WordPress如何添加面包屑导航

面包屑导航是一系列连接的导航链接，这些链接显示了您浏览网站页面的路径，面包屑通常显示在页面顶部，以方便访问。主要目的是使用户能够轻松地回溯，从而改善站点的UX，除此以外，面包屑导航对于整体网站体验和SEO都有好处。那么WordPress如何添加面包屑导航？

我们可以通过自定义代码实现面包屑，将以下代码添加到现用主题的functions.php文件中：

1. 1. // WordPress Breadcrumb Function
   2. // Add this code into your theme function file.
   4. function ah_breadcrumb() {
   6. // Check if is front/home page, return
   7. if ( is_front_page() ) {
   8. return;
   9. }
   11. // Define
   12. global $post;
   13. $custom_taxonomy = ''; // If you have custom taxonomy place it here
   15. $defaults = array(
   16. 'seperator' => '»',
   17. 'id' => 'ah-breadcrumb',
   18. 'classes' => 'ah-breadcrumb',
   19. 'home_title' => esc_html__( 'Home', '' )
   20. );
   22. $sep = '

   23. ‘
   24.  

       . esc_html( $defaults['seperator'] ) .'

‘;

1. 2. // Start the breadcrumb with a link to your homepage
   3. echo '

      .

       

      esc_attr( $defaults['id'] ) .'" class="'. esc_attr( $defaults['classes'] ) .'">';

   5. // Creating home link
   6. echo '

   7. .
   8.  

      get_home_url() .'">'. esc_html( $defaults['home_title'] ) .'

‘ . $sep;

1. 2. if ( is_single() ) {
   4. // Get posts type
   5. $post_type = get_post_type();
   7. // If post type is not post
   8. if( $post_type != 'post' ) {
   10. $post_type_object = get_post_type_object( $post_type );
   11. $post_type_link = get_post_type_archive_link( $post_type );
   13. echo '

   14. .
   15.  

       $post_type_link .'">'. $post_type_object->labels->name .'

‘. $sep;

1. 2. }
   4. // Get categories
   5. $category = get_the_category( $post->ID );
   7. // If category not empty
   8. if( !empty( $category ) ) {
   10. // Arrange category parent to child
   11. $category_values = array_values( $category );
   12. $get_last_category = end( $category_values );
   13. // $get_last_category = $category[count($category) - 1];
   14. $get_parent_category = rtrim( get_category_parents( $get_last_category->term_id, true, ',' ), ',' );
   15. $cat_parent = explode( ',', $get_parent_category );
   17. // Store category in $display_category
   18. $display_category = '';
   19. foreach( $cat_parent as $p ) {
   20. $display_category .= '

   21. ‘
   22.  

       . $p .'

‘ . $sep;

1. 1. }
   3. }
   5. // If it's a custom post type within a custom taxonomy
   6. $taxonomy_exists = taxonomy_exists( $custom_taxonomy );
   8. if( empty( $get_last_category ) && !empty( $custom_taxonomy ) && $taxonomy_exists ) {
   10. $taxonomy_terms = get_the_terms( $post->ID, $custom_taxonomy );
   11. $cat_id = $taxonomy_terms[0]->term_id;
   12. $cat_link = get_term_link($taxonomy_terms[0]->term_id, $custom_taxonomy);
   13. $cat_name = $taxonomy_terms[0]->name;
   15. }
   17. // Check if the post is in a category
   18. if( !empty( $get_last_category ) ) {
   20. echo $display_category;
   21. echo '

   22. ‘
   23.  

       . get_the_title() .'

‘;

1. 2. } else if( !empty( $cat_id ) ) {
   4. echo '

   5. .
   6.  

      $cat_link .'">'. $cat_name .'

‘ . $sep;

1. 1. echo '

   2. ‘
   3.  

      . get_the_title() .'

‘;

1. 2. } else {
   4. echo '

   5. ‘
   6.  

      . get_the_title() .'

‘;

1. 2. }
   4. } else if( is_archive() ) {
   6. if( is_tax() ) {
   7. // Get posts type
   8. $post_type = get_post_type();
   10. // If post type is not post
   11. if( $post_type != 'post' ) {
   13. $post_type_object = get_post_type_object( $post_type );
   14. $post_type_link = get_post_type_archive_link( $post_type );
   16. echo '

   17. .
   18.  

