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。