我想从孩子们那里获取顶级菜单的所有信息

<li class="l-nav-item dropdown"><button class="open-icon visible-xs fa fa-angle-down"></button><a href=" ">Home</a>
            <ul class="dropdown-menu l-nav-sublist">
              <li class="l-nav-subitem"><a href="">Home Style I</a></li>
              <li class="l-nav-subitem dropdown"><button class="open-icon visible-xs fa fa-angle-down"></button><a href="">Home Style II</a>
                <ul class="dropdown-menu l-nav-sublist">
                  <li class="l-nav-subitem"><a href="">Home Style I</a></li>
                  <li class="l-nav-subitem"><a href="">Home Style II</a></li>
                  <li class="l-nav-subitem"><a href="">Home Style Portfolio</a></li>
                  <li class="l-nav-subitem dropdown"><button class="open-icon visible-xs fa fa-angle-down"></button><a href="">Home Style II</a>
                    <ul class="dropdown-menu l-nav-sublist">
                      <li class="l-nav-subitem"><a href="">Home Style I</a></li>
                      <li class="l-nav-subitem"><a href="">Home Style II</a></li>
                      <li class="l-nav-subitem"><a href="">Home Style Portfolio</a></li>
                      <li class="l-nav-subitem"><a href="">Subitem</a></li>
                    </ul>
                  </li>
                </ul>
              </li>
              <li class="l-nav-subitem"><a href="">One Page Home</a></li>
              <li class="l-nav-subitem"><a href="">Without Header</a></li>
            </ul>
          </li>

我想根据li子元素的顶级父元素输出它们。我使用一个名为

$item->megamenu

此字段仅出现在顶部li元素上。例如

 if($item->megamenu == 1 ) {
  do something
 }

但这对孩子没用所以我需要

 if($theparentitem->megamenu == 1) {

 }

其中，$theparentitem是$项的顶级父项

private megamenu_state;

if($depth == 0){
  $this->megamenu_state = $item->megamenu;
}