如何让自定义文章类型支持body添加分类与标签类名的代码生效？

Got it, let's fix your code to work with custom post types! The main issue with your original function is that it only checks for static pages using is_page(), which excludes posts and custom post types. Here's how to update it:

Modified Code #

<?php
/**
 * Add categories and tags to body classes for all singular post types (including CPTs)
 *
 * @param array $classes Existing body classes
 * @return array Modified body classes
 */
function add_categories_and_tags($classes = array()) {
    // Target any single post, page, or custom post type
    if (is_singular()) {
        // Add default category classes (works for posts, pages (if enabled), and CPTs with 'category' taxonomy)
        $categories = get_the_category();
        if (!empty($categories)) {
            foreach ($categories as $cat) {
                $classes[] = 'category-' . sanitize_html_class($cat->slug, $cat->term_id);
            }
        }
        
        // Add default tag classes (works for posts and CPTs with 'post_tag' taxonomy)
        $tags = get_the_tags();
        if (!empty($tags)) {
            foreach ($tags as $tag) {
                $classes[] = 'tag-' . sanitize_html_class($tag->slug, $tag->term_id);
            }
        }
        
        // Optional: Add custom taxonomy classes for your CPTs (replace with your taxonomy slug)
        // $custom_terms = get_the_terms(get_the_ID(), 'your_custom_taxonomy');
        // if (!empty($custom_terms)) {
        //     foreach ($custom_terms as $term) {
        //         $classes[] = 'tax-' . sanitize_html_class($term->slug, $term->term_id);
        //     }
        // }
    }
    
    return $classes;
}
add_filter('body_class', 'add_categories_and_tags');

Key Changes Explained #

1. Swapped is_page() for is_singular(): This WordPress function returns true for any single entry (post, page, custom post type), so your code now applies to all singular content types.
2. Added sanitize_html_class(): This ensures the generated class names are valid HTML (no special characters or invalid characters), which is a best practice to avoid frontend issues.
3. Optional Custom Taxonomy Support: If your CPT uses a custom taxonomy instead of the default categories/tags, uncomment the last section and replace your_custom_taxonomy with your actual taxonomy slug to include those terms in the body classes.

Important Note for CPTs #

For the default category/tag classes to appear on your CPT, you need to have registered the CPT with those taxonomies. When you call register_post_type(), include this in your arguments:

'taxonomies' => array('category', 'post_tag'),

If you only want to target specific CPTs (not all), replace is_singular() with:

is_singular(array('post', 'page', 'your_cpt_slug'))

Just swap your_cpt_slug with the slug of your custom post type.

内容的提问来源于stack exchange，提问作者adifatz