是否使用选项中打开的自定义菜单css类，通过walker函数将这些类应用于span 而不是li\'s?

我的定制助行器：

class ik_walker extends Walker_Nav_Menu {

    function start_lvl(&$output, $depth) {
        $GLOBALS[\'ik_walker_counter\'] = 0;
        $output .= \'<nav class="site-navigation" role="navigation">\'.
            \'<ul>\';
    }

    function end_lvl(&$output, $depth) {
        $output .= \'</ul>\'.
            \'<button id="menu" class="menu-button" type="button" role="button" aria-label="Menu Toggle">\'.
            \'<span class="icon-menu"></span>\'.
            \'</button>\'.
            \'</div>\';
    }

    function start_el(&$output, $item, $depth, $args) {
        global $wp_query;
        $GLOBALS[\'ik_walker_counter\']++;
        $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 id="menu-item-\'. $item->ID . \'"\' . $value . $class_names .\'>\';
        $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        ) .\'"\' : \'\';
        $attributes .= \' class="c\'.$GLOBALS[\'ik_walker_counter\'].\'"\';
        $item_output = $args->before;
        $item_output .= \'<a\'. $attributes .\'>\';
        $item_output .= $args->link_before . apply_filters( \'the_title\', $item->title, $item->ID ) . $args->link_after;
        if(strlen($item->description)>2){ $item_output .= \'<br /><span class="sub">\' . $item->description . \'</span>\'; }
        $item_output .= \'<span class="\'. $item->classes .\'"></span>\';
        $item_output .= \'</a>\';
        $item_output .= $args->after;
        $output .= apply_filters( \'walker_nav_menu_start_el\', $item_output, $item, $depth, $args );
    }
}

$item_output .= \'<span class="\'. $item->classes .\'"></span>\';

<span class="Array"></span>

任何帮助都将不胜感激。