今天和同事在使用 WP_Query 的 post__in 參數(shù)的時(shí)候：

$like_query = new WP_Query(array(
	'post_type'	=> array('post','event'),
	'post__in'	=> array(138,139),
	'orderby'	=> 'post__in',
	'posts_per_page'=> -1
) );

但是返回的結(jié)果總是超過這個(gè) 138, 139 這兩篇，甚是奇怪。后面仔細(xì)查看文檔，才發(fā)現(xiàn)有如下這段話：

ATTENTION If you use sticky posts, they will be included (prepended!) in the posts you retrieve whether you want it or not. To suppress this behaviour use ignore_sticky_posts.

原來如此，我又正好使用了 sticky posts，置頂文章，所以，哎，調(diào)試了整整好幾個(gè)小時(shí)，都把 WP 源代碼翻爛了。

所以最終的代碼應(yīng)該是：

$like_query = new WP_Query(array(
	'post_type'		=> array('post','event'),
	'post__in'		=> array(138,139),
	'orderby'		=> 'post__in',
	'posts_per_page'	=> -1,
	'ignore_sticky_posts'	=> 1
) );