为WordPress分类添加选择不同模板选项

// 分类选择模板
class Select_Category_Template{
	public function __construct() {
		add_filter( 'category_template', array($this,'get_custom_category_template' ));
		add_action ( 'edit_category_form_fields', array($this,'category_template_meta_box'));
		add_action( 'category_add_form_fields', array( &$this, 'category_template_meta_box') );
		add_action( 'created_category', array( &$this, 'save_category_template' ));
		add_action ( 'edited_category', array($this,'save_category_template'));
		do_action('Custom_Category_Template_constructor',$this);
	}

	// 添加表单到分类编辑页面
	public function category_template_meta_box( $tag ) {
		$t_id = $tag->term_id;
		$cat_meta = get_option( "category_templates");
		$template = isset($cat_meta[$t_id]) ? $cat_meta[$t_id] : false;
		?>
		<tr class="form-field">
			<th scope="row" valign="top"><label for="cat_Image_url"><?php _e('Category Template'); ?></label></th>
			<td>
				<select name="cat_template" id="cat_template">
					<option value='default'><?php _e('Default Template'); ?></option>
					<?php page_template_dropdown($template); ?>
				</select>
				<br />
				<span class="description"><?php _e('为此分类选择一个模板'); ?></span>
			</td>
		</tr>
		<?php
		do_action('Custom_Category_Template_ADD_FIELDS',$tag);
	}

	// 保存表单
	public function save_category_template( $term_id ) {
		if ( isset( $_POST['cat_template'] )) {
			$cat_meta = get_option( "category_templates");
			$cat_meta[$term_id] = $_POST['cat_template'];
			update_option( "category_templates", $cat_meta );
			do_action('Custom_Category_Template_SAVE_FIELDS',$term_id);
		}
	}

	// 处理选择的分类模板
	function get_custom_category_template( $category_template ) {
		$cat_ID = absint( get_query_var('cat') );
		$cat_meta = get_option('category_templates');
		if (isset($cat_meta[$cat_ID]) && $cat_meta[$cat_ID] != 'default' ){
			$temp = locate_template($cat_meta[$cat_ID]);
			if (!empty($temp))
				return apply_filters("Custom_Category_Template_found",$temp);
		}
		return $category_template;
	}
}

$cat_template = new Select_Category_Template();