下面的代码是一个简易代码，直接放入function.php中即可生效，如果有兴趣的朋友可以自行尝试一下。

function hstngr_register_widget() {
register_widget( 'hstngr_widget' );
}
add_action( 'widgets_init', 'hstngr_register_widget' );
class hstngr_widget extends WP_Widget {
function __construct() {
parent::__construct(
// widget ID
'hstngr_widget',
// widget name
__('Hostinger Sample Widget', ' hstngr_widget_domain'),
// widget description
array( 'description' => __( 'Hostinger Widget Tutorial', 'hstngr_widget_domain' ), )
);
}
public function widget( $args, $instance ) {
$title = apply_filters( 'widget_title', $instance['title'] );
echo $args['before_widget'];
//if title is present
if ( ! empty( $title ) )
echo $args['before_title'] . $title . $args['after_title'];
//output
echo __( 'Greetings from Hostinger.com!', 'hstngr_widget_domain' );
echo $args['after_widget'];
}
public function form( $instance ) {
if ( isset( $instance[ 'title' ] ) )
$title = $instance[ 'title' ];
else
$title = __( 'Default Title', 'hstngr_widget_domain' );
?>