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<ul class="navbar-nav  mr-auto"><?php
$linksMainObj = wp_get_nav_menu_items(5);
$mcnt=0;
foreach ($linksMainObj as $key => $val) {
  $mcnt++;
    if (isset($val->menu_item_parent) && $val->menu_item_parent == '0') {
        $level2Arr = array();
        $cntLevel  = 0;

        foreach ($linksMainObj as $key2 => $val2) {
            if ($val2->menu_item_parent == $val->ID) {
                $level2Arr[$cntLevel++] = array(
                    'target'       => $val2->target,
                    'url'          => $val2->url,
                    'post_excerpt' => $val2->post_excerpt,
                    'title' => $val2->title,
                );
            }
        }
        ?>
    <li class="nav-item<?php if (!empty($level2Arr)) {?> dropdown<?php } ?>"> <a id="menu_top_<?php echo $mcnt; ?>" target="<?php echo $val->target; ?>" class="nav-link"  href="<?php echo $val->url; ?>"><?php echo $val->title; ?></a>

                <?php if (!empty($level2Arr)) {
            ?>
                <ul class="dropdown-menu">
                  <?php foreach ($level2Arr as $kk => $vv) {?>

                  <li class="nav-item"> <a target="<?php echo $vv['target']; ?>" class="nav-link" href="<?php echo $vv['url']; ?>"> <?php echo $vv['title']; ?></a></li>
              <?php }?>

                </ul>
            <?php }?>


          </li>
          <?php }
}?>
        </ul>