       $post_type . '">. $post_type_link . '">' . $post_type_object->labels->name . '

‘ . $sep;

1. 2. }
   4. $custom_tax_name = get_queried_object()->name;
   5. echo '

   6. ‘
   7.  

      . $custom_tax_name .'

‘;

1. 2. } else if ( is_category() ) {
   4. $parent = get_queried_object()->category_parent;
   6. if ( $parent !== 0 ) {
   8. $parent_category = get_category( $parent );
   9. $category_link = get_category_link( $parent );
   11. echo '

   12. .
   13.  

       esc_url( $category_link ) .'">'. $parent_category->name .'

‘ . $sep;

1. 2. }
   4. echo '

   5. ‘
   6.  

      . single_cat_title( '', false ) .'

‘;

1. 2. } else if ( is_tag() ) {
   4. // Get tag information
   5. $term_id = get_query_var('tag_id');
   6. $taxonomy = 'post_tag';
   7. $args = 'include=' . $term_id;
   8. $terms = get_terms( $taxonomy, $args );
   9. $get_term_name = $terms[0]->name;
   11. // Display the tag name
   12. echo '

   13. ‘
   14.  

       . $get_term_name .'

‘;

1. 2. } else if( is_day() ) {
   4. // Day archive
   6. // Year link
   7. echo '

   8. .
   9.  

      get_year_link( get_the_time('Y') ) .'">'. get_the_time('Y') . ' Archives

‘ . $sep;

1. 2. // Month link
   3. echo '

   4. .
   5.  

      get_month_link( get_the_time('Y'), get_the_time('m') ) .'">'. get_the_time('M') .' Archives

‘ . $sep;

1. 2. // Day display
   3. echo '

   4. ‘
   5.  

      . get_the_time('jS') .' '. get_the_time('M'). ' Archives

‘;

1. 2. } else if( is_month() ) {
   4. // Month archive
   6. // Year link
   7. echo '

   8. .
   9.  

      get_year_link( get_the_time('Y') ) .'">'. get_the_time('Y') . ' Archives

‘ . $sep;

1. 2. // Month Display
   3. echo '

   4. ‘
   5.  

      . get_the_time('M') .' Archives

‘;

1. 2. } else if ( is_year() ) {
   4. // Year Display
   5. echo '

   6. ‘
   7.  

      . get_the_time('Y') .' Archives

‘;

1. 2. } else if ( is_author() ) {
   4. // Auhor archive
   6. // Get the author information
   7. global $author;
   8. $userdata = get_userdata( $author );
   10. // Display author name
   11. echo '

   12. ‘
   13.  

       . 'Author: '. $userdata->display_name . '

‘;

1. 2. } else {
   4. echo '

   5. ‘
   6.  

      . post_type_archive_title() .'

‘;

1. 2. }
   4. } else if ( is_page() ) {
   6. // Standard page
   7. if( $post->post_parent ) {
   9. // If child page, get parents
   10. $anc = get_post_ancestors( $post->ID );
   12. // Get parents in the right order
   13. $anc = array_reverse( $anc );
   15. // Parent page loop
   16. if ( !isset( $parents ) ) $parents = null;
   17. foreach ( $anc as $ancestor ) {
   19. $parents .= '

   20. .
   21.  

       get_permalink( $ancestor ) .'">'. get_the_title( $ancestor ) .'

‘ . $sep;

1. 2. }
   4. // Display parent pages
   5. echo $parents;
   7. // Current page
   8. echo '

   9. ‘
   10.  

       . get_the_title() .'

‘;

1. 2. } else {
   4. // Just display current page if not parents
   5. echo '

   6. ‘
   7.  

      . get_the_title() .'

‘;

1. 2. }
   4. } else if ( is_search() ) {
   6. // Search results page
   7. echo '

   8. Search results for: ‘
   9.  

      . get_search_query() .'

‘;

1. 2. } else if ( is_404() ) {
   4. // 404 page
   5. echo '

   6. ‘
   7.  

      . 'Error 404' . '

‘;

2. }
4. // End breadcrumb
5. echo '';
7. }

然后还需要将以下行添加到主题的header.php文件中：

1. php
2. // Call the breadcrumb function where you want to display
3. if ( function_exists('ah_breadcrumb') ) ah_breadcrumb();
4. ?>

第一个片段将面包屑添加到您的主题。第二个“调用”相关功能，以便导航链接出现在页眉中。请注意，您可能需要删除开头的<?php ，此代码才能与主题的现有文件一起使用。