juliantroeps · May 6, 2020 07:35
diff --git a/active-cpt-menu-trail.php b/active-cpt-menu-trail.php
 <?php
 // on the single view of any custom post type item, make the archive menu item for that post type active

 // set the global scope variables
 $current_menu_parent = null;
 $current_menu_item   = null;

 // STEP 1: loop through all the menu items and find the current and parent items
 function squarecandy_active_items_prepare( $classes ) {

 	// get all the menu items
 	$menu = wp_get_nav_menu_items( 'main-menu' ); // insert your menu slug here

 	global $post;
 	global $current_menu_parent;
 	global $current_menu_item;

 	// loop through the menu items
 	foreach ( $menu as $menu_item ) {
 		$archive_link  = get_post_type_archive_link( $post->post_type );
 		$menu_item_url = $menu_item->url;
 		$base_url      = get_site_url();

 		// when you hit the item that matches the post type archive, save the current menu item and parent menu item.
 		if ( $archive_link === $menu_item_url || $archive_link === $base_url . $menu_item_url ) {
 			$current_menu_parent = (int) $menu_item->menu_item_parent;
 			$current_menu_item   = (int) $menu_item->ID;
 		}
 	}

 	// unrelated to the above, but required to keep body_class working correctly
 	return $classes;
 }
 add_filter( 'body_class', 'squarecandy_active_items_prepare', 99, 1 );

 // STEP 2: apply the current and parent classes as appropriate
 function squarecandy_active_item_classes( $classes = array(), $menu_item = false ) {
 	global $post;
 	global $current_menu_parent;
 	global $current_menu_item;

 	if ( $menu_item->ID === $current_menu_parent ) {
 		$classes[] = 'current-menu-ancestor';
 	}
 	if ( $menu_item->ID === $current_menu_item ) {
 		$classes[] = 'current-menu-item active';
 	}
 	return $classes;
 }
 add_filter( 'nav_menu_css_class', 'squarecandy_active_item_classes', 10, 2 );
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