Reply To: Automatically fill image field with post_thumbnail

• John Huebner

• February 21, 2015 at 4:42 pm

Just after the post is saved

function add_image_to_acf_field($post_id) {
  if (has_post_thumbnail($post_id)) {
    $post_thumbnail_id = get_post_thumbnail_id($post_id);
    // notice that I'm using the field key here
    update_field('field_4fc5ab37e1819lol', $post_thumbnail_id, $post_id');
  }
}
add_action('save_post', 'add_image_to_acf_field');