Adicionar slug de página à classe CSS da tag body

if( !function_exists('add_slug_to_body_class') ) {
    function add_slug_to_body_class( $classes ) {
        global $post;
        if( is_home() ) {
            $key = array_search( 'blog', $classes );
            if($key > -1) {
                unset( $classes[$key] );
            };
        } elseif( is_page() ) {
            $classes[] = sanitize_html_class( $post->post_name );
        } elseif(is_singular()) {
            $classes[] = sanitize_html_class( $post->post_name );
        };
        return $classes;
    }
}
add_filter('body_class', 'add_slug_to_body_class');