Wordpress function to upload image and set as featured image


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A function to upload an image to the media library and set it as featured image of a post. It requires 2 params. The name of the upload field and of course the post ID.

This function is part of the WPelements library class available on Github. Feedback / suggestions / improvements are always welcome.


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  1. /**
  2. * Function to upload an image to the media library and set it as the featured image of a post
  3. * @param string Name of the upload field
  4. * @param int ID of the post
  5. * @return string
  6. * */
  7. public function set_featured_image($file, $post_id){
  8. require_once(ABSPATH . "wp-admin" . '/includes/image.php');
  9. require_once(ABSPATH . "wp-admin" . '/includes/file.php');
  10. require_once(ABSPATH . "wp-admin" . '/includes/media.php');
  11. $attachment_id = media_handle_upload($file, $post_id);
  12. update_post_meta($post_id, '_thumbnail_id', $attachment_id);
  13. $attachment_data = array(
  14. 'ID' => $attachment_id
  15. );
  16. wp_update_post($attachment_data);
  17. return $attachment_id;
  18. }

URL: https://github.com/krike/WPelements

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