Reply To: Can I sync ACF fields AND values using local JSON?

• John Huebner

• October 2, 2019 at 10:27 pm

What that does is just use a default. What you want to do is use a value from a different site if not set on the current site.

What I would do it create an acf/load_value filter for each field, you may be able to use a single filter for multiple fields. You can even use this to update the value that are missing.

// example for text field
$text_fields = array(
  // list of field keys
  'field_1234',
  'field_4321'
);
foreach ($text_fields as $key) {
  add_filter('acf/load_field/key='.$key, 'load_text_field_from_master_site', 20, 3);
}
function load_text_field_from_master_site($value, $post_id, $field) {
  if ($post_id != 'options') { // or your appropriate ID
    // only for an options page
    return $value;
  }
  if (!empty($value)) {
    // field has a value
    return $value;
  }
  
  // get value from master site
  switch_to_blog(1); // or the ID of your master site
  $value = get_field($field['name'], $post_id);
  restore_current_blog();
  
  // update value on current site
  update_field($field['key', $value, $post_id);

  // return the value
  return $value;
}