似乎OP已经通过这样做解决了他/她的问题，可以在Different menus for logged-in users.

if ( is_user_logged_in() ) {
     wp_nav_menu( array( \'theme_location\' => \'logged-in-menu\' ) );
} else {
     wp_nav_menu( array( \'theme_location\' => \'logged-out-menu\' ) );
}

实现这一目标的较短方法是这样做posted in new developer.wordpress.org 版本：

wp_nav_menu( array(
    \'theme_location\' => is_user_logged_in() ? \'logged-in-menu\' : \'logged-out-menu\'
) );

在不创建两个不同菜单的情况下实现这一点的可靠方法是使用自定义\'walker\' 功能：

查找主题在其wp_nav_menu():

wp_nav_menu( array(
    // More arguments here..
    \'walker\'         => new Your_Theme_Custom_Nav_Walker(),
) );

在“functions.php”中编写一个新类，扩展Your_Theme_Custom_Nav_Walker 类（您可以使用IDE轻松搜索其声明）或扩展Walker_Nav_Menu 如果他们不使用任何自定义walker，则初始化，并复制必要的函数进行修改，主要是start_el() 函数，在其声明中是该walker类的。下面是扩展Walker_Nav_Menu 我为满足您的需求而构建：

class WP_Custom_Nav_Walker extends Walker_Nav_Menu {

/**
 * Start the element output.
 *
 * @see Walker::start_el()
 *
 * @since 3.0.0
 *
 * @param string $output Passed by reference. Used to append additional content.
 * @param object $item   Menu item data object.
 * @param int    $depth  Depth of menu item. Used for padding.
 * @param array  $args   An array of arguments. @see wp_nav_menu()
 * @param int    $id     Current item ID.
 */
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
    $indent = ( $depth ) ? str_repeat( "\\t", $depth ) : \'\';

    $classes = empty( $item->classes ) ? array() : (array) $item->classes;
    $classes[] = \'menu-item-\' . $item->ID;

    /**
     * Filter the CSS class(es) applied to a menu item\'s list item element.
     *
     * @since 3.0.0
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param array  $classes The CSS classes that are applied to the menu item\'s `<li>` element.
     * @param object $item    The current menu item.
     * @param array  $args    An array of {@see wp_nav_menu()} arguments.
     * @param int    $depth   Depth of menu item. Used for padding.
     */
    $class_names = join( \' \', apply_filters( \'nav_menu_css_class\', array_filter( $classes ), $item, $args, $depth ) );
    $class_names = $class_names ? \' class="\' . esc_attr( $class_names ) . \'"\' : \'\';

    /**
     * Filter the ID applied to a menu item\'s list item element.
     *
     * @since 3.0.1
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param string $menu_id The ID that is applied to the menu item\'s `<li>` element.
     * @param object $item    The current menu item.
     * @param array  $args    An array of {@see wp_nav_menu()} arguments.
     * @param int    $depth   Depth of menu item. Used for padding.
     */
    $id = apply_filters( \'nav_menu_item_id\', \'menu-item-\'. $item->ID, $item, $args, $depth );
    $id = $id ? \' id="\' . esc_attr( $id ) . \'"\' : \'\';


    // MODIFICATION STARTS HERE!!
    $output .= $indent . \'<li\' . $id . $class_names;

    if (apply_filters(\'the_title\', $item->title, $item->ID) === \'My Account\') {
        if ( is_user_logged_in() ) {
            $output .= \'>\';
        } else {
            $output .= \'><a href="\' . get_site_url() . \'/wp-login.php">Log in</a></li>\';
            $output .= \'<li style="display: none">\';
        }
    } else {
        $output .= \'>\';
    }
    // MODIFICATION ENDS HERE!!


    $atts = array();
    $atts[\'title\']  = ! empty( $item->attr_title ) ? $item->attr_title : \'\';
    $atts[\'target\'] = ! empty( $item->target )     ? $item->target     : \'\';
    $atts[\'rel\']    = ! empty( $item->xfn )        ? $item->xfn        : \'\';
    $atts[\'href\']   = ! empty( $item->url )        ? $item->url        : \'\';

    /**
     * Filter the HTML attributes applied to a menu item\'s anchor element.
     *
     * @since 3.6.0
     * @since 4.1.0 The `$depth` parameter was added.
     *
     * @param array $atts {
     *     The HTML attributes applied to the menu item\'s `<a>` element, empty strings are ignored.
     *
     *     @type string $title  Title attribute.
     *     @type string $target Target attribute.
     *     @type string $rel    The rel attribute.
     *     @type string $href   The href attribute.
     * }
     * @param object $item  The current menu item.
     * @param array  $args  An array of {@see wp_nav_menu()} arguments.
     * @param int    $depth Depth of menu item. Used for padding.
     */
    $atts = apply_filters( \'nav_menu_link_attributes\', $atts, $item, $args, $depth );

    $attributes = \'\';
    foreach ( $atts as $attr => $value ) {
        if ( ! empty( $value ) ) {
            $value = ( \'href\' === $attr ) ? esc_url( $value ) : esc_attr( $value );
            $attributes .= \' \' . $attr . \'="\' . $value . \'"\';
        }
    }

    $item_output = $args->before;
    $item_output .= \'<a\'. $attributes .\'>\';
    /** This filter is documented in wp-includes/post-template.php */
    $item_output .= $args->link_before . apply_filters( \'the_title\', $item->title, $item->ID ) . $args->link_after;
    $item_output .= \'</a>\';
    $item_output .= $args->after;

    /**
     * Filter a menu item\'s starting output.
     *
     * The menu item\'s starting output only includes `$args->before`, the opening `<a>`,
     * the menu item\'s title, the closing `</a>`, and `$args->after`. Currently, there is
     * no filter for modifying the opening and closing `<li>` for a menu item.
     *
     * @since 3.0.0
     *
     * @param string $item_output The menu item\'s starting HTML output.
     * @param object $item        Menu item data object.
     * @param int    $depth       Depth of menu item. Used for padding.
     * @param array  $args        An array of {@see wp_nav_menu()} arguments.
     */
    $output .= apply_filters( \'walker_nav_menu_start_el\', $item_output, $item, $depth, $args );
}

}

你可以用这个WP_Custom_Nav_Walker 像这样：

wp_nav_menu( array(
    // More arguments here..
    \'walker\'         => new WP_Custom_Nav_Walker(),
) );

您可以检查this answer 另一个例子是如何做到这一点。