无插件为wordpress主题添加面包屑导航

面包屑导航是一种导航技术，显示从主页到当前查看页面的所有访问过的页面。 所有页面都链接在一起，以便于向后导航。 通常这被放置在网页的顶部附近。 因此，例如，如果您查看此页面的顶部，您将看到导航路径回到主页的导航菜单。有很多可以为你处理面包屑导航的WordPress插件，但它们并不总是最好的选择，因为它们往往会让事情变得…

面包屑导航是一种导航技术，显示从主页到当前查看页面的所有访问过的页面。 所有页面都链接在一起，以便于向后导航。 通常这被放置在网页的顶部附近。 因此，例如，如果您查看此页面的顶部，您将看到导航路径回到主页的导航菜单。

有很多可以为你处理面包屑导航的WordPress插件，但它们并不总是最好的选择，因为它们往往会让事情变得错误并最终变得比它们的价值更麻烦。 以下代码将很快在您的网站上使用面包屑。

特点：下面的代码支持

父级及子级页面 归档 自定文章类型 自定义分类支持

使用方法：只需将以下代码粘贴到主题的functions.php文件中：

// Breadcrumbsfunction custom_breadcrumbs() {           // Settings    $separator          = '>';    $breadcrums_id      = 'breadcrumbs';    $breadcrums_class   = 'breadcrumbs';    $home_title         = 'Homepage';          // If you have any custom post types with custom taxonomies, put the taxonomy name below (e.g. product_cat)    $custom_taxonomy    = 'product_cat';           // Get the query & post information    global $post,$wp_query;           // Do not display on the homepage    if ( !is_front_page() ) {               // Build the breadcrums        echo '<ul id="' . $breadcrums_id . '" class="' . $breadcrums_class . '">';                   // Home page        echo '<li class="item-home"><a class="bread-link bread-home" href="'%20.%20get_home_url()%20.%20'" title="' . $home_title . '">' . $home_title . '</a></li>';        echo '<li class="separator separator-home"> ' . $separator . ' </li>';                   if ( is_archive() && !is_tax() && !is_category() && !is_tag() ) {                          echo '<li class="item-current item-archive"><strong class="bread-current bread-archive">' . post_type_archive_title($prefix, false) . '</strong></li>';                      } else if ( is_archive() && is_tax() && !is_category() && !is_tag() ) {                          // If post is a custom post type            $post_type = get_post_type();                          // If it is a custom post type display name and link            if($post_type != 'post') {                                  $post_type_object = get_post_type_object($post_type);                $post_type_archive = get_post_type_archive_link($post_type);                              echo '<li class="item-cat item-custom-post-type-' . $post_type . '"><a class="bread-cat bread-custom-post-type-' . $post_type . '" href="'%20.%20$post_type_archive%20.%20'" title="' . $post_type_object->labels->name . '">' . $post_type_object->labels->name . '</a></li>';                echo '<li class="separator"> ' . $separator . ' </li>';                          }                          $custom_tax_name = get_queried_object()->name;            echo '<li class="item-current item-archive"><strong class="bread-current bread-archive">' . $custom_tax_name . '</strong></li>';                      } else if ( is_single() ) {                          // If post is a custom post type            $post_type = get_post_type();                          // If it is a custom post type display name and link            if($post_type != 'post') {                                  $post_type_object = get_post_type_object($post_type);                $post_type_archive = get_post_type_archive_link($post_type);                              echo '<li class="item-cat item-custom-post-type-' . $post_type . '"><a class="bread-cat bread-custom-post-type-' . $post_type . '" href="'%20.%20$post_type_archive%20.%20'" title="' . $post_type_object->labels->name . '">' . $post_type_object->labels->name . '</a></li>';                echo '<li class="separator"> ' . $separator . ' </li>';                          }                          // Get post category info            $category = get_the_category();                         if(!empty($category)) {                              // Get last category post is in                $last_category = end(array_values($category));                                  // Get parent any categories and create array                $get_cat_parents = rtrim(get_category_parents($last_category->term_id, true, ','),',');                $cat_parents = explode(',',$get_cat_parents);                                  // Loop through parent categories and store in variable $cat_display                $cat_display = '';                foreach($cat_parents as $parents) {                    $cat_display .= '<li class="item-cat">'.