wordpress的meta优化-Description和Keywords

<?if (is_home()){
    $description = "wordpress-Ing是一个介绍wordpress相关的博客,他的意图是收集blogger们需要的皮肤,推荐您更好的插件和一些代码改进.";
    $keywords = "WordPress, 博客, 互联网, 主题, 插件, 代码, blogger";
} elseif (is_single()){
    if ($post->post_excerpt) {
        $description     = $post->post_excerpt;
    } else {
        $description = substr(strip_tags($post->post_content),0,220);
    }
 
    $keywords = "";       
    $tags = wp_get_post_tags($post->ID);
    foreach ($tags as $tag ) {
        $keywords = $keywords . $tag->name . ", ";
    }
}
?>
<meta name="keywords" content="<?=$keywords?>" />
<meta name="description" content="<?=$description?>" />