我们在选择使用WordPress主题的时候,一般都是默认自带面包屑页面导航的,但是难免会有一些主题不是特别注重这些,所以没有面包屑功能,面包屑导航的插件也有不少,最好用的估计Breadcrumb NavXT插件,今天我们不说插件,给大家分享一个通过自定义代码实现面包屑导航功能。
说到此方法之前,请确保为您的站点创建备份。这样,如果发生故障,您可以回滚到干净的版本。您还应该使用子主题,以防止主题更新期间所做的更改被覆盖。您还需要考虑使自己熟悉微数据,以帮助您获得面包屑的全部SEO好处。Google提供了一些有关如何实现BreadcrumbList模式的示例。
// WordPress Breadcrumb Function
// Add this code into your theme function file.function ah_breadcrumb() {
// Check if is front/home page, return
if ( is_front_page() ) {
return;
}// Define
global $post;
$custom_taxonomy = ''; // If you have custom taxonomy place it here$defaults = array(
'seperator' => '»',
'id' => 'ah-breadcrumb',
'classes' => 'ah-breadcrumb',
'home_title' => esc_html__( 'Home', '' )
);$sep = '
- '. esc_html( $defaults['seperator'] ) .'
';
// Start the breadcrumb with a link to your homepage
echo '
';
// Creating home link
echo '
- '. esc_html( $defaults['home_title'] ) .'
' . $sep;
if ( is_single() ) {
// Get posts type
$post_type = get_post_type();// If post type is not post
if( $post_type != 'post' ) {$post_type_object = get_post_type_object( $post_type );
$post_type_link = get_post_type_archive_link( $post_type );echo '
- '. $post_type_object->labels->name .'
'. $sep;
}
// Get categories
$category = get_the_category( $post->ID );// If category not empty
if( !empty( $category ) ) {// Arrange category parent to child
$category_values = array_values( $category );
$get_last_category = end( $category_values );
// $get_last_category = $category[count($category) - 1];
$get_parent_category = rtrim( get_category_parents( $get_last_category->term_id, true, ',' ), ',' );
$cat_parent = explode( ',', $get_parent_category );// Store category in $display_category
$display_category = '';
foreach( $cat_parent as $p ) {
$display_category .= '
- '. $p .'
' . $sep;
}}
// If it's a custom post type within a custom taxonomy
$taxonomy_exists = taxonomy_exists( $custom_taxonomy );if( empty( $get_last_category ) && !empty( $custom_taxonomy ) && $taxonomy_exists ) {
$taxonomy_terms = get_the_terms( $post->ID, $custom_taxonomy );
$cat_id = $taxonomy_terms[0]->term_id;
$cat_link = get_term_link($taxonomy_terms[0]->term_id, $custom_taxonomy);
$cat_name = $taxonomy_terms[0]->name;}
// Check if the post is in a category
if( !empty( $get_last_category ) ) {echo $display_category;
echo '
- '. get_the_title() .'
';
} else if( !empty( $cat_id ) ) {
echo '
- '. $cat_name .'
' . $sep;
echo '
- '. get_the_title() .'
';
} else {
echo '
- '. get_the_title() .'
';
}
} else if( is_archive() ) {
if( is_tax() ) {
// Get posts type
$post_type = get_post_type();// If post type is not post
if( $post_type != 'post' ) {$post_type_object = get_post_type_object( $post_type );
$post_type_link = get_post_type_archive_link( $post_type );echo '
- ' . $post_type_object->labels->name . '
' . $sep;
}
$custom_tax_name = get_queried_object()->name;
echo '
- '. $custom_tax_name .'
';
} else if ( is_category() ) {
$parent = get_queried_object()->category_parent;
if ( $parent !== 0 ) {
$parent_category = get_category( $parent );
$category_link = get_category_link( $parent );echo '
- '. $parent_category->name .'
' . $sep;
}
echo '
- '. single_cat_title( '', false ) .'
';
} else if ( is_tag() ) {
// Get tag information
$term_id = get_query_var('tag_id');
$taxonomy = 'post_tag';
$args = 'include=' . $term_id;
$terms = get_terms( $taxonomy, $args );
$get_term_name = $terms[0]->name;// Display the tag name
echo '
- '. $get_term_name .'
';
} else if( is_day() ) {
// Day archive
// Year link
echo '
- '. get_the_time('Y') . ' Archives
' . $sep;
// Month link
echo '
- '. get_the_time('M') .' Archives
' . $sep;
// Day display
echo '
- '. get_the_time('jS') .' '. get_the_time('M'). ' Archives
';
} else if( is_month() ) {
// Month archive
// Year link
echo '
- '. get_the_time('Y') . ' Archives
' . $sep;
// Month Display
echo '
- '. get_the_time('M') .' Archives
';
} else if ( is_year() ) {
// Year Display
echo '
- '. get_the_time('Y') .' Archives
';
} else if ( is_author() ) {
// Auhor archive
// Get the author information
global $author;
$userdata = get_userdata( $author );// Display author name
echo '
- '. 'Author: '. $userdata->display_name . '
';
} else {
echo '
- '. post_type_archive_title() .'
';
}
} 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 .= '
- '. get_the_title( $ancestor ) .'
' . $sep;
}
// Display parent pages
echo $parents;// Current page
echo '
- '. get_the_title() .'
';
} else {
// Just display current page if not parents
echo '
- '. get_the_title() .'
';
}
} else if ( is_search() ) {
// Search results page
echo '
- Search results for: '. get_search_query() .'
';
} else if ( is_404() ) {
// 404 page
echo '
- ' . 'Error 404' . '
';
}
// End breadcrumb
echo '';
}
修改好之后,将以下行添加到主题的header.php文件中:
<?php // Call the breadcrumb function where you want to display if ( function_exists('ah_breadcrumb') ) ah_breadcrumb(); ?>
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,最后根据您的代码流利程度,您可以编写自定义函数来在站点上启用面包屑。您还可以使用CSS修改其外观。