WordPress文章末尾实现历史上的今天

WordPress主题中找到functions.php，然后呢加入以下方法，代码如下：

//~ 历史上的今天，代码来自柳城博主的 WP-Today 插件
function today_in_history() {
 
	$title = "历史上的今天"; // 标题
	$limit = 5; // 列表显示的数量，默认5条数据
 
	global $wpdb;
	$post_year = get_the_time('Y');
	$post_month = get_the_time('m');
	$post_day = get_the_time('j');
 
	$sql = "select ID, year(post_date_gmt) as h_year, post_title, comment_count FROM 
			$wpdb->posts WHERE post_password = '' AND post_type = 'post' AND post_status = 'publish'
			AND year(post_date_gmt)!='$post_year' AND month(post_date_gmt)='$post_month' AND day(post_date_gmt)='$post_day'
			order by post_date_gmt DESC limit $limit";
	$histtory_post = $wpdb->get_results($sql);
	if( $histtory_post ){
		foreach( $histtory_post as $post ){
			$h_year = $post->h_year;
			$h_post_title = $post->post_title;
			$h_permalink = get_permalink( $post->ID );
			$h_comments = $post->comment_count;
			$h_post .= "<li>$h_year:&nbsp;&nbsp;<a href='".$h_permalink."' title='查看： ".$h_post_title."'>$h_post_title <span>($h_comments 评)</span></a></li>";
		}
	}
 
	if ( $h_post ){
		$result = "<section class='history-in-today'><p><strong>".$title."</strong></p><div><ul>".$h_post."</ul></div></section>";
	} else {
		$result = "<section class='history-in-today'><p><strong>".$title."</strong></p><div>很遗憾~，历史上的今天未发表过文章</div></section>";
	}
 
	return $result;
}

然后刷新就会看到效果了，如果曾经未发布过文章，会提示：“很遗憾~，历史上的今天未发表过文章”，反之则显示文章列表，样式自行调整吧！