So fügen Sie WordPress-Kategorien die Option „Andere Vorlage auswählen' hinzu

<?php
/*
Template Name: 模板A
*/

// 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(&#39;Category Template&#39;); ?></label></th>
			<td>
				<select name="cat_template" id="cat_template">
					<option value=&#39;default&#39;><?php _e(&#39;Default Template&#39;); ?></option>
					<?php page_template_dropdown($template); ?>
				</select>
				<br />
				<span class="description"><?php _e(&#39;为此分类选择一个模板&#39;); ?></span>
			</td>
		</tr>
		<?php
		do_action(&#39;Custom_Category_Template_ADD_FIELDS&#39;,$tag);
	}
 
	// 保存表单
	public function save_category_template( $term_id ) {
		if ( isset( $_POST[&#39;cat_template&#39;] )) {
			$cat_meta = get_option( "category_templates");
			$cat_meta[$term_id] = $_POST[&#39;cat_template&#39;];
			update_option( "category_templates", $cat_meta );
			do_action(&#39;Custom_Category_Template_SAVE_FIELDS&#39;,$term_id);
		}
	}
 
	// 处理选择的分类模板
	function get_custom_category_template( $category_template ) {
		$cat_ID = absint( get_query_var(&#39;cat&#39;) );
		$cat_meta = get_option(&#39;category_templates&#39;);
		if (isset($cat_meta[$cat_ID]) && $cat_meta[$cat_ID] != &#39;default&#39; ){
			$temp = locate_template($cat_meta[$cat_ID]);
			if (!empty($temp))
				return apply_filters("Custom_Category_Template_found",$temp);
		}
		return $category_template;
	}
}
 
$cat_template = new Select_Category_Template();