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i have been trying to develop custom navigation in wordpress.

i want to add columns in sub menu item. i want to add images in navigation as well as create Multi column Navigation. Please check this attached screenshot.

i tried to develop using custom walker method. Need Help to create multi column menu

here is my code:

Navigation code:

      <?php wp_nav_menu( array( 'theme_location' => 'primary','container_class' => 'navbar-collapse collapse in','container_id' => 'defaultmenu', 'menu_class' => 'nav navbar-nav','depth' => 10,'walker' => new themeslug_walker_nav_menu ) ); ?>

custom walker function in Function.php file:

 class themeslug_walker_nav_menu extends Walker_Nav_Menu {

 // add classes to ul sub-menus
  function start_lvl( &$output, $depth = 0, $args = array() ) {
   // depth dependent classes
    $indent = ( $depth > 0  ? str_repeat( "\t", $depth ) : '' ); // code indent
   $display_depth = ( $depth + 1); // because it counts the first submenu as 0

   $classes = array(
    'sub-menu',
    ( $display_depth % 2  ? 'menu-odd' : 'menu-even' ),
    ( $display_depth >=2 ? 'sub-sub-menu' : '' ),
    'menu-depth-' . $display_depth
    );
  $class_names = implode( ' ', $classes );

   // build html
   $output .= "\n" . $indent . '<ul class="' . $class_names . '">' . "\n";
  }

     // add main/sub classes to li's and links
    function start_el(  &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
   global $wp_query;
  $indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent

   // depth dependent classes
    $depth_classes = array(
    ( $depth == 0 ? 'main-menu-item' : 'sub-menu-item' ),
    ( $depth >=2 ? 'sub-sub-menu-item' : '' ),
    ( $depth % 2 ? 'menu-item-odd' : 'menu-item-even' ),
    'menu-item-depth-' . $depth
    );
    $depth_class_names = esc_attr( implode( ' ', $depth_classes ) );

    // passed classes
    $classes = empty( $item->classes ) ? array() : (array) $item->classes;
   $class_names = esc_attr( implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) ) );

 // build html
  //print_r( $depth_class_names);

       $output .= $indent . '<li id="nav-menu-item-'. $item->ID . '" class="' . $depth_class_names . ' ' . $class_names . '">';


   // link 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 .= ' class="menu-link ' . ( $depth > 0 ? 'sub-menu-link' : 'main-menu-link' ) . '"';

     $item_output = sprintf( '%1$s<a%2$s>%3$s%4$s%5$s</a>%6$s',
    $args->before,
    $attributes,
    $args->link_before,
    apply_filters( 'the_title', $item->title, $item->ID ),
    $args->link_after,
    $args->after
   );

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

enter image description here

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