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我創建了一個搜索表單和search.php文件來顯示結果。唯一的是，我想過濾包括標籤，而不是內容和標題。這個過程有沒有wordpress功能？如何按類別和標籤過濾WordPress結果？
搜索表單代碼：
<?php if(is_category(array('general-support','activities','discount-cards','equipment','financial','holidays','medical','respite')) || is_single()){?>
<div style="width:auto; margin:0px 40px 0px 20px;">
<form role="search" action="<?php bloginfo('siteurl');?>" style="margin:0px; padding:0px;">
<div>
<h2>Search for</h2>
<div><input type="text" name="s" id="s" style="width:100%; padding:5px; border:1px solid #ccc; box-shadow:inset 1px 1px 1px #f0f0f0;" /></div>
<div><input type="hidden" value="14,16,21,18,20,15,22,19,17" name="cat" id="scat" /></div>
</div>
</form>
</div>
<?php } ?>
的search.php
<?php query_posts($query_string . '&showposts=10'); ?>
<?php if (have_posts()) : ?>
<?php $post = $posts[0]; // Hack. Set $post so that the_date() works. ?>
<?php while (have_posts()) : the_post(); ?>
<div <?php post_class() ?> id="post-<?php the_ID(); ?>">
<div class="entry">
<!--start.entry-wrapper-->
<div class="entry-wrapper">
<!--start.post-thumbnail-->
<?php if(has_post_thumbnail()){?>
<div class="post-thumbnail-wrapper">
<a href="<?php the_permalink();?>">
<?php the_post_thumbnail('category-thumb'); ?>
</a>
</div>
<?php } ?>
<!--end.post-thumbnail-->
<!--start.post-entry--->
<div class="post-enry-wrapper">
<h2><a href="<?php the_permalink(); ?>" title="<?php printf(esc_attr__('Permalink to %s', 'udesign'), the_title_attribute('echo=0')); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
<div class="postmetadata">
<?php the_content();?>
</div>
</div>
<!--end.post-entry-->
<div class="clear"></div>
</div>
<!--end.entry-wrapper-->
</div>
<?php if(!is_category() && !is_single()){?>
<div><?php if(function_exists('kc_add_social_share')) kc_add_social_share(); ?></div>
<?php }?>
</div>
<div class="addGap"></div>
<?php endwhile; ?>
<div class="clear"></div>
<?php // Pagination
if(function_exists('wp_pagenavi')) :
wp_pagenavi();
else : ?>
<div class="navigation">
<div class="alignleft"><?php previous_posts_link() ?></div>
<div class="alignright"><?php next_posts_link() ?></div>
</div>
<?php endif; ?>
請指教，我不喜歡使用任何插件。