老问题，但在谷歌排名很高。这里有一个适用于当今Woocommerce的解决方案。

将此添加到您的函数中。php或自定义插件。

function exclude_brands_from_related( $categories ){
    // array of category id\'s that should be excluded
    $exclude_cats = array( \'100\', \'101\', \'102\');

    foreach( $categories as $index => $cat ){
        if( in_array( $cat->term_id, $exclude_cats ) ){
            unset($categories[$index]);
        }
    }

    return $categories;
}

add_filter( \'woocommerce_get_related_product_cat_terms\', \'exclude_brands_from_related\' );

function exclude_tags_from_related( $tags ){
    // array of tags that should be excluded
    $exclude_tags = array( \'discontinued\', \'whatever\', \'even-more\');

    foreach( $tags as $index => $tag ){
        if( in_array( $tag->slug, $exclude_tags ) ){
            unset($tags[$index]);
        }
    }

    return $tags;
}

add_filter( \'woocommerce_get_related_product_tag_terms\', \'exclude_tags_from_related\' );

使用开发时WooCommerce 只需查看插件文件。我找到了一个名为related.php在里面woocommerce\\template\\single-product\\ :

$args = apply_filters(\'woocommerce_related_products_args\', array(
\'post_type\'     => \'product\',
\'ignore_sticky_posts\'   => 1,
\'no_found_rows\'     => 1,
\'posts_per_page\'    => $posts_per_page,
\'orderby\'       => $orderby,
\'post__in\'      => $related,
\'post__not_in\'      => array($product->id)
) );