如何使用”wp_get_nav_menu_items”在WordPress中显示3级层次菜单（）

我正在尝试使用wp_get_nav_menu_items函数在WordPress中显示3级层次菜单, 但是以某种方式未显示结构。
这是我包含在头文件中的代码, 但是结构不正确。

$menu_name = 'primary-menu'; $locations = get_nav_menu_locations(); $menu = wp_get_nav_menu_object($locations[$menu_name]); $menuitems = wp_get_nav_menu_items($menu-> term_id, array('order' => 'DESC')); $ParentArray = array(); foreach ($menuitems as $item) { // if (!empty($item-> menu_item_parent) & & !in_array($item-> menu_item_parent, $ParentArray)) { array_push($ParentArray, $item-> ID); // } } ?> < nav> < ul class="main-nav"> < ?php $count = 0; $submenu = false; foreach ($menuitems as $item): $link = $item-> url; $title = $item-> title; // item does not have a parent so menu_item_parent equals 0 (false) if (!$item-> menu_item_parent): // save this id for later comparison with sub-menu items $parent_id = $item-> ID; ?> < li class="item"> < a href="http://www.srcmini.com/< ?php echo $link; ?>" class="title"> < ?php echo $title; ?> < /a> < ?php endif; ?> < ?php if (in_array($item-> menu_item_parent, $ParentArray)): ?> < ?php if (!$submenu): $submenu = true; ?> < ul class="sub-menu"> < ?php endif; ?> < li class="item"> < a href="http://www.srcmini.com/< ?php echo $link; ?>" class="title"> < ?php echo $title; ?> < /a> < /li> < ?php if (!isset($menuitems[$count + 1]) || $menuitems[$count + 1]-> menu_item_parent != $parent_id & & $submenu): ?> < /ul> < ?php $submenu = false; endif; ?> < ?php endif; ?> < ?php if (!isset($menuitems[$count + 1]) || $menuitems[$count + 1]-> menu_item_parent != $parent_id): ?> < /li> < ?php $submenu = false; ?> < ?php $count++; endforeach; ?> < /ul> < /nav>

#1【如何使用” wp_get_nav_menu_items” 在WordPress中显示3级层次菜单（）】在上面的代码中进行更改后, 这件事对我有用。

$menu_name = 'primary-menu'; $locations = get_nav_menu_locations(); $menu = wp_get_nav_menu_object($locations[$menu_name]); $menuitems = wp_get_nav_menu_items($menu-> term_id, array('order' => 'DESC')); $ParentArray = array(); foreach ($menuitems as $item) { // if (!empty($item-> menu_item_parent) & & !in_array($item-> menu_item_parent, $ParentArray)) { array_push($ParentArray, $item-> ID); // } }?> < nav> < ul class="main-nav"> < ?php $count = 0; $submenu = false; foreach ($menuitems as $item): $link = $item-> url; $title = $item-> title; // item does not have a parent so menu_item_parent equals 0 (false) if (!$item-> menu_item_parent): // save this id for later comparison with sub-menu items $parent_id = $item-> ID; ?> < li class="item"> < a href="http://www.srcmini.com/< ?php echo $link; ?>" class="title"> < ?php echo $title; ?> < /a> < ?php endif; ?> < ?php if (in_array($item-> menu_item_parent, $ParentArray)): ?> < ?php if (!$submenu): $submenu = true; ?> < ul class="sub-menu"> < ?php endif; ?> < li class="item"> < a href="http://www.srcmini.com/< ?php echo $link; ?>" class="title"> < ?php echo $title; ?> < /a> < /li> < ?php if (!isset($item[$count + 1]) || $item[$count + 1]-> menu_item_parent != $parent_id & & $submenu): ?> < /ul> < ?php $submenu = false; endif; ?> < ?php endif; ?> < ?php if (!isset($menuitems[$count + 1]) || $menuitems[$count + 1]-> menu_item_parent != $parent_id): ?> < /li> < ?php $submenu = false; ?> < ?php $count++; endforeach; ?> < /ul> < /nav>