Reply To: Using first gallery image as the featured image…

• aaron91brimacombe

• June 25, 2020 at 7:04 am

Thanks for your reply John.

I managed to make this work with the following code:

add_filter('acf/save_post', 'gallery_to_thumbnail',11,11);
function gallery_to_thumbnail($post_id) {
$gallery = get_field('images', $post_id, false);
var_dump($gallery);
var_dump($post_id);

if (!empty($gallery)) {

$image_id = $gallery[0];

set_post_thumbnail($post_id, $image_id);

}

I realised my issue isn’t with setting the featured image but setting the og:image based on the featured image for which I am using Yoast plugin. This only works once I update a post rather than create one.

I know Yoast has a filter but I am unsure how to set it using the gallery field, any ideas would be greatly appreciated:

add_filter('wpseo_opengraph_image', 'og_image');
 
function og_image($image) {
    global $post;
 
    if (get_field('feature_image', $post->ID)) {
        $image = base_image_url(get_field('feature_image', $post->ID), null); 
    }
    return $image;
}