gistfile1.txt

  // Combine all merge_var values - these values are used to send multipul messages
  // with customizations to the Mandrill templace based on the merge_var values and
  // the matching *|TAGS|*
  $mandrill_params['message']['merge_vars'] = empty($content['merge_vars']) ? $mandrill_params['message']['merge_vars'] : array_merge($content['merge_vars'], $mandrill_params['message']['merge_vars']);
  $mandrill_params['message']['global_merge_vars'] = $global_merge_vars;
  $mandrill_params['message']['to'] = empty($content['to']) ? $mandrill_params['message']['to'] : array_merge($content['to'], $mandrill_params['message']['to']);