在WordPress中添加边栏功能的正确代码是什么？

function register_my_sidebar() {
    $args = array(
        'name'          => __( 'My Sidebar', 'textdomain' ),
        'id'            => 'my-sidebar',
        'description'   => __( 'This is my custom sidebar.', 'textdomain' ),
        'class'         => 'my-sidebar',
        'before_widget' => '<div id="%1$s" class="widget %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<h2 class="widget-title">',
        'after_title'   => '</h2>',
    );
    register_sidebar( $args );
}
add_action( 'widgets_init', 'register_my_sidebar' );