wordpress教程:如何给文章页的body_class添加文章分类

add_filter('body_class','add_category_to_single');
function add_category_to_single($classes, $class) {
    if (is_single() ) {
        global $post;
        foreach((get_the_category($post->ID)) as $category) {
            $classes[] = 'sgl-cat-'.$category->category_nicename;
        }
    }
    return $classes;
}