Wordpress - How to retrieve image from URL and set as featured image/post thumbnail

My favorite way of handling this problem has been to use a little documented function I discovered on another stack post: media_sideload_image

It works by fetching an image url to the WordPress upload dir and then associating the image to a post's attachments.

You can try it like so:

// required libraries for media_sideload_image
require_once(ABSPATH . 'wp-admin/includes/file.php');
require_once(ABSPATH . 'wp-admin/includes/media.php');
require_once(ABSPATH . 'wp-admin/includes/image.php');

// $post_id == the post you want the image to be attached to
// $video_thumb_url == the vimeo video's thumb url
// $description == optional description

// load the image
$result = media_sideload_image($video_thumb_url, $post_id, $description);

// then find the last image added to the post attachments
$attachments = get_posts(array('numberposts' => '1', 'post_parent' => $post_id, 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC'));


if(sizeof($attachments) > 0){
    // set image as the post thumbnail
    set_post_thumbnail($post_id, $attachments[0]->ID);
}  

Hi @David John Smith:

1.) If you are in WordPress, (almost) always use WP_Http; it's one of the many things I love about working with WordPress. Why call it and not CURL? Well, because it has a nicer syntax and it calls CURL if CURL is available. If not, it chooses from one of 3 other options. So it really is a brilliant piece of kit.

2.) To answer the 2nd question I'll need to know how you want to name the files you are downloading?