因此，这是我第一次尝试创建一个小部件，它具有创建简单图像滚动效果的功能（如果任何人在完成后想要它，请给我留言）。

现在我下载了一个示例小部件并进行了一些更改，但我仍然没有触及输出的html部分，所以请忽略该部分。现在我的问题是，当我单击“保存”时，字段中的值会返回到其默认值，而在示例小部件上没有这样做。这是我的代码：

<?php
/**
 * Plugin Image: Rollover Widget
 * Description: A widget that creates a rollover image effect with a hyperlink.
 * Version: 0.1
 * Author: Zak Elas
 * Author URI:
 */


add_action( \'widgets_init\', \'my_widget\' );


function my_widget() {
    register_widget( \'MY_Widget\' );
}

class MY_Widget extends WP_Widget {

    function MY_Widget() {
        $widget_ops = array( \'classname\' => \'example\', \'description\' => __(\'A widget that creates a rollover image effect with a hyperlink. \', \'example\') );

        $control_ops = array( \'width\' => 300, \'height\' => 350, \'id_base\' => \'Rollover Widget\' );

        $this->WP_Widget( \'example-widget\', __(\'Example Widget\', \'example\'), $widget_ops, $control_ops );
    }

    function widget( $args, $instance ) {
        extract( $args );

        //Our variables from the widget settings.
        $link = apply_filters(\'widget_link\', $instance[\'link\'] );
        $image = $instance[\'image\'];
        $rollover_image = $instance[\'rollover_image\'];

        echo $before_widget;

        // Display the widget link 
        if ( $link )
            echo $before_link . $link . $after_link;

        //Display the name 

            printf( \'<p>\' . __(\'Hey their Sailor! My name is %1$s.\', \'example\') . \'</p>\', $image );


            printf( \'<p>\' . __(\'Hey their Sailor! My name is %1$s.\', \'example\') . \'</p>\', $rollover_image );



        echo $after_widget;
    }

    //Update the widget 

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;

        //Strip tags from link and name to remove HTML 
        $instance[\'link\'] = strip_tags( $new_instance[\'link\'] );
        $instance[\'image\'] = strip_tags( $new_instance[\'image\'] );
        $instance[\'rollover_image\'] = strip_tags( $new_instance[\'rollover_image\'] );

        return $instance;
    }


    function form( $instance ) {

        //Set up some default widget settings.
        $defaults = array( \'link\' => __(\'Example\', \'example\'), \'image\' => __(\'/images/editorial.png\', \'example\') , \'rollover_image\' => __(\'/images/editorial.png\', \'example\') );
        $instance = wp_parse_args( (array) $instance, $defaults ); ?>


        <p>
            <label for="<?php echo $this->get_field_id( \'link\' ); ?>"><?php _e(\'link\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'link\' ); ?>" name="<?php echo $this->get_field_name( \'link\' ); ?>" value="<?php echo $instance[\'link\']; ?>" style="width:100%;" />
        </p>


        <p>
            <label for="<?php echo $this->get_field_id( \'image\' ); ?>"><?php _e(\'image\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'image\' ); ?>" name="<?php echo $this->get_field_name( \'image\' ); ?>" value="<?php echo $instance[\'image\']; ?>" style="width:100%;" />
        </p>

        <p>
            <label for="<?php echo $this->get_field_id( \'rollover_image\' ); ?>"><?php _e(\'rollover_image:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'rollover_image\' ); ?>" name="<?php echo $this->get_field_name( \'image\' ); ?>" value="<?php echo $instance[\'rollover_image\']; ?>" style="width:100%;" />
        </p>



    <?php
    }
}

?>

<?php
/**
 * Plugin Name: A simple Widget
 * Description: A widget that displays authors name.
 * Version: 0.1
 * Author: Bilal Shaheen
 * Author URI: http://gearaffiti.com/about
 */


add_action( \'widgets_init\', \'my_widget\' );


function my_widget() {
    register_widget( \'MY_Widget\' );
}

class MY_Widget extends WP_Widget {

    function MY_Widget() {
        $widget_ops = array( \'classname\' => \'example\', \'description\' => __(\'A widget that displays the authors name \', \'example\') );

        $control_ops = array( \'width\' => 300, \'height\' => 350, \'id_base\' => \'example-widget\' );

        $this->WP_Widget( \'example-widget\', __(\'Example Widget\', \'example\'), $widget_ops, $control_ops );
    }

    function widget( $args, $instance ) {
        extract( $args );

        //Our variables from the widget settings.
        $title = apply_filters(\'widget_title\', $instance[\'title\'] );
        $name = $instance[\'name\'];
        $show_info = isset( $instance[\'show_info\'] ) ? $instance[\'show_info\'] : false;

        echo $before_widget;

        // Display the widget title 
        if ( $title )
            echo $before_title . $title . $after_title;

        //Display the name 
        if ( $name )
            printf( \'<p>\' . __(\'Hey their Sailor! My name is %1$s.\', \'example\') . \'</p>\', $name );


        if ( $show_info )
            printf( $name );


        echo $after_widget;
    }

    //Update the widget 

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;

        //Strip tags from title and name to remove HTML 
        $instance[\'title\'] = strip_tags( $new_instance[\'title\'] );
        $instance[\'name\'] = strip_tags( $new_instance[\'name\'] );
        $instance[\'show_info\'] = $new_instance[\'show_info\'];

        return $instance;
    }


    function form( $instance ) {

        //Set up some default widget settings.
        $defaults = array( \'title\' => __(\'Example\', \'example\'), \'name\' => __(\'Bilal Shaheen\', \'example\'), \'show_info\' => true );
        $instance = wp_parse_args( (array) $instance, $defaults ); ?>

        //Widget Title: Text Input.
        <p>
            <label for="<?php echo $this->get_field_id( \'title\' ); ?>"><?php _e(\'Title:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'title\' ); ?>" name="<?php echo $this->get_field_name( \'title\' ); ?>" value="<?php echo $instance[\'title\']; ?>" style="width:100%;" />
        </p>

        //Text Input.
        <p>
            <label for="<?php echo $this->get_field_id( \'name\' ); ?>"><?php _e(\'Your Name:\', \'example\'); ?></label>
            <input id="<?php echo $this->get_field_id( \'name\' ); ?>" name="<?php echo $this->get_field_name( \'name\' ); ?>" value="<?php echo $instance[\'name\']; ?>" style="width:100%;" />
        </p>


        //Checkbox.
        <p>
            <input class="checkbox" type="checkbox" <?php checked( $instance[\'show_info\'], true ); ?> id="<?php echo $this->get_field_id( \'show_info\' ); ?>" name="<?php echo $this->get_field_name( \'show_info\' ); ?>" /> 
            <label for="<?php echo $this->get_field_id( \'show_info\' ); ?>"><?php _e(\'Display info publicly?\', \'example\'); ?></label>
        </p>

    <?php
    }
}

?>