From 9e07667864ca860d8683e30ccfdca796229c5657 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Mon, 1 May 2017 23:31:16 +0000
Subject: [PATCH] Menus: Introduce `page_menu_link_attributes` filter in
 `Walker_Page::start_el()` for the HTML attributes applied to a page menu
 item's anchor element.

This complements the `nav_menu_link_attributes` filter used in `Walker_Nav_Menu::start_el()`.

Props pbiron.
Fixes #40359.

git-svn-id: https://develop.svn.wordpress.org/trunk@40565 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/class-walker-page.php | 32 +++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/wp-includes/class-walker-page.php b/src/wp-includes/class-walker-page.php
index 30831bbc8a..8bec66f417 100644
--- a/src/wp-includes/class-walker-page.php
+++ b/src/wp-includes/class-walker-page.php
@@ -160,10 +160,38 @@ class Walker_Page extends Walker {
 		$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 );
+
+		/**
+		 * Filters the HTML attributes applied to a page menu item's anchor element.
+		 *
+		 * @since 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.
+		 * }
+		 * @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 href="%s">%s%s%s</a>',
+			'<li class="%s"><a%s>%s%s%s</a>',
 			$css_classes,
-			get_permalink( $page->ID ),
+			$attributes,
 			$args['link_before'],
 			/** This filter is documented in wp-includes/post-template.php */
 			apply_filters( 'the_title', $page->post_title, $page->ID ),