private static function writeCSVRecords($file, $request_id, $records)
{
$f = new CFile($file);
$f->open('a');
foreach ($records as $fields) {
$f->write($request_id . self::csv_fields_delimiter);
$f->write(implode(self::csv_fields_delimiter, $fields));
$f->write(self::csv_lines_delimiter);
}
$f->close();
}