Foundation 6 Menu for WP extending Walker class

FoundationMenu.php

<?php
class FoundationMenu extends Walker_Nav_Menu
{

  function display_element( $element, &$children_elements, $max_depth, $depth = 0, $args, &$output )
  {
    $element->has_children = !empty( $children_elements[$element->ID] );
    $element->classes[] = ( $element->current || $element->current_item_ancestor ) ? 'active' : '';
    $element->classes[] = ( $element->has_children ) ? 'has-dropdown' : '';
    parent:: display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
  }

  function start_el( &$output, $object, $depth = 0, $args = array ( ) , $current_object_id = 0 )
  {
    $item_html = '';
    parent:: start_el( $item_html, $object, $depth, $args );
    $output.= ( $depth == 0 ) ? '<li class = "divider"></li>' : '';
    $classes = empty( $object->classes ) ? array ( ) : ( array ) $object->classes;
    if( in_array( 'label', $classes ) ){
      $output.= '<li class = "divider"></li>';
      $item_html = preg_replace( '/<a[^>]*>( .* )<\/a>/iU', '<label>$1</label>', $item_html );
    }
    if ( in_array( 'divider', $classes ) ){
      $item_html = preg_replace( '/<a[^>]*>( .* )<\/a>/iU', '', $item_html );
    }
    $output.= $item_html;
  }

  function start_lvl( &$output, $depth = 0, $args = array ( ) )
  {
    $output.= "<ul class=\"menu vertical dropdown\" data-dropdown-menu>";
  }
}