class custom_menu extends Walker_Nav_Menu

{



      function start_lvl(&$output, $depth) {

        $indent = str_repeat("", $depth);

        $output .= "<ul class=\"yog-grid\">";

      }







      function start_el(&$output, $item, $depth, $args)

      {

           global $wp_query;

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



           $class_names = $value = '';



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



           $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );

           $class_names = ' class="'. esc_attr( $class_names ) . '"';



           $output .= $indent . '<li>';



           //$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        ) .'"' : '';



           $prepend = '<span>';

           $append = '</span>';



            $item_output = $args->before;

            $item_output .= '<a'. $attributes .'>'.$prepend;

            $item_output .= $args->link_before .$prepend.apply_filters( 'the_title', $item->title, $item->ID );

            $item_output .= $append.'</a>';

            $item_output .= $args->after;



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

            }

}