使用has_nav_menu 检查位置是否已分配菜单

<?php
if ( has_nav_menu( $location ) ) {
     echo "Also in this section";
}
?>

http://codex.wordpress.org/Function_Reference/has_nav_menu

有关更高级的检查，您需要致电wp_get_nav_menu_items 并处理返回的项目，查看其中是否有子项。

下面是一个输出菜单的示例，显示了如何使用其输出：

// Get the nav menu based on $menu_name (same as \'theme_location\' or \'menu\' arg to wp_nav_menu)
// This code based on wp_nav_menu\'s code to get Menu ID from menu slug

$menu_name = \'custom_menu_slug\';

if ( ( $locations = get_nav_menu_locations() ) && isset( $locations[ $menu_name ] ) ) {
    $menu = wp_get_nav_menu_object( $locations[ $menu_name ] );

    $menu_items = wp_get_nav_menu_items($menu->term_id);

    $menu_list = \'<ul id="menu-\' . $menu_name . \'">\';

    foreach ( (array) $menu_items as $key => $menu_item ) {
        $title = $menu_item->title;
        $url = $menu_item->url;
        $menu_list .= \'<li><a href="\' . $url . \'">\' . $title . \'</a></li>\';
    }
    $menu_list .= \'</ul>\';
} else {
    $menu_list = \'<ul><li>Menu "\' . $menu_name . \'" not defined.</li></ul>\';
}
// $menu_list now ready to output

需要注意的一点是，导航菜单由导航菜单项组成，and these menu items are custom post types. 使用父子关联来确定深度，就像处理页面和帖子一样