Hierarchical display of custom taxonomy

by

The wpse244577_list_terms() function below uses wp_list_categories() to do the heavy lifting, then modifies the results so that the terms are in reverse order of the hierarchy.

Place this code in a plugin or your theme’s functions.php file:

/**
 * Lists term links for a taxonomy in reverse order of hierarchy
 * 
 * Based on https://developer.wordpress.org/reference/functions/wp_list_categories/#comment-1169    
 * @param $taxonomy string taxonomy name
 * @param $separator string separator for terms
 */
function wpse244577_list_terms( $taxonomy, $separator=", " ) {        

    // Get the term IDs assigned to post.
    $post_terms = wp_get_object_terms( get_the_ID(), $taxonomy, [ 'fields' => 'ids' ] );

    if ( ! empty( $post_terms ) && ! is_wp_error( $post_terms ) ) {

        $terms = wp_list_categories( [
                'title_li'  => '',
                'style'     => 'none',
                'echo'      => false,
                'taxonomy'  => $taxonomy,
                'include'   => $post_terms,
                'separator' => $separator,
        ] );

        $terms = rtrim( trim( str_replace( $separator, $separator, $terms ) ), ', ' );
        $terms = explode( $separator, $terms );
        $terms = array_reverse( $terms );
        $terms = implode( $separator, $terms );

        echo  $terms;
    }
}

To use the function, call it within the loop of your theme, passing the desired taxonomy name as the first parameter:

wpse244577_list_terms( 'property_location' );

Leave a Comment