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I'm dynamically creating a custom post type in code (not in the editor) and I have an image I want to attach to my custom post type as a post thumbnail, and have it resized, etc. How do I do that. I'm successfully creating the custom post type using wp_insert_post().

I've looked at wp_save_image(), wp_save_image_file(), load_image_to_edit(), get_attached_file() and others, but they all seem to require an image in $_POST. I also looked at wp_insert_attachment() and update_attached_file() which seemed promising, but were not image centric.

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WP 3.1 introduces set_post_thumbnail() function, that sets attachment (that you will need to create first, you seem to be on right track with wp_insert_atachment()) as thumbnail for the post.

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  • thanks the codex page you referenced for wp_insert_attachment() provided an excellent example. I used to only read codex pages, then recently I started to just read the core code - I guess both are the the best!
    – dwenaus
    Jun 1, 2011 at 7:08
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Unfortunately I don't think you can with wp_insert_post, but you can add the images' URL in the custom field.

update_post_meta( $post_id,'image_url',$image_url);

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