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I'm using the excellent PHP Code Widget plugin, and want to create a widget that displays the post thumbnail (aka featured image) for the most recent 'project' post. Here's the code I have so far, but it isn't producing the desired result. This actually outputs nothing.

global $post;
$args = array(
    'post_type' => 'project',
    'posts_per_page' => 1,
$thumbnails = get_posts($args);
foreach ($thumbnails as $post)
        <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail( 'thumbnail' ); ?></a>

Any suggestions on what I need to change for this to work?

share|improve this question
Nothing like not even empty markup for link tag? Had you checked that post is returned at all and $thumbnails is not empty? – Rarst Dec 8 '10 at 20:08
Correct, nothing at all. What is the best way to check $thumbnails? If I use "print_r($thumbnails);", I get "Array ( )" as the output. – tnorthcutt Dec 8 '10 at 20:30
Turns out I wasn't using the correct slug for the post type. It should have been 'projects'. Thanks for the suggestion to check $thumbnails, that's what got me thinking about why it was empty. It works now, except I get three featured images, instead of the 1 I expected. Any thoughts? – tnorthcutt Dec 8 '10 at 20:34
up vote 3 down vote accepted

Moving here so comments don't turn into a mess.

Basically there are two things that can go wrong here:

  1. Fetching of posts. Check that $thumbnails gets correct post and only one. I am not sure if that is the issue, but get_posts() docs list numberposts argument instead of posts_per_page that is listed for query_posts(). That might make a difference.

  2. Messing with global variables. For this usage I wouldn't touch global $post at all, directly or with setup_postdata() either. Just use non-loop versions of functions that can fetch things you need by post id - get_permalink() and get_the_post_thumbnail().

share|improve this answer
Using numberposts did indeed fix it. Interesting, since the Codex says that get_posts() "can also take the parameters that query_posts() can". I think I understand #2 - I'll see if I can successfully re-write it and come back if that doesn't work out. Thanks for the help! – tnorthcutt Dec 8 '10 at 22:02
Yeah, most of the time query_posts() and get_posts() are identical. But they do have some differences in internals and default arguments, so I try to stick with what docs say when arguments do seemingly same thing. – Rarst Dec 8 '10 at 22:06
Just FYI, looks like this has been fixed: core.trac.wordpress.org/ticket/15150 – tnorthcutt Dec 8 '10 at 22:53

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