
 $cats = str_replace('<a', $link_before . '<a' . $link_attr, $cats);
 $cats = str_replace('</a>', '</a>' . $link_after, $cats);
 if ($show_title == 0) $cats = preg_replace('/ title="(.*?)"/', '', $cats);
 echo $cats;
 }
 if ($show_current == 1) echo $before . sprintf($text['category'], single_cat_title('', false)) . $after;

 } elseif ( is_search() ) {
 echo $before . sprintf($text['search'], get_search_query()) . $after;

 } elseif ( is_day() ) {
 echo sprintf($link, get_year_link(get_the_time('Y')), get_the_time('Y')) . $delimiter;
 echo sprintf($link, get_month_link(get_the_time('Y'),get_the_time('m')), get_the_time('F')) . $delimiter;
 echo $before . get_the_time('d') . $after;

 } elseif ( is_month() ) {
 echo sprintf($link, get_year_link(get_the_time('Y')), get_the_time('Y')) . $delimiter;
 echo $before . get_the_time('F') . $after;

 } elseif ( is_year() ) {
 echo $before . get_the_time('Y') . $after;

 } elseif ( is_single() && !is_attachment() ) {
 if ( get_post_type() != 'post' ) {
 $post_type = get_post_type_object(get_post_type());
 $slug = $post_type->rewrite;
 printf($link, $home_link . $slug['slug'] . '/', $post_type->labels->singular_name);
 if ($show_current == 1) echo $delimiter . $before . get_the_title() . $after;
 } else {
 $cat = get_the_category(); $cat = $cat[0];
 $cats = get_category_parents($cat, TRUE, $delimiter);
 if ($show_current == 0) $cats = preg_replace("#^(.+)$delimiter$#", "$1", $cats);
 $cats = str_replace('<a', $link_before . '<a' . $link_attr, $cats);
 $cats = str_replace('</a>', '</a>' . $link_after, $cats);
 if ($show_title == 0) $cats = preg_replace('/ title="(.*?)"/', '', $cats);
 echo $cats;
 if ($show_current == 1) echo $before . get_the_title() . $after;
 }

 } elseif ( !is_single() && !is_page() && get_post_type() != 'post' && !is_404() ) {
 $post_type = get_post_type_object(get_post_type());
 echo $before . $post_type->labels->singular_name . $after;

 } elseif ( is_attachment() ) {
 $parent = get_post($parent_id);
 $cat = get_the_category($parent->ID); $cat = $cat[0];
 if ($cat) {
 $cats = get_category_parents($cat, TRUE, $delimiter);
 $cats = str_replace('<a', $link_before . '<a' . $link_attr, $cats);
 $cats = str_replace('</a>', '</a>' . $link_after, $cats);
 if ($show_title == 0) $cats = preg_replace('/ title="(.*?)"/', '', $cats);
 echo $cats;
 }
 printf($link, get_permalink($parent), $parent->post_title);
 if ($show_current == 1) echo $delimiter . $before . get_the_title() . $after;

 } elseif ( is_page() && !$parent_id ) {
 if ($show_current == 1) echo $before . get_the_title() . $after;

 } elseif ( is_page() && $parent_id ) {
 if ($parent_id != $frontpage_id) {
 $breadcrumbs = array();
 while ($parent_id) {
 $page = get_page($parent_id);
 if ($parent_id != $frontpage_id) {
 $breadcrumbs[] = sprintf($link, get_permalink($page->ID), get_the_title($page->ID));
 }
 $parent_id = $page->post_parent;
 }
 $breadcrumbs = array_reverse($breadcrumbs);
 for ($i = 0; $i < count($breadcrumbs); $i++) {
 echo $breadcrumbs[$i];
 if ($i != count($breadcrumbs)-1) echo $delimiter;
 }
 }
 if ($show_current == 1) {
 if ($show_home_link == 1 || ($parent_id_2 != 0 && $parent_id_2 != $frontpage_id)) echo $delimiter;
 echo $before . get_the_title() . $after;
 }

 } elseif ( is_tag() ) {
 echo $before . sprintf($text['tag'], single_tag_title('', false)) . $after;

 } elseif ( is_author() ) {
 global $author;
 $userdata = get_userdata($author);
 echo $before . sprintf($text['author'], $userdata->display_name) . $after;

 } elseif ( is_404() ) {
 echo $before . $text['404'] . $after;

 } elseif ( has_post_format() && !is_singular() ) {
 echo get_post_format_string( get_post_format() );
 }

 if ( get_query_var('paged') ) {
 if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ' (';
 echo __('Page') . ' ' . get_query_var('paged');
 if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ')';
 }

 echo '</div><!-- .breadcrumbs -->';

 }
} // end dimox_breadcrumbs()

Penggunananya tinggal panggil fungsi dimox_breadcrumbs() di header.php