如果你的网站使用了自定义文章类型，你可能需要将它的存档页面添加到导航菜单，虽然你可以使用“链接”来添加：
其实，最好的效果就是在菜单备选中罗列已有的自定义文章类型，然后可以选择添加至菜单：
if( !class_exists(\'CustomPostTypeArchiveInNavMenu\') ) {
class CustomPostTypeArchiveInNavMenu {
function CustomPostTypeArchiveInNavMenu() {
add_action( \'admin_head-nav-menus.php\', array( &$this, \'cpt_navmenu_metabox\' ) );
add_filter( \'wp_get_nav_menu_items\', array( &$this,\'cpt_archive_menu_filter\'), 10, 3 );
}
function cpt_navmenu_metabox() {
add_meta_box( \'add-cpt\', __(\'自定义文章类型存档\'), array( &$this, \'cpt_navmenu_metabox_content\' ), \'nav-menus\', \'side\', \'default\' );
}
function cpt_navmenu_metabox_content() {
$post_types = get_post_types( array( \'show_in_nav_menus\' => true, \'has_archive\' => true ), \'object\' );
if( $post_types ) {
foreach ( $post_types as &$post_type ) {
$post_type->classes = array();
$post_type->type = $post_type->name;
$post_type->object_id = $post_type->name;
$post_type->title = $post_type->labels->name . __( \'存档\' );
$post_type->object = \'cpt-archive\';
}
$walker = new Walker_Nav_Menu_Checklist( array() );
echo \'<div id=\"cpt-archive\" >\';
echo \'<div id=\"tabs-panel-cpt-archive\" >\';
echo \'<ul id=\"ctp-archive-checklist\" >\';
echo walk_nav_menu_tree( array_map(\'wp_setup_nav_menu_item\', $post_types), 0, (object) array( \'walker\' => $walker) );
echo \'</ul>\';
echo \'</div><!-- /.tabs-panel -->\';
echo \'</div>\';
echo \'<p >\';
echo \'<span >\';
echo \'<input type=\"submit\"\' . disabled( $nav_menu_selected_id, 0 ) . \'value=\"\'. __(\'添加至菜单\') . \'\" name=\"add-ctp-archive-menu-item\" id=\"submit-cpt-archive\" />\';
echo \'<span ></span>\';
echo \'</span>\';
echo \'</p>\';
} else {
echo \'没有自定义文章类型\';
}
}
function cpt_archive_menu_filter( $items, $menu, $args ) {
foreach( $items as &$item ) {
if( $item->object != \'cpt-archive\' ) continue;
$item->url = get_post_type_archive_link( $item->type );
if( get_query_var( \'post_type\' ) == $item->type ) {
$item->classes[] = \'current-menu-item\';
$item->current = true;
}
}
return $items;
}
}
$CustomPostTypeArchiveInNavMenu = new CustomPostTypeArchiveInNavMenu();
}
通过这个方法添加的自定义文章类型的存档页面，只要是属于这个文章类型的页面，都会自动在菜单中添加一个 current-menu-item：
<li class="current-menu-item"><a href="https://www.xxx.com/questions">问题存档</a></li>
配合 CSS 即可实现当前菜单项的高亮效果：
