我正在处理一个子主题，我需要重写一个函数，以便删除顶部菜单上一些不需要的项目。所以我做了一些研究，发现了很多文档，真的，像this, this 和this 但我仍然不清楚如何在我的具体案例中实现这一点。所以我希望这里有人能给我指出正确的方向。我在原始主题中有此功能functions.php 文件：

function udesign_nav() {
    if ( function_exists( \'wp_nav_menu\' ) ) {
        $defaults = array(
            \'container_class\' => \'navigation-menu\',
            \'container_id\' => \'navigation-menu\',
            \'menu_id\'    => \'main-top-menu\',
            \'menu_class\' => \'sf-menu\',
            \'link_before\'=> \'<span>\',
            \'link_after\' => \'</span>\',
            \'theme_location\' => \'primary\',
            \'fallback_cb\' => \'udesign_nav_fallback\'
        );
        wp_nav_menu( $defaults );
    } else {
        udesign_nav_fallback();
    }
}

function udesign_nav_fallback() {
    $menu_html = \'<div id="navigation-menu" class="navigation-menu">\';
    $menu_html .= \'<ul id="main-top-menu" class="sf-menu">\';
    $menu_html .= is_front_page() ? "<li class=\'current_page_item\'>" : "<li>";
    $menu_html .= \'<a href="\'.home_url().\'"><span>\'.esc_html__(\'Home\', \'udesign\').\'</span></a></li>\';
    $menu_html .= wp_list_pages(\'depth=5&title_li=0&sort_column=menu_order&link_before=<span>&link_after=</span>&echo=0\');
    $menu_html .= \'</ul>\';
    $menu_html .= \'</div>\';
    echo $menu_html;
}

我想，它被称为：

// Setup the main menu
function udesign_top_main_menu() {
    ob_start(); ?>
            <div class="clear"></div>
            <div id="main-menu">
                <div id="dropdown-holder" class="container_24">
<?php               udesign_nav(); // this function calls the main menu ?>
                </div>
                <!-- end dropdown-holder -->
            </div>
            <!-- end top-main-menu -->
<?php
    $main_menu_html = ob_get_clean();
    echo apply_filters( \'udesign_get_top_main_menu\', $main_menu_html );
}
add_action(\'udesign_top_wrapper_bottom\', \'udesign_top_main_menu\', 10);

我需要重写的是从udesign_nav_fallback() 功能：

$menu_html .= is_front_page() ? "<li class=\'current_page_item\'>" : "<li>";
$menu_html .= \'<a href="\'.home_url().\'"><span>\'.esc_html__(\'Home\', \'udesign\').\'</span></a></li>\';

使用functions.php 关于儿童主题？

$menu_html .= is_front_page() ? "<li class=\'current_page_item\'>" : "<li>";
$menu_html .= \'<a href="\'.home_url().\'"><span>\'.esc_html__(\'Home\', \'udesign\').\'</span></a></li>\';

function udesign_strip($menu) {
  var_dump($menu);
  $menu_html = is_front_page() ? "<li class=\'current_page_item\'>" : "<li>";
  $menu_html .= \'<a href="\'.home_url().\'"><span>\'.esc_html__(\'Home\', \'udesign\').\'</span></a></li>\';
  $menu = str_replace($menu_html,\'\',$menu);
  return $menu;
}
add_filter(\'udesign_get_top_main_menu\',\'udesign_strip\');