Reply To: Feature image from first gallery image

• John Huebner

• July 18, 2018 at 9:41 pm

I just created a gallery field simply named “gallery” and added this simple function

add_filter('acf/save_post', 'gallery_to_thumbnail');
function gallery_to_thumbnail($post_id) {
	$gallery = get_field('gallery', $post_id, false);
	if (!empty($gallery)) {
		$image_id = $gallery[0];
		set_post_thumbnail($post_id, $image_id);
	}
}

This works, the first image in the gallery is set as the featured image when I save as a draft or I when I publish.