WordPress 面包屑导航Breadcrumbs 非插件实现

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 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('MBThemes_breadcrumbs')) MBThemes_breadcrumbs(); ?>

来源地址：WordPress 面包屑导航Breadcrumbs 非插件实现

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