Reply To: Dynamically set front page featured image from first image in latest post's ACF

• John Huebner

• January 3, 2019 at 10:59 am

When working with ACF it is almost always best to use use acf/save_post https://www.advancedcustomfields.com/resources/acf-save_post/. There is no guarantee that ACF will have saved values using WP save_post hook.

add_action('acf/save_post', 'set_home_featured_image_from_ACF_gallery');
function set_home_featured_image_from_ACF_gallery($post_id) {
  // still need to do this
  $recent_posts = wp_get_recent_posts(array( 'numberposts' => '1'));
  if ($post_id != $recent_posts[0]->ID) {
    // this post is not the most recent post
    return;
  }
  $frontpage_id = get_option('page_on_front');
  $images = get_field('surf_report_gallery', $post_id, false);
  $image_id = 0;
  if (!empty($images)) {
    $image_id = $images[0];
  } else {
    // backup, use the post featured image?
    $image_id = get_post_thumbnail_id($post_id);
  }
  if ($image_id) {
    // remove the if statement if you want to remove the feature image
    // if a new image is not found
    set_post_thumbnail($frontpage_id, $image_id);
  }
}