Home Forums Bug Reports ACF Repeater sub-fields are losing / swapping content when re-ordered Reply To: ACF Repeater sub-fields are losing / swapping content when re-ordered

  • This has not been completely tested and may cause timeout issue if used with options pages or excessive numbers of fields. There may be other conditions where it causes problems that I’m not aware of.

    step 1, create this function

    // this function with the help of 
    // @gabriel dot sobrinho at gmail dot com
    function acf_array_merge_recursive_distinct(array &$array1, array &$array2) {
      $merged = $array1;
      foreach ($array2 as $key => &$value) {
        if (is_array($value) && isset($merged[$key]) && is_array($merged[$key])) {
          $merged[$key] = $this->array_merge_recursive_distinct($merged[$key], $value);
        } else {
          // change from original code
          // do not overwrite value in first array if it exists
          if (!isset($merged[$key])) {
            $merged[$key] = $value;
      return $merged;

    Now we’re going to create an acf/save_post filter

    // low priority ensures it runs before anything else
    // make lower if needed
    add_filter('acf/save_post', 'acf_reorder_hidden_fields', -1);
    function acf_reorder_hidden_fields($post_id) {
      if (!isset($_POST['acf'])) {
        // no need to run
          You probably want to do some more checking here
          for example only running on certain post types
          or not running on options pages, etc, etc...
      // get existing field values for all fields of this $post_id
      // we need to do this by getting the field objects
      // and load unformulated values
      // because we need to have field keys
      $fields = get_field_objects($post_id, false);
      // set up array to hold old values
      $old_values = array();
      foreach ($fields as $field) {
        $old_values[$field['key']] = $field['value'];
      // now using the custom array maerg function
      $_POST['acf'] = acf_array_merge_recursive_distinct($_POST['acf'], $old_values);