WordPress给分类和标签增加自定义字段的教程代码

<?php 

function boke8_net_add_category_field(){

	echo '<div class="form-field">

			<label for="tag-title">自定义标题</label>

			<input name="tag-title" id="tag-title" type="text" value="" size="40">

			<p>请在此输入用于SEO优化的标题。</p>

		  </div>';	

	echo '<div class="form-field">

			<label for="tag-keywords">自定义关键词</label>

			<input name="tag-keywords" id="tag-keywords" type="text" value="" size="40">

			<p>请在此输入用于SEO优化的关键词。</p>

		  </div>';		  

	echo '<div class="form-field">

			<label for="tag-description">自定义描述</label>

			<textarea name="tag-description" id="tag-description" class="large-text" rows="5" cols="50"></textarea>

			<p>请在此输入用于SEO优化的关键词。</p>

		  </div>';		  

}

function boke8_net_edit_category_field($tag){

	echo '<tr class="form-field">

			<th scope="row"><label for="tag-title">自定义标题</label></th>

			<td>

				<p><input name="tag-title" id="tag-title" type="text" value="';

				echo get_option('_category_title'.$tag->term_id).'" size="40"/></p>

				<p class="description">请在此输入用于SEO优化的标题。</p>

			</td>

		</tr>';

	echo '<tr class="form-field">

			<th scope="row"><label for="tag-keywords">自定义关键词</label></th>

			<td>

				<p><input name="tag-keywords" id="tag-keywords" type="text" value="';

				echo get_option('_category_keywords'.$tag->term_id).'" size="40"/></p>

				<p class="cat-url">请在此输入用于SEO优化的关键词。</p>

			</td>

		</tr>';	

	echo '<tr class="form-field">

			<th scope="row"><label for="tag-description">自定义描述</label></th>

			<td>

				<p><textarea name="tag-description" id="tag-description" class="large-text" rows="5" cols="50">'.get_option('_category_description'.$tag->term_id).'</textarea></p>

				<p class="cat-url">请在此输入用于SEO优化的描述。</p>

			</td>

		</tr>';		

}

function boke8_net_taxonomy_metadate($term_id){

	if(isset($_POST['tag-title']) && isset($_POST['tag-keywords']) && isset($_POST['tag-description'])){

		if(!current_user_can('manage_categories')){

			return $term_id;

		}

		$title_key = '_category_title'.$term_id; // key 选项名为 cat-tel-1 类型

		$title_value = $_POST['tag-title'];	// value

		$word_key = '_category_keywords'.$term_id;

		$word_value = $_POST['tag-keywords'];

		$desc_key = '_category_description'.$term_id;

		$desc_value = $_POST['tag-description'];		

		update_option( $title_key, $title_value ); 

		update_option( $word_key, $word_value );

		update_option( $desc_key, $desc_value );

	}

} 

add_action('category_add_form_fields','boke8_net_add_category_field',10,2);

add_action('category_edit_form_fields','boke8_net_edit_category_field',10,2);

add_action('created_category','boke8_net_taxonomy_metadate',10,1);

add_action('edited_category','boke8_net_taxonomy_metadate',10,1);

add_action( 'post_tag_add_form_fields', 'boke8_net_add_category_field',10,2);  

add_action( 'post_tag_edit_form_fields', 'boke8_net_edit_category_field',10,2);  

add_action( 'edited_post_tag', 'boke8_net_taxonomy_metadate',10,1);  

add_action( 'create_post_tag', 'boke8_net_taxonomy_metadate',10,1);

?>

echo get_option('_category_title'.get_queried_object_id());

echo get_option('_category_keywords'.get_queried_object_id());

echo get_option('_category_description'.get_queried_object_id());