我的函数中有这些行。php修改我的网站前台的一些菜单：

add_filter( \'wp_setup_nav_menu_item\',\'decorate_mobile_menu\' );
function decorate_mobile_menu($item) {
    if ( strpos($item->title, \'SHIPPING\') !== false) {  
        $split = explode(" IN ", $item->title);     
        $item->title = \'<span class="shipping-menu-item">\' . $split[0] . \' IN </span>\';
        $item->title .= \'<br/>\';
        $item->title .= \'<span class="shipping-menu-item">\' . $split[1] . \'</span>\';
    }   
    return $item;
}

但每次我在后台“保存”相应的菜单时，它都会再次运行此功能，并且菜单标题中的html变得疯狂：

<span class="shipping-menu-item"><span class="shipping-menu-item"><span class="shipping-menu-item"><span class="shipping-menu-item"><span class="shipping-menu-item">FREE SHIPPING IN </span><br/><span class="shipping-menu-item"></span><br/><span class="shipping-menu-item"></span><br/><span class="shipping-menu-item"></span><br/><span class="shipping-menu-item"></span><br/><span class="shipping-menu-item"><br/>EUROPE FROM 150€</span></span></span></span></span>

你能帮我清理这个功能，只对前台负责吗？

谢谢

add_filter( \'wp_setup_nav_menu_item\',\'decorate_mobile_menu\' );
function decorate_mobile_menu($item) {
    if ( ! is_admin() ) {
        if ( strpos($item->title, \'SHIPPING\') !== false) {  
            $split = explode(" IN ", $item->title);     
            $item->title = \'<span class="shipping-menu-item">\' . $split[0] . \' IN </span>\';
            $item->title .= \'<br/>\';
            $item->title .= \'<span class="shipping-menu-item">\' . $split[1] . \'</span>\';
        }
    }

    return $item;
}