<?php 
	get_previous_post( boolean $in_same_cat, string $excluded_categories )
?>

WP_Post Object ( 
	[ID] => 214 //文章ID
	[post_author] => 1 //文章作者ID
	[post_date] => 2021-05-28 01:49:49 //文章发布服务器时间
	[post_date_gmt] => 2021-05-28 17:49:49 //文章发布的格林威治时间
	[post_content] => 专注分享zblog,wordpress,织梦dedecms模板主题教程资源！ //文章内容 
	[post_title] => 博客吧 //文章标题
	[post_excerpt] =>  //文章摘要
	[post_status] => publish //文章状态
	[comment_status] => open //文章评论状态
	[ping_status] => closed //文章Ping状态
	[post_password] => //文章密码
	[post_name] => boke8 //文章别名 
	[to_ping] => //被Ping的
	[pinged] => //已Ping的
	[post_modified] => 2017-09-24 01:49:49 
	[post_modified_gmt] => 2017-09-23 17:49:49 
	[post_content_filtered] => //过滤后的文章内容
	[post_parent] => 0 //文章父级ID
	[guid] => https://www.boke8.net/?p=1 //文章唯一标识符，文章原始URL
	[menu_order] => 0 //菜单排序
	[post_type] => post //文章类型
	[post_mime_type] => //文章mime类型
	[comment_count] => 0 //文章评论数量
	[filter] => raw //过滤器信息
)

<?php 
	$prevPost = get_previous_post();
	echo $prevPost->ID;
?>

<?php 
	$prevPost = get_previous_post(true);
	print_r($prevPost);
?>