/**
  * Pre-flight checks for a specific part of a batch.
  *
  * @param Batch $batch
  * @param string $type
  */
 private function verify_by_type(Batch $batch, $type)
 {
     // The data we want to verify.
     $batch_chunk = array();
     // Get data we want to verify.
     switch ($type) {
         case 'attachments':
             $batch_chunk = $batch->get_attachments();
             break;
         case 'users':
             $batch_chunk = $batch->get_users();
             break;
         case 'posts':
             $batch_chunk = $batch->get_posts();
             break;
     }
     // Verify selected part of batch.
     foreach ($batch_chunk as $item) {
         do_action('sme_verify_' . $type, $item, $batch);
     }
 }
 /**
  * Take content of a batch (attachments, users, post, custom data) and
  * inserted into database.
  *
  * @param Batch $batch
  */
 private function update_batch_content(Batch $batch)
 {
     $content = array('attachments' => $batch->get_attachments(), 'users' => $batch->get_users(), 'posts' => $batch->get_posts(), 'custom_data' => $batch->get_custom_data(), 'post_rel_keys' => $batch->get_post_rel_keys());
     $content = base64_encode(serialize($content));
     update_post_meta($batch->get_id(), '_sme_batch_content', $content);
 }