面包屑导航对于一个网站SEO来说还是挺重要的,可以使用以下代码来给自己的主题添加面包屑,将以下代码加入到主题的functions.php里:

function MBThemes_breadcrumbs() {
 /* === OPTIONS === */
 $text[\'home\'] = \'首页\'; 
 $text[\'category\'] = \'%s\'; 
 $text[\'search\'] = \'搜索结果:%s\'; 
 $text[\'tag\'] = \'标签:%s\'; 
 $text[\'author\'] = \'作者:%s\'; 
 $text[\'404\'] = \'404\'; 
 $text[\'page\'] = \'%s\'; 
 $text[\'cpage\'] = \'%s\'; 
 $wrap_before = \'<div >\'; 
 $wrap_after = \'</div>\'; 
 $sep = \'>\'; 
 $sep_before = \'<span >\'; 
 $sep_after = \'</span>\'; 
 $show_home_link = 1; 
 $show_on_home = 0; 
 $show_current = 1;
 $before = \'<span >\'; 
 $after = \'</span>\';
 /* === END OF OPTIONS === */
 global $post;
 $home_link = home_url(\'/\');
 $link_before = \'<span itemscope itemtype=\"http://data-vocabulary.org/Breadcrumb\">\';
 $link_after = \'</span>\';
 $link_attr = \' itemprop=\"url\"\';
 $link_in_before = \'<span itemprop=\"title\">\';
 $link_in_after = \'</span>\';
 $link = $link_before . \'<a href=\"%1$s\"\' . $link_attr . \'>\' . $link_in_before . \'%2$s\' . $link_in_after . \'</a>\' . $link_after;
 $frontpage_id = get_option(\'page_on_front\');
 $parent_id = $post->post_parent;
 $sep = \' \' . $sep_before . $sep . $sep_after . \' \';
 if (is_home() || is_front_page()) {
 if ($show_on_home) echo $wrap_before . \'<a href=\"\' . $home_link . \'\">\' . $text[\'home\'] . \'</a>\' . $wrap_after;
 } else {
 echo $wrap_before;
 if ($show_home_link) echo sprintf($link, $home_link, $text[\'home\']);
 if ( is_category() ) {
 $cat = get_category(get_query_var(\'cat\'), false);
 if ($cat->parent != 0) {
 $cats = get_category_parents($cat->parent, TRUE, $sep);
 $cats = preg_replace(\"#^(.+)$sep$#\", \"$1\", $cats);
 $cats = preg_replace(\'#<a([^>]+)>([^<]+)<\\/a>#\', $link_before . \'<a$1\' . $link_attr .\'>\' . $link_in_before . \'$2\' . $link_in_after .\'</a>\' . $link_after, $cats);
 if ($show_home_link) echo $sep;
 echo $cats;
 }
 if ( get_query_var(\'paged\') ) {
 $cat = $cat->cat_ID;
 echo $sep . sprintf($link, get_category_link($cat), get_cat_name($cat)) . $sep . $before . sprintf($text[\'page\'], get_query_var(\'paged\')) . $after;
 } else {
 if ($show_current) echo $sep . $before . sprintf($text[\'category\'], single_cat_title(\'\', false)) . $after;
 }
 } elseif ( is_search() ) {
 if (have_posts()) {
 if ($show_home_link && $show_current) echo $sep;
 if ($show_current) echo $before . sprintf($text[\'search\'], get_search_query()) . $after;
 } else {
 if ($show_home_link) echo $sep;
 echo $before . sprintf($text[\'search\'], get_search_query()) . $after;
 }
 } elseif ( is_day() ) {
 if ($show_home_link) echo $sep;
 echo sprintf($link, get_year_link(get_the_time(\'Y\')), get_the_time(\'Y\')) . $sep;
 echo sprintf($link, get_month_link(get_the_time(\'Y\'), get_the_time(\'m\')), get_the_time(\'F\'));
 if ($show_current) echo $sep . $before . get_the_time(\'d\') . $after;
 } elseif ( is_month() ) {
 if ($show_home_link) echo $sep;
 echo sprintf($link, get_year_link(get_the_time(\'Y\')), get_the_time(\'Y\'));
 if ($show_current) echo $sep . $before . get_the_time(\'F\') . $after;
 } elseif ( is_year() ) {
 if ($show_home_link && $show_current) echo $sep;
 if ($show_current) echo $before . get_the_time(\'Y\') . $after;
 } elseif ( is_single() && !is_attachment() ) {
 if ($show_home_link) echo $sep;
