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// Remove all classes in a Wordpress-based menus, except those given
function css_attributes_filter($var) {
    return is_array($var) ? array_intersect($var, array('current-menu-item','current_page_item','current-page-ancestor','current-menu-ancestor','current-menu-parent')) : '';
  }
add_filter('nav_menu_css_class', 'css_attributes_filter', 100, 1); 
add_filter('nav_menu_item_id', 'css_attributes_filter', 100, 1);