Filter post_class to return terms from a custom taxonomy in WordPress

filter post class custom tax

function custom_taxonomy_post_class( $classes, $class, $ID ) {

    $taxonomy = 'pcategory';

    $terms = get_the_terms( (int) $ID, $taxonomy );

    if( !empty( $terms ) ) {

        foreach( (array) $terms as $order => $term ) {

            if( !in_array( $term->slug, $classes ) ) {

                $classes[] = $term->slug;

            }

        }

    }

    return $classes;

}

add_filter( 'post_class', 'custom_taxonomy_post_class', 10, 3 );