 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) echo $sep . $before . get_the_title() . $after;
 } else {
 $cat = get_the_category(); $cat = $cat[0];
 $cats = get_category_parents($cat, TRUE, $sep);
 if (!$show_current || get_query_var(\'cpage\')) $cats = preg_replace(\"#^(.+)$sep$#\", \"$1\", $cats);
 $cats = preg_replace(\'#<a([^>]+)>([^<]+)<\\/a>#\', $link_before . \'<a$1\' . $link_attr .\'>\' . $link_in_before . \'$2\' . $link_in_after .\'</a>\' . $link_after, $cats);
 echo $cats;
 if ( get_query_var(\'cpage\') ) {
 echo $sep . sprintf($link, get_permalink(), get_the_title()) . $sep . $before . sprintf($text[\'cpage\'], get_query_var(\'cpage\')) . $after;
 } else {
 if ($show_current) echo $before . get_the_title() . $after;
 }
 }
 // custom post type
 } elseif ( !is_single() && !is_page() && get_post_type() != \'post\' && !is_404() ) {
 $post_type = get_post_type_object(get_post_type());
 if ( get_query_var(\'paged\') ) {
 echo $sep . sprintf($link, get_post_type_archive_link($post_type->name), $post_type->label) . $sep . $before . sprintf($text[\'page\'], get_query_var(\'paged\')) . $after;
 } else {
 if ($show_current) echo $sep . $before . $post_type->label . $after;
 }
 } elseif ( is_attachment() ) {
 if ($show_home_link) echo $sep;
 $parent = get_post($parent_id);
 $cat = get_the_category($parent->ID); $cat = $cat[0];
 if ($cat) {
 $cats = get_category_parents($cat, TRUE, $sep);
 $cats = preg_replace(\'#<a([^>]+)>([^<]+)<\\/a>#\', $link_before . \'<a$1\' . $link_attr .\'>\' . $link_in_before . \'$2\' . $link_in_after .\'</a>\' . $link_after, $cats);
 echo $cats;
 }
 printf($link, get_permalink($parent), $parent->post_title);
 if ($show_current) echo $sep . $before . get_the_title() . $after;
 } elseif ( is_page() && !$parent_id ) {
 if ($show_current) echo $sep . $before . get_the_title() . $after;
 } elseif ( is_page() && $parent_id ) {
 if ($show_home_link) echo $sep;
 if ($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 $sep;
 }
 }
 if ($show_current) echo $sep . $before . get_the_title() . $after;
 } elseif ( is_tag() ) {
 if ( get_query_var(\'paged\') ) {
 $tag_id = get_queried_object_id();
 $tag = get_tag($tag_id);
 echo $sep . sprintf($link, get_tag_link($tag_id), $tag->name) . $sep . $before . sprintf($text[\'page\'], get_query_var(\'paged\')) . $after;
 } else {
 if ($show_current) echo $sep . $before . sprintf($text[\'tag\'], single_tag_title(\'\', false)) . $after;
 }
 } elseif ( is_author() ) {
 global $author;
 $author = get_userdata($author);
 if ( get_query_var(\'paged\') ) {
 if ($show_home_link) echo $sep;
 echo sprintf($link, get_author_posts_url($author->ID), $author->display_name) . $sep . $before . sprintf($text[\'page\'], get_query_var(\'paged\')) . $after;
 } else {
 if ($show_home_link && $show_current) echo $sep;
 if ($show_current) echo $before . sprintf($text[\'author\'], $author->display_name) . $after;
 }
 } elseif ( is_404() ) {
 if ($show_home_link && $show_current) echo $sep;
 if ($show_current) echo $before . $text[\'404\'] . $after;
 } elseif ( has_post_format() && !is_singular() ) {
 if ($show_home_link) echo $sep;
 echo get_post_format_string( get_post_format() );
 }
 echo $wrap_after;
 }
}

然后在需要显示面包屑的地方加上以下代码:

<?php if (function_exists(\'MBThemes_breadcrumbs\')) MBThemes_breadcrumbs(); ?>

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