GregWallace · April 12, 2014 13:50
diff --git a/fix-blog-menu-item-custom-post-type.php b/fix-blog-menu-item-custom-post-type.php
 // As of WP 3.1.1 addition of classes for css styling to parents of custom post types doesn't exist.
 // We want the correct classes added to the correct custom post type parent in the wp-nav-menu for css styling and highlighting, so we're modifying each individually...
 // The id of each link is required for each one you want to modify
 // Place this in your WordPress functions.php file
 // Reference: http://wordpress.org/support/topic/why-does-blog-become-current_page_parent-with-custom-post-type

 function remove_parent_classes($class)
 {
  // check for current page classes, return false if they exist.
    return ($class == 'current_page_item' || $class == 'current_page_parent' || $class == 'current_page_ancestor'  || $class == 'current-menu-item') ? FALSE : TRUE;
 }

 function add_class_to_wp_nav_menu($classes)
 {
     switch (get_post_type())
     {
        case 'case-studies':
            // we're viewing a custom post type, so remove the 'current_page_xxx and current-menu-item' from all menu items.
            $classes = array_filter($classes, "remove_parent_classes");

            // add the current page class to a specific menu item (replace ###). View source on menu to see relevant id
            if (in_array('menu-item-25', $classes))
            {
               $classes[] = 'current_page_parent';
         }
            break;


      // add more cases if necessary and/or a default
     }
    return $classes;
 }
 add_filter('nav_menu_css_class', 'add_class_to_wp_nav_menu');
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