我正试着开始写带有选项的自定义小部件。我一直在学习一些教程，并一直在努力理解。

我有一个小部件，它在小部件管理器中工作得很好，但在前端Undefined variable: image_path. 我无法追查我做错了什么，我肯定会感激你的另一双眼睛。

小部件代码：

/* Image Link Widget
===================================================== */
class ImageLinkWidget extends WP_Widget {

  function ImageLinkWidget() {
    $widget_ops = array(
      \'classname\' => \'google-map-widget nopadding\',
      \'description\' => \'An image that links somewhere\'
    );
    $this->WP_Widget(\'ImageLinkWidget\', \'Image + Link\', $widget_ops);
  }

  function form($instance) {
    $instance = wp_parse_args( (array) $instance, array( \'title\' => \'\', \'image_path\' => \'default\' ) );
    $title = $instance[\'title\'];
    $image_path = $instance[\'image_path\']
    ?>
      <p>
        <label for="<?php echo $this->get_field_id(\'title\'); ?>">
          Title: 
          <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); ?>" />
        </label>
      </p>
      <p>
        <label for="<?php echo $this->get_field_id(\'image_path\'); ?>">
          Image Path (include http://): 
          <input class="widefat" id="<?php echo $this->get_field_id(\'image_path\'); ?>" name="<?php echo $this->get_field_name(\'image_path\'); ?>" type="text" value="<?php echo esc_attr($image_path); ?>" />
        </label>
      </p>
    <?php
  }

  function update($new_instance, $old_instance) {
    $instance = $old_instance;
    $instance[\'title\'] = strip_tags( $new_instance[\'title\'] );
    $instance[\'image_path\'] = strip_tags( $new_instance[\'image_path\'] );
    return $instance;
  }

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

    echo $before_widget;
    $title = empty($instance[\'title\']) ? \' \' : apply_filters(\'widget_title\', $instance[\'title\']);

    if (!empty($title))
      echo $before_title . $title . $after_title;

    // Show image plus link
    //echo \'<a href="\' . $link . \'" target="\' . $target . \'">\';
      //echo \'<img src="\' . $image_path . \'" alt="\' . $alt_text . \'">\';
      echo $image_path;
    //echo \'</a>\';

    echo $after_widget;
  }

}
add_action( \'widgets_init\', create_function(\'\', \'return register_widget("ImageLinkWidget");\') );