apply_filters( 'page_css_class', string[] $css_class, WP_Post $page, int $depth, array $args, int $current_page_id )

153		 * @param string[] $css_class       An array of CSS classes to be applied to each list item.154		 * @param WP_Post  $page            Page data object.155		 * @param int      $depth           Depth of page, used for padding.156		 * @param array    $args            An array of arguments.157		 * @param int      $current_page_id ID of the current page.158		 */159		$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page_id ) );160		$css_classes = $css_classes ? ' class="' . esc_attr( $css_classes ) . '"' : '';161 162		if ( '' === $page->post_title ) {163			/* translators: %d: ID of a post. */164			$page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );165		}