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You need to create either an acf/pre_save_post or an acf/save_post filter. Since you’re using the built in acf/pre_save_post filter I would go with an acf/save_post filter.
add_action('acf/save_post', 'update_setups_2019_title');
function update_setups_2019_title($post_id) {
if (get_post_type($post_id) != 'update_setups_2019')
// only run on your post type
return;
}
// get the post
$post = get_post($post_id);
// update the post title
$post->post_title = get_field('field-one').' '.get_field('field-two'); // etc..
// correct the slug.. optional and I don't know that this is 100% correct
$slug = sanitize_title($post->title);
$post->post_name = wp_unique_post_slug($slug, $post->ID, $post->post_status, $post->post_type, $post->post_parent);
// remove this filter to prevent infinite loop
remove_filter('acf/save_post', 'update_setups_2019_title');
// update the post
wp_update_post($post);
// re-add this filter
add_action('acf/save_post', 'update_setups_2019_title');
}
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