<?php function post_meta() {
	if (is_single()){
	if (have_posts()) {
		while (have_posts()) {
			the_post();
			$postid = $post->ID;
			$posttags = get_the_tags($postid);
			foreach((get_the_category($postid)) as $category) { 
				    echo $category->cat_name . ' '; 
				} 
			if ($posttags) {echo " 标签:";
				foreach($posttags as $tag) {echo$tag->name . ' '; }
					}
				}
			}
		}
}
?>