您需要相应的函数更新才能完成此操作。请参阅codex上的Widgets API：
http://codex.wordpress.org/Widgets_API
下面是他们的例子。
/**
* Adds Foo_Widget widget.
*/
class Foo_Widget extends WP_Widget {
/**
* Register widget with WordPress.
*/
function __construct() {
parent::__construct(
\'foo_widget\', // Base ID
__(\'Widget Title\', \'text_domain\'), // Name
array( \'description\' => __( \'A Foo Widget\', \'text_domain\' ), ) // Args
);
}
/**
* Front-end display of widget.
*
* @see WP_Widget::widget()
*
* @param array $args Widget arguments.
* @param array $instance Saved values from database.
*/
public function widget( $args, $instance ) {
$title = apply_filters( \'widget_title\', $instance[\'title\'] );
echo $args[\'before_widget\'];
if ( ! empty( $title ) )
echo $args[\'before_title\'] . $title . $args[\'after_title\'];
echo __( \'Hello, World!\', \'text_domain\' );
echo $args[\'after_widget\'];
}
/**
* Back-end widget form.
*
* @see WP_Widget::form()
*
* @param array $instance Previously saved values from database.
*/
public function form( $instance ) {
if ( isset( $instance[ \'title\' ] ) ) {
$title = $instance[ \'title\' ];
}
else {
$title = __( \'New title\', \'text_domain\' );
}
?>
<p>
<label for="<?php echo $this->get_field_id( \'title\' ); ?>"><?php _e( \'Title:\' ); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id( \'title\' ); ?>" name="<?php echo $this->get_field_name( \'title\' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>">
</p>
<?php
}
/**
* Sanitize widget form values as they are saved.
*
* @see WP_Widget::update()
*
* @param array $new_instance Values just sent to be saved.
* @param array $old_instance Previously saved values from database.
*
* @return array Updated safe values to be saved.
*/
public function update( $new_instance, $old_instance ) {
$instance = array();
$instance[\'title\'] = ( ! empty( $new_instance[\'title\'] ) ) ? strip_tags( $new_instance[\'title\'] ) : \'\';
return $instance;
}
} // class Foo_Widget
