WordPressのタグ一覧を作成する

/**
 * Tags widget class
 */
class WP_Widget_Tags extends WP_Widget {

	function __construct() {
		$widget_ops = array( 'classname' => 'widget_tags', 'description' => __( "A list of tags" ) );
		parent::__construct('tags', __('Tags'), $widget_ops);
	}

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

		$title = apply_filters('widget_title', empty( $instance['title'] ) ? __( 'Tags' ) : $instance['title'], $instance, $this->id_base);

		echo $before_widget;
		if ( $title )
			echo $before_title . $title . $after_title;

		echo "<ul>";
		$tag_all = get_terms("post_tag", "fields=all");
		foreach($tag_all as $value){
			$url = home_url() . "/archives/tag/" . $value->slug;
			echo "<li><a href=\"". $url ."\">" . $value->name . "<span class=\"count\">(" . $value->count . ")" . "</span></a></li>";
		}
		echo "</ul>";

		echo $after_widget;
	}

	function update( $new_instance, $old_instance ) {
	}

	function form( $instance ) {
	}

}
// register WP_Widget_Tags widget
add_action('widgets_init', 	create_function('', 'return register_widget("WP_Widget_Tags");'));