Drupal: Views bulk operation to move a file without affecting node update date

vbo-update

<?php

// Dont include the php tag in the VBO interface

if(!empty($entity->field_picture) && empty($entity->field_pictures_multiple)) {
  $entity->field_pictures_multiple['und'] = array($entity->field_picture['und'][0]);
  field_attach_update('node', $entity);
}