Comments on: WordPress Post Thumbnails: Migrating from Custom Fields to the Featured Image API

By: Matt

Matt — Tue, 19 Jun 2012 20:08:05 +0000

Thanks. I love my blog, too.

I end up digging through the source when I have to, but for simpler things I often end up reinventing the wheel instead…

By: Johan Ahlback

Johan Ahlback — Mon, 18 Jun 2012 06:17:27 +0000

I always look at the source code when i want to modify something. There’s always some filters or action hooks you didn’t know about. Btw, love your blog.

By: Matt

Matt — Fri, 15 Jun 2012 04:54:22 +0000

That’s good. I didn’t know about that filter…

By: Johan Ahlback

Johan Ahlback — Mon, 11 Jun 2012 12:15:25 +0000

Nice article! But not the way i would solve this problem. You should use a filter so you can use get_the_post_thumbnail and has_post_thumbnail. This should work:

add_filter(‘post_thumbnail_html’, ‘if_thumbnail’ , 10, 5);
function if_thumbnail($html, $post_id, $post_thumbnail_id, $size, $attr){
global $post;
$thumbnail = get_post_meta($post->ID, ‘thumbnail’, true);
if(!$thumbnail)
return $html;
return ‘';
}