?mür Yan?ko?lu

Honestly, you’re right.

I just tried to solve the problem by using the start_el function.

Your solution is more accurate because the performance is more important. Thank you for correcting.

This is a good idea!
Based on this code can also be used as follows:

function start_el(&$output, $item, $depth=0, $args=array()) {

  global $wpdb;
  $children_count = $wpdb->get_var(
    $wpdb->prepare("
      SELECT COUNT(*) FROM $wpdb->postmeta
      WHERE meta_key = %s
      AND meta_value = %d
    ", '_menu_item_menu_item_parent', $item->ID)
  );

  if( $children_count > 0 ) {
    $dropdown = ' dropdown';
    $dropdown_toggle = ' dropdown-toggle';
    $caret = ' <b class="caret"></b>';
  }

  [...]

Hi! I also had a similar problem and figured out just before ??

The Solution:

function start_el(&$output, $item, $depth=0, $args=array()) {

  $parents = array();
  if ( ( $locations = get_nav_menu_locations() ) && isset( $locations[ $args->theme_location ] ) ) {
    $menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] );
    $menu_items = wp_get_nav_menu_items($menu->term_id);
    foreach( $menu_items as $menu_item ) {
      if( $menu_item->menu_item_parent != 0 )
        $parents[] = $menu_item->menu_item_parent;
    }
  }

  $dropdown = ''; $dropdown_toggle = ''; $caret = '';
  if( in_array($item->ID, $parents ) ) {
    $dropdown = ' dropdown';
    $dropdown_toggle = ' dropdown-toggle';
    $caret = ' <b class="caret"></b>';
  }

  $active = $item->current ? ' active' : '';

  [...]

The important point is → if( in_array($item->ID, $parents ) ) { ... }
I hope that will be useful for you…

Please Note: In fact, we need only has_children property in $item variable.