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I am 90% done building a plugin that uses the Amazon.com API. What I have built is a Books Custom Post Type.

My Books CPT has Custom Taxonomies for Book Category, Book Tags, Book Author, and Book Publisher/company

I then have a Settings page that allows you to Import a list of Books from Amazon using there API, you insert the ASIN ID number, 1 per line in a textarea field and then I import each book as a Book CPT and assign the custom taxonomies listed above.

The only thing I am missing at this point is the ability to upload the image that is returned from the Amazon API, I get a URL to the image. I need to upload the image and assign it as the Featured Image for the post it is creating.

I have not been able to find a solution for this yet, can anyone help with some code to upload an image in WordPress from a URL and then assign it as a featured image to a post?

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I have it working now, I had tried this code below before posting this question but I was missing the Post ID to assign it to so I just realized that and fixed it and it does work now!

Here is the code just in case it helps someone else in the future...

  $photo_name = 'testimagename';
  $newId = $post_id;

  // Set Featured Image
  $photo = new WP_Http();
  $photo = $photo->request( $image_url );
  $attachment = wp_upload_bits( $photo_name . '.jpg', null, $photo['body'], date("Y-m", strtotime( $photo['headers']['last-modified'] ) ) );

  $filetype = wp_check_filetype( basename( $attachment['file'] ), null );

  $postinfo = array(
      'post_mime_type'    => $filetype['type'],
      'post_title'        => $title . ' ',
      'post_content'  => '',
      'post_status'   => 'inherit',
  );
  $filename = $attachment['file'];
  $attach_id = wp_insert_attachment( $postinfo, $filename, $newId );
  if( !function_exists( 'wp_generate_attachment_data' ) )
      require_once(ABSPATH . "wp-admin" . '/includes/image.php');
  $attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
  wp_update_attachment_metadata( $attach_id,  $attach_data );
  set_post_thumbnail($post_id,$attach_id);

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