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I have this code to show my navigation menu in the functions.php file.

class BootstrapNavMenuWalker extends Walker_Nav_Menu {


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


    $indent = str_repeat( "\t", $depth );
    $submenu = ($depth > 0) ? ' sub-menu' : '';
    $output    .= "\n$indent<ul class=\"dropdown-menu$submenu depth_$depth\">\n";

}

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


    $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

    $li_attributes = '';
    $class_names = $value = '';

    $classes = empty( $item->classes ) ? array() : (array) $item->classes;

    // managing divider: add divider class to an element to get a divider before it.
    $divider_class_position = array_search('divider', $classes);
    if($divider_class_position !== false){
        $output .= "<li class=\"divider\"></li>\n";
        unset($classes[$divider_class_position]);
    }

    $classes[] = ($args->has_children) ? 'dropdown' : '';
    $classes[] = ($item->current || $item->current_item_ancestor) ? 'active' : '';
    $classes[] = 'menu-item-' . $item->ID;
    if($depth && $args->has_children){
        $classes[] = 'dropdown-submenu';
    }


    $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
    $class_names = ' class="' . esc_attr( $class_names ) . '"';

    $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
    $id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : '';

    $output .= $indent . '<li' . $id . $value . $class_names . $li_attributes . '>';

    $attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
    $attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
    $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
    $attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
    $attributes .= ($args->has_children)        ? ' class="dropdown-toggle" data-toggle="dropdown"' : '';

    $item_output = $args->before;
    $item_output .= '<a'. $attributes .'>';
    $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
    $item_output .= ($depth == 0 && $args->has_children) ? ' <b class="caret"></b></a>' : '</a>';
    $item_output .= $args->after;


    $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}


function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output ) {
    //v($element);
    if ( !$element )
        return;

    $id_field = $this->db_fields['id'];

    //display this element
    if ( is_array( $args[0] ) )
        $args[0]['has_children'] = ! empty( $children_elements[$element->$id_field] );
    else if ( is_object( $args[0] ) )
        $args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
    $cb_args = array_merge( array(&$output, $element, $depth), $args);
    call_user_func_array(array(&$this, 'start_el'), $cb_args);

    $id = $element->$id_field;

    // descend only when the depth is right and there are childrens for this element
    if ( ($max_depth == 0 || $max_depth > $depth+1 ) && isset( $children_elements[$id]) ) {

        foreach( $children_elements[ $id ] as $child ){

            if ( !isset($newlevel) ) {
                $newlevel = true;
                //start the child delimiter
                $cb_args = array_merge( array(&$output, $depth), $args);
                call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
            }
            $this->display_element( $child, $children_elements, $max_depth, $depth + 1, $args, $output );
        }
        unset( $children_elements[ $id ] );
    }

    if ( isset($newlevel) && $newlevel ){
        //end the child delimiter
        $cb_args = array_merge( array(&$output, $depth), $args);
        call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
    }

    //end this element
    $cb_args = array_merge( array(&$output, $element, $depth), $args);
    call_user_func_array(array(&$this, 'end_el'), $cb_args);

}

}

register_nav_menus( array(
'primary' => __( 'Primary Menu', 'infi'),
'secondary' => __( 'Secondary Menu', 'infi' ),
 ) );

And I used this code to show my navigation in the header.php file.

 <?php
            $args = array(
                'theme_location' => 'primary',
                'depth'      => 0,
                'container'  => false,
                'menu_class'     => 'nav navbar-nav',
                'walker'     => new BootstrapNavMenuWalker()
            );
            wp_nav_menu($args);
        ?>

But the menu is showing multilevels. Only a single dropdown is visible. If I add more than one dropdown items in the navigation, it simply doesn't show up.

Any help please.

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