代码如下，用了substr截取文章前220个字符作为description，关键词keywords采用标签填充，则分类采用分类描述：
<?php
if (is_home()){
$description = "胡立业,争做“小胡”搜索引擎第一,知识收集,影音分享,搞怪娱乐,资源下载,热点追踪,生活记录";
$keywords = "小胡,pjblog,wordpress,windows7 sp1";
}
elseif (is_single()){
if ($post->post_excerpt) {
$description = $post->post_excerpt;
}
elseif( function_exists('substr')){
$description = substr(strip_tags($post->post_content),0,220);
}
else {
$description = $post->post_title;
}
$keywords = "胡立业";
$tags = wp_get_post_tags($post->ID);
foreach ($tags as $tag ) {
$keywords = $keywords . "," . $tag->name;
}
}
elseif(is_category()){
$description = category_description();
}
echo "<meta name="keywords" content="$keywords" />
<meta name="description" content="$description" />";
?>