$parents.'</li>';                    $cat_display .= '<li class="separator"> ' . $separator . ' </li>';                }                         }                          // If it's a custom post type within a custom taxonomy            $taxonomy_exists = taxonomy_exists($custom_taxonomy);            if(empty($last_category) && !empty($custom_taxonomy) && $taxonomy_exists) {                                   $taxonomy_terms = get_the_terms( $post->ID, $custom_taxonomy );                $cat_id         = $taxonomy_terms[0]->term_id;                $cat_nicename   = $taxonomy_terms[0]->slug;                $cat_link       = get_term_link($taxonomy_terms[0]->term_id, $custom_taxonomy);                $cat_name       = $taxonomy_terms[0]->name;                           }                          // Check if the post is in a category            if(!empty($last_category)) {                echo $cat_display;                echo '<li class="item-current item-' . $post->ID . '"><strong class="bread-current bread-' . $post->ID . '" title="' . get_the_title() . '">' . get_the_title() . '</strong></li>';                              // Else if post is in a custom taxonomy            } else if(!empty($cat_id)) {                                  echo '<li class="item-cat item-cat-' . $cat_id . ' item-cat-' . $cat_nicename . '"><a class="bread-cat bread-cat-' . $cat_id . ' bread-cat-' . $cat_nicename . '" href="'%20.%20$cat_link%20.%20'" title="' . $cat_name . '">' . $cat_name . '</a></li>';                echo '<li class="separator"> ' . $separator . ' </li>';                echo '<li class="item-current item-' . $post->ID . '"><strong class="bread-current bread-' . $post->ID . '" title="' . get_the_title() . '">' . get_the_title() . '</strong></li>';                          } else {                                  echo '<li class="item-current item-' . $post->ID . '"><strong class="bread-current bread-' . $post->ID . '" title="' . get_the_title() . '">' . get_the_title() . '</strong></li>';                              }                      } else if ( is_category() ) {                           // Category page            echo '<li class="item-current item-cat"><strong class="bread-current bread-cat">' . single_cat_title('', false) . '</strong></li>';                       } else if ( is_page() ) {                           // Standard page            if( $post->post_parent ){                                   // If child page, get parents                 $anc = get_post_ancestors( $post->ID );                                   // Get parents in the right order                $anc = array_reverse($anc);                                   // Parent page loop                if ( !isset( $parents ) ) $parents = null;                foreach ( $anc as $ancestor ) {                    $parents .= '<li class="item-parent item-parent-' . $ancestor . '"><a class="bread-parent bread-parent-' . $ancestor . '" href="'%20.%20get_permalink($ancestor)%20.%20'" title="' . get_the_title($ancestor) . '">' . get_the_title($ancestor) . '</a></li>';                    $parents .= '<li class="separator separator-' . $ancestor . '"> ' . $separator . ' </li>';                }                                   // Display parent pages                echo $parents;                                   // Current page                echo '<li class="item-current item-' . $post->ID . '"><strong title="' . get_the_title() . '"> ' . get_the_title() . '</strong></li>';                               } else {                                   // Just display current page if not parents                echo '<li class="item-current item-' . $post->ID . '"><strong class="bread-current bread-' . $post->ID . '"> ' . get_the_title() . '</strong></li>';                               }                       } else if ( is_tag() ) {                           // Tag page                           // Get tag information            $term_id        = get_query_var('tag_id');            $taxonomy       = 'post_tag';            $args           = 'include=' . $term_id;            $terms          = get_terms( $taxonomy, $args );            $get_term_id    = $terms[0]->term_id;            $get_term_slug  = $terms[0]->slug;            $get_term_name  = $terms[0]->name;                           // Display the tag name            echo '<li class="item-current item-tag-' . $get_term_id . ' item-tag-' . $get_term_slug . '"><strong class="bread-current bread-tag-' . $get_term_id . ' bread-tag-' . $get_term_slug . '">' . $get_term_name . '</strong></li>';                   } elseif ( is_day() ) {                           // Day archive                           // Year link            echo '<li class="item-year item-year-' . get_the_time('Y') . '"><a class="bread-year bread-year-' . get_the_time('Y') . '" href="'%20.