将以下代码加入到主题的functions.php里：
function My_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 class="breadcrumbs">';
$wrap_after = '</div>';
$sep = '>';
$sep_before = '<span class="sep">';
$sep_after = '</span>';
$show_home_link = 1;
$show_on_home = 0;
$show_current = 1;
$before = '<span class="current">';
$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('My_breadcrumbs')) My_breadcrumbs(); ?>
