wordpress 面包屑导航

functions.php

function cmp_breadcrumbs() {
  $delimiter = '»'; // 分隔符
  $before = '<span class="current">'; // 在当前链接前插入
  $after = '</span>'; // 在当前链接后插入
  if ( !is_home() && !is_front_page() || is_paged() ) {
    echo '<div itemscope itemtype="http://schema.org/WebPage" id="crumbs">'.__( 'You are here:' , 'cmp' );
    global $post;
    $homeLink = home_url();
    echo ' <a itemprop="breadcrumb" href="' . $homeLink . '">' . __( 'Home' , 'cmp' ) . '</a> ' . $delimiter . ' ';
    if ( is_category() ) { // 分类 存档
      global $wp_query;
      $cat_obj = $wp_query->get_queried_object();
      $thisCat = $cat_obj->term_id;
      $thisCat = get_category($thisCat);
      $parentCat = get_category($thisCat->parent);
      if ($thisCat->parent != 0){
        $cat_code = get_category_parents($parentCat, TRUE, ' ' . $delimiter . ' ');
        echo $cat_code = str_replace ('<a','<a itemprop="breadcrumb"', $cat_code );
      }
      echo $before . '' . single_cat_title('', false) . '' . $after;
    } elseif ( is_day() ) { // 天 存档
      echo '<a itemprop="breadcrumb" href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' ';
      echo '<a itemprop="breadcrumb"  href="' . get_month_link(get_the_time('Y'),get_the_time('m')) . '">' . get_the_time('F') . '</a> ' . $delimiter . ' ';
      echo $before . get_the_time('d') . $after;
    } elseif ( is_month() ) { // 月 存档
      echo '<a itemprop="breadcrumb" href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' ';
      echo $before . get_the_time('F') . $after;
    } elseif ( is_year() ) { // 年 存档
      echo $before . get_the_time('Y') . $after;
    } elseif ( is_single() && !is_attachment() ) { // 文章
      if ( get_post_type() != 'post' ) { // 自定义文章类型
        $post_type = get_post_type_object(get_post_type());
        $slug = $post_type->rewrite;
        echo '<a itemprop="breadcrumb" href="' . $homeLink . '/' . $slug['slug'] . '/">' . $post_type->labels->singular_name . '</a> ' . $delimiter . ' ';
        echo $before . get_the_title() . $after;
      } else { // 文章 post
        $cat = get_the_category(); $cat = $cat[0];
        $cat_code = get_category_parents($cat, TRUE, ' ' . $delimiter . ' ');
        echo $cat_code = str_replace ('<a','<a itemprop="breadcrumb"', $cat_code );
        echo $before . get_the_title() . $after;
      }
    } elseif ( !is_single() && !is_page() && get_post_type() != 'post' ) {
      $post_type = get_post_type_object(get_post_type());
      echo $before . $post_type->labels->singular_name . $after;
    } elseif ( is_attachment() ) { // 附件
      $parent = get_post($post->post_parent);
      $cat = get_the_category($parent->ID); $cat = $cat[0];
      echo '<a itemprop="breadcrumb" href="' . get_permalink($parent) . '">' . $parent->post_title . '</a> ' . $delimiter . ' ';
      echo $before . get_the_title() . $after;
    } elseif ( is_page() && !$post->post_parent ) { // 页面
      echo $before . get_the_title() . $after;
    } elseif ( is_page() && $post->post_parent ) { // 父级页面
      $parent_id  = $post->post_parent;
      $breadcrumbs = array();
      while ($parent_id) {
        $page = get_page($parent_id);
        $breadcrumbs[] = '<a itemprop="breadcrumb" href="' . get_permalink($page->ID) . '">' . get_the_title($page->ID) . '</a>';
        $parent_id  = $page->post_parent;
      }
      $breadcrumbs = array_reverse($breadcrumbs);
      foreach ($breadcrumbs as $crumb) echo $crumb . ' ' . $delimiter . ' ';
      echo $before . get_the_title() . $after;
    } elseif ( is_search() ) { // 搜索结果
      echo $before ;
      printf( __( 'Search Results for: %s', 'cmp' ),  get_search_query() );
      echo  $after;
    } elseif ( is_tag() ) { //标签 存档
      echo $before ;
      printf( __( 'Tag Archives: %s', 'cmp' ), single_tag_title( '', false ) );
      echo  $after;
    } elseif ( is_author() ) { // 作者存档
      global $author;
      $userdata = get_userdata($author);
      echo $before ;
      printf( __( 'Author Archives: %s', 'cmp' ),  $userdata->display_name );
      echo  $after;
    } elseif ( is_404() ) { // 404 页面
      echo $before;
      _e( 'Not Found', 'cmp' );
      echo  $after;
    }
    if ( get_query_var('paged') ) { // 分页
      if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() )
        echo sprintf( __( '( Page %s )', 'cmp' ), get_query_var('paged') );
    }
    echo '</div>';
  }
}

主题调用代码:

<?php if(function_exists('cmp_breadcrumbs')) cmp_breadcrumbs();?>