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Hopefully a simple question. I've added several post thumbnail sizes to functions.php using add_image_size. They are each named exactly like a post category. I would like to find a way of making each post call the specific thumbnail size assigned to it's category.

The best way I can imagine doing it is by inserting the category name into the thumbnail string like so:

<?php the_post_thumbnail( 'INSERT CATEGORY NAME HERE' ); ?>

What could I put in this php string to make it insert the category's name into this?

Thank you.

  • 2
    The problem with this, if it does work, is that you can assign multiple categories to a post. So you're either going to have to enforce a single category policy on all your posts or you will have to pull out the first key of an array. – Cedon Jun 5 '17 at 23:55
  • I didn't think of that. I suppose an array is something i'd have to factor in too. Or if possible, for it to just detect one of the 3 possible categories I was going to assign different size thumbnails too. – mastercoeurl Jun 6 '17 at 0:44
  • The thing is though, it's always going to look for the [0] key. So if you assign it category 1 and category 2, it will use 1's thumbnail always. – Cedon Jun 6 '17 at 0:53
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As @belinus mentioned, you can assign multiple categories to a post, so you have to decide which one to pass to the_post_thumbnail().

One approach would be to use get_the_category(), which returns an array, then grabbing the first result from that function as your thumbnail size:

$categories    = get_the_category();
$thumbnail_cat = ! empty( $categories[0]->slug ) ? $categories[0]->slug : '';

the_post_thumbnail( $thumbnail_cat );
  • Hmm if I add this into a php tag it gives me this error: Warning: Illegal offset type in isset or empty in /srv/users/serverpilot/apps/zwp/public/wp-includes/media.php on line 747 Recoverable fatal error: Object of class WP_Term could not be converted to string in /srv/users/serverpilot/apps/zwp/public/wp-includes/media.php on line 884 – mastercoeurl Jun 6 '17 at 1:27
  • Oops, I missed that get_the_category() returns an array of WP_Term objects and not slugs. I've updated my answer to look for the term slug for the $thumbnail_cat string. – Morgan Estes Jun 6 '17 at 1:50
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    That fixed it! It's all working perfectly now. Thank you so much. You cleared up a big headache for me. – mastercoeurl Jun 6 '17 at 2:03

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