/**
 * Implements callback for user report batch process.
 */
function ls_draw_batch_process_user_report() {
  // Code for CSV file download ends.
  $destination = url('admin/reports/draws');
  $id = @$_GET['from_session'];
  $num_operations = 1000;
  $row_numbers = count($_SESSION['users_segment'][$id]);
  $operations = $row_numbers / $num_operations;
  $operations = floor($operations);
  $batch_operations = [];
  $filename = "summary_report_data_" . $id . "_" . time() . ".csv";
  for ($i = 0; $i <= $operations; $i++) {
    $min = 1 + $num_operations * $i;
    $batch_operations[] = [
      'ls_draw_write_data_on_csv_and_download_user_report',
      [
        'operation_type' => $id,
        'min' => $min,
        'filename' => $filename,
      ],
      [
        t('(Operation @operation)', ['@operation' => $i + 1]),
      ],
    ];
  }