%20get_year_link(%20get_the_time('Y')%20)%20.%20'" title="' . get_the_time('Y') . '">' . get_the_time('Y') . ' Archives</a></li>';            echo '<li class="separator separator-' . get_the_time('Y') . '"> ' . $separator . ' </li>';                           // Month link            echo '<li class="item-month item-month-' . get_the_time('m') . '"><a class="bread-month bread-month-' . get_the_time('m') . '" href="'%20.%20get_month_link(%20get_the_time('Y'),%20get_the_time('m')%20)%20.%20'" title="' . get_the_time('M') . '">' . get_the_time('M') . ' Archives</a></li>';            echo '<li class="separator separator-' . get_the_time('m') . '"> ' . $separator . ' </li>';                           // Day display            echo '<li class="item-current item-' . get_the_time('j') . '"><strong class="bread-current bread-' . get_the_time('j') . '"> ' . get_the_time('jS') . ' ' . get_the_time('M') . ' Archives</strong></li>';                       } else if ( is_month() ) {                           // Month Archive                           // Year link            echo '<li class="item-year item-year-' . get_the_time('Y') . '"><a class="bread-year bread-year-' . get_the_time('Y') . '" href="'%20.%20get_year_link(%20get_the_time('Y')%20)%20.%20'" title="' . get_the_time('Y') . '">' . get_the_time('Y') . ' Archives</a></li>';            echo '<li class="separator separator-' . get_the_time('Y') . '"> ' . $separator . ' </li>';                           // Month display            echo '<li class="item-month item-month-' . get_the_time('m') . '"><strong class="bread-month bread-month-' . get_the_time('m') . '" title="' . get_the_time('M') . '">' . get_the_time('M') . ' Archives</strong></li>';                       } else if ( is_year() ) {                           // Display year archive            echo '<li class="item-current item-current-' . get_the_time('Y') . '"><strong class="bread-current bread-current-' . get_the_time('Y') . '" title="' . get_the_time('Y') . '">' . get_the_time('Y') . ' Archives</strong></li>';                       } else if ( is_author() ) {                           // Auhor archive                           // Get the author information            global $author;            $userdata = get_userdata( $author );                           // Display author name            echo '<li class="item-current item-current-' . $userdata->user_nicename . '"><strong class="bread-current bread-current-' . $userdata->user_nicename . '" title="' . $userdata->display_name . '">' . 'Author: ' . $userdata->display_name . '</strong></li>';                   } else if ( get_query_var('paged') ) {                           // Paginated archives            echo '<li class="item-current item-current-' . get_query_var('paged') . '"><strong class="bread-current bread-current-' . get_query_var('paged') . '" title="Page ' . get_query_var('paged') . '">'.__('Page') . ' ' . get_query_var('paged') . '</strong></li>';                       } else if ( is_search() ) {                       // Search results page            echo '<li class="item-current item-current-' . get_search_query() . '"><strong class="bread-current bread-current-' . get_search_query() . '" title="Search results for: ' . get_search_query() . '">Search results for: ' . get_search_query() . '</strong></li>';                   } elseif ( is_404() ) {                           // 404 page            echo '<li>' . 'Error 404' . '</li>';        }               echo '</ul>';               }       }

如果你是一个没有编码经验的初学者，我们建议使用面包屑插件，WordPress SEO有很棒的面包屑功能。 请注意，并非每个WordPress安装或主题都相同，为了使其正常运行，此代码可能需要稍作调整。

有些人在添加此功能后可能会遇到白屏或不良行为。 我们建议任何人通过FTP将其添加到他们的网站，而不是WordPress文件编辑器。 使用此代码需要您自担风险，但如果您对此代码有任何问题，请在评论中告知我们，我们将尽力以任何方式提供帮助。