下面是一个用于显示登录/注销和注册URL的函数

//Add login/logout link to naviagation menu
function add_login_out_item_to_menu_wpa84418( $items, $args ){

    //change theme location with your them location name
    if( is_admin() ||  $args->theme_location != \'LOCATION\' )
        return $items; 

    $redirect = ( is_home() ) ? false : get_permalink();

    if( is_user_logged_in( ) )
        $link = \'<a href="\' . wp_logout_url( $redirect ) . \'" title="\' .  __( \'Logout\' ) .\'">\' . __( \'Logout\' ) . \'</a>\';
    else {
        $link = \'<a href="\' . wp_login_url( $redirect  ) . \'" title="\' .  __( \'Login\' ) .\'">\' . __( \'Login\' ) . \'</a>\';
        if (get_option(\'users_can_register\'))
            $link = wp_register(\'<li>\', \'</li>\', false) . $link;

    }
    return $items.= \'<li id="log-in-out-link" class="menu-item menu-type-link">\'. $link . \'</li>\';

}
add_filter( \'wp_nav_menu_items\', \'add_login_out_item_to_menu_wpa84418\', 50, 2 );