我写了一个wordpress小部件，列出了标签中博客的类别。最初我编写的代码可以工作，您可以选择一个值，当您单击保存时，小部件会在前端显示正确的信息。但是，在重新加载数组后点击保存后，它看起来像这样：
<select name="widget-cheer_recent_posts[7][cat]" id="widget-cheer_recent_posts-7-cat" class="widefat"></select>
<option value="72" id="Elite">Elite</option>
</p>
<option value="96" id="Featured">Featured</option>
<option value="70" id="Junior Varsity">Junior Varsity</option>
<option value="105" id="JV">JV</option>
<option value="67" id="Mixes">Mixes</option>
<option value="97" id="promo">promo</option>
<option value="99" id="Samples">Samples</option>
<option value="1" id="Uncategorized">Uncategorized</option>
<option value="71" id="Varsity">Varsity</option>
我不确定这是如何发生的，因为下拉列表第一次正确加载，只有在wordpress中保存和AJAX重新加载才会失败。这是小部件的代码：
define ('CHEER_PLUGIN_DIR', dirname( plugin_basename( __FILE__ ) ));
define ('CHEER_PLUGIN_URL', plugins_url() . '/' . CHEER_PLUGIN_DIR);
class cheer_recent_posts extends WP_Widget {
/** constructor */
function cheer_recent_posts() {
parent::WP_Widget(false, $name = 'Cheer Samples');
}
/** @see WP_Widget::widget */
function widget($args, $instance) {
extract( $args );
global $posttypes;
global $cats;
$title = apply_filters('widget_title', $instance['title']);
$cat = $instance['cat'];
$number = apply_filters('widget_title', $instance['number']);
$offset = apply_filters('widget_title', $instance['offset']);
$thumbnail_size = apply_filters('widget_title', $instance['thumbnail_size']);
$thumbnail = $instance['thumbnail'];
$posttype = $instance['posttype'];
?>
<?php echo $before_widget; ?>
<?php if ( $title )
echo $before_title . $title . $after_title; ?>
<?php
global $post;
$tmp_post = $post;
// get the category IDs and place them in an array
$args = 'numberposts=' . $number . '&offset=' . $offset . '&post_type=' . $posttype . '&cat=' . $cat;
$myposts = get_posts( $args );
foreach( $myposts as $post ) : setup_postdata($post); ?>
<div id="cs-background" style="border: 5px solid white; background:url(<?php echo (CHEER_PLUGIN_URL); ?>/timthumb/timthumb.php?src=<?php echo get_post_meta($post->ID, 'nitro_post_image', true) ?>&w=270&h=157&zc=1) no-repeat;">
<div class="cs-audio">
<audio style="width:270px; margin:115px 0 0 0;" controls="controls">
<source src="<?php echo get_post_meta($post->ID, 'song-sample', true) ?>" type="audio/mp3" />
<object type="application/x-shockwave-flash" data="<?php echo (CHEER_PLUGIN_URL); ?>/dewplayer/dewplayer-mini.swf" width="266" height="20" id="dewplayer" name="dewplayer">
<param name="wmode" value="transparent" />
<param name="movie" value="dewplayer-mini.swf" />
<param name="flashvars" value="mp3=<?php echo get_post_meta($post->ID, 'song-sample', true) ?>" />
</object>
</audio>
</div>
</div>
<div>
<?php the_title( '<h2 id="mix-title" class="post-title entry-title"><a href="' . get_permalink() . '" title="' . the_title_attribute( 'echo=0' ) . '" rel="bookmark">', '</a></h2>' ); ?>
<!-- <h2 id="cs-title" class="post-title entry-title">
<?php if($thumbnail == true) { ?>
<?php the_post_thumbnail(array($thumbnail_size));?>
<?php } ?>
<?php the_title(); ?>
</h2>
<?php the_content(); ?> -->
</div>
<?php endforeach; ?>
<?php $post = $tmp_post; ?>
<?php echo $after_widget; ?>
<?php
}
/** @see WP_Widget::update */
function update($new_instance, $old_instance) {
global $posttypes;
global $cats;
$instance = $old_instance;
$instance['title'] = strip_tags($new_instance['title']);
$instance['cat'] = $new_instance['cat'];
$instance['number'] = strip_tags($new_instance['number']);
$instance['offset'] = strip_tags($new_instance['offset']);
$instance['thumbnail_size'] = strip_tags($new_instance['thumbnail_size']);
$instance['thumbnail'] = $new_instance['thumbnail'];
$instance['posttype'] = $new_instance['posttype'];
return $instance;
}
/** @see WP_Widget::form */
function form($instance) {
$posttypes = get_post_types('', 'objects');
$cats = get_categories('hide_empty=0');
$title = esc_attr($instance['title']);
$cat = esc_attr($instance['cat']);
$number = esc_attr($instance['number']);
$offset = esc_attr($instance['offset']);
$thumbnail_size = esc_attr($instance['thumbnail_size']);
$thumbnail = esc_attr($instance['thumbnail']);
$posttype = esc_attr($instance['posttype']);
?>
<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 $title; ?>" />
</p>
<p>
<label for="<?php echo $this->get_field_id('cat'); ?>"><?php _e('Category you want to use'); ?></label>
<select name="<?php echo $this->get_field_name('cat'); ?>" id="<?php echo $this->get_field_id('cat'); ?>" class="widefat" />
<?php
foreach ($cats as $catsoption) {
echo '<option value="' . $catsoption->cat_ID . '" id="' . $catsoption->name . '"', $cat == $catsoption->cat_ID ? ' selected="selected"' : '', '>', $catsoption->name, '</option>';
}
?>
</select>
</p>
<p>
<label for="<?php echo $this->get_field_id('number'); ?>"><?php _e('Number to Show:'); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo $number; ?>" />
</p>
<p>
<label for="<?php echo $this->get_field_id('number'); ?>"><?php _e('Offset (the number of posts to skip):'); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('offset'); ?>" name="<?php echo $this->get_field_name('offset'); ?>" type="text" value="<?php echo $offset; ?>" />
</p>
<p>
<input id="<?php echo $this->get_field_id('thumbnail'); ?>" name="<?php echo $this->get_field_name('thumbnail'); ?>" type="checkbox" value="1" <?php checked( '1', $thumbnail ); ?>/>
<label for="<?php echo $this->get_field_id('thumbnail'); ?>"><?php _e('Display thumbnails?'); ?></label>
</p>
<p>
<label for="<?php echo $this->get_field_id('thumbnail_size'); ?>"><?php _e('Size of the thumbnails, e.g. <em>80</em> = 80px x 80px'); ?></label>
<input class="widefat" id="<?php echo $this->get_field_id('thumbnail_size'); ?>" name="<?php echo $this->get_field_name('thumbnail_size'); ?>" type="text" value="<?php echo $thumbnail_size; ?>" />
</p>
<p>
<label for="<?php echo $this->get_field_id('posttype'); ?>"><?php _e('Choose the Post Type to display'); ?></label>
<select name="<?php echo $this->get_field_name('posttype'); ?>" id="<?php echo $this->get_field_id('posttype'); ?>" class="widefat">
<?php
foreach ($posttypes as $option) {
echo '<option value="' . $option->name . '" id="' . $option->name . '"', $posttype == $option->name ? ' selected="selected"' : '', '>', $option->name, '</option>';
}
?>
</select>
</p>
<?php
}
} // class utopian_recent_posts
// register Recent Posts widget
add_action('widgets_init', create_function('', 'return register_widget("cheer_recent_posts");'));