gistfile1.php

  foreach ($item_variations as $item_variation) {
    $nid = $item_variation->nid;
    $form[$nid] = array(
      '#markup' => check_plain($item_variation->title);
    );
    foreach ($types as $type) {
      $form[$nid][$type] = array(
        '#markup' => check_plain($label);
      );

      foreach ($sizes as $size) {
        $form[$nid][$type][$size] = array(
          '#type' => 'textfield',
          '#element_validate' => 'integer',
          '#default_value',
        );
      }
    }
  }