如何获取WordPress自定义文章类型的分类法、分类及标签？

Got it! Since you already know how to fetch custom fields using get_post_custom($post->ID), let's walk through the equivalent ways to pull taxonomies, categories, and tags for your custom post types—these are purpose-built functions that make this way easier than digging into the database directly.

If you want to see all taxonomies registered to a specific custom post type (like your portfolio or book CPT), use get_object_taxonomies():

global $post;
// Replace 'your_custom_post_type' with your actual CPT slug
$taxonomies = get_object_taxonomies( $post->post_type, 'objects' );

echo '<pre>';
// Prints full taxonomy objects (labels, settings, etc.)
print_r( $taxonomies );
echo '</pre>';

If you just want the taxonomy slugs instead of full objects, swap the second parameter to 'names':

$taxonomy_slugs = get_object_taxonomies( $post->post_type, 'names' );
print_r( $taxonomy_slugs ); // Outputs something like array('category', 'post_tag', 'genre')

For the actual terms (categories, tags, or custom taxonomy terms) assigned to the current post, use get_the_terms(). This works for both default taxonomies (like category/post_tag) and your custom ones.

Example: Get Categories for the Post #

global $post;
$categories = get_the_terms( $post->ID, 'category' );

// Always check if we got valid results (not an error)
if ( ! is_wp_error( $categories ) && $categories ) {
    echo '<pre>';
    print_r( $categories ); // Shows all category objects assigned to the post
    echo '</pre>';
}

Example: Get Tags for the Post #

Tags are just a default taxonomy with the slug post_tag, so use the same function:

global $post;
$tags = get_the_terms( $post->ID, 'post_tag' );

if ( ! is_wp_error( $tags ) && $tags ) {
    print_r( $tags );
}

Example: Get Custom Taxonomy Terms #

If you have a custom taxonomy like genre for a book CPT:

global $post;
$genres = get_the_terms( $post->ID, 'genre' );

if ( ! is_wp_error( $genres ) && $genres ) {
    print_r( $genres );
}

If you need to pull all available terms in a taxonomy (not just those assigned to the current post), use get_terms():

// Replace 'genre' with your taxonomy slug
$all_genres = get_terms( array(
    'taxonomy' => 'genre',
    'hide_empty' => false, // Set to true if you only want terms with posts
) );

if ( ! is_wp_error( $all_genres ) && $all_genres ) {
    print_r( $all_genres );
}

These functions are the direct equivalent of get_post_custom() but tailored for taxonomy data—no need to mess with $wpdb queries unless you have super specific needs. Let me know if you need help tweaking any of these for your use case!

内容的提问来源于stack exchange，提问作者JeVic