Walker_Page::start_el( string $output, WP_Post $data_object, int $depth, array $args = array(), int $current_object_id )

	public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
		if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
			$t = "\t";
			$n = "\n";
		} else {
			$t = '';
			$n = '';
		}
		if ( $depth ) {
			$indent = str_repeat( $t, $depth );
		} else {
			$indent = '';
		}

		$css_class = array( 'page_item', 'page-item-' . $page->ID );

		if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
			$css_class[] = 'page_item_has_children';
		}

		if ( ! empty( $current_page ) ) {
			$_current_page = get_post( $current_page );
			if ( $_current_page && in_array( $page->ID, $_current_page->ancestors ) ) {
				$css_class[] = 'current_page_ancestor';
			}
			if ( $page->ID == $current_page ) {
				$css_class[] = 'current_page_item';
			} elseif ( $_current_page && $page->ID == $_current_page->post_parent ) {
				$css_class[] = 'current_page_parent';
			}
		} elseif ( $page->ID == get_option('page_for_posts') ) {
			$css_class[] = 'current_page_parent';
		}

		/**
		 * Filters the list of CSS classes to include with each page item in the list.
		 *
		 * @since WP-2.8.0
		 *
		 * @see wp_list_pages()
		 *
		 * @param array   $css_class    An array of CSS classes to be applied
		 *                              to each list item.
		 * @param WP_Post $page         Page data object.
		 * @param int     $depth        Depth of page, used for padding.
		 * @param array   $args         An array of arguments.
		 * @param int     $current_page ID of the current page.
		 */
		$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page ) );

		if ( '' === $page->post_title ) {
			/* translators: %d: ID of a post */
			$page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );
		}

		$args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];
		$args['link_after'] = empty( $args['link_after'] ) ? '' : $args['link_after'];

		$atts                 = array();
		$atts['href']         = get_permalink( $page->ID );
		$atts['aria-current'] = ( $page->ID == $current_page ) ? 'page' : '';

		/**
		 * Filters the HTML attributes applied to a page menu item's anchor element.
		 *
		 * @since WP-4.8.0
		 *
		 * @param array $atts {
		 *     The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
		 *
		 *     @type string $href         The href attribute.
		 *     @type string $aria_current The aria-current attribute.
		 * }
		 * @param WP_Post $page         Page data object.
		 * @param int     $depth        Depth of page, used for padding.
		 * @param array   $args         An array of arguments.
		 * @param int     $current_page ID of the current page.
		 */
		$atts = apply_filters( 'page_menu_link_attributes', $atts, $page, $depth, $args, $current_page );

		$attributes = '';
		foreach ( $atts as $attr => $value ) {
			if ( ! empty( $value ) ) {
				$value = esc_attr( $value );
				$attributes .= ' ' . $attr . '="' . $value . '"';
			}
		}

		$output .= $indent . sprintf(
			'<li class="%s"><a%s>%s%s%s</a>',
			$css_classes,
			$attributes,
			$args['link_before'],
			/** This filter is documented in wp-includes/post-template.php */
			apply_filters( 'the_title', $page->post_title, $page->ID ),
			$args['link_after']
		);

		if ( ! empty( $args['show_date'] ) ) {
			if ( 'modified' == $args['show_date'] ) {
				$time = $page->post_modified;
			} else {
				$time = $page->post_date;
			}

			$date_format = empty( $args['date_format'] ) ? '' : $args['date_format'];
			$output .= " " . mysql2date( $date_format, $time );
		}
	}