require_once('./DualSessionLogger.php');
$db = new PDO('your_db_details_here');
$DualSessionLogger = new DualSessionLogger($db, 'dual_session_table_name(optional)');
session_set_save_handler($DualSessionLogger, true);
session_start();
$_SESSION["db_file_session_key"] = "db+file_value";
if (isset($_SESSION["db_file_session_key"])){
echo "<b>Value=> </b>" . $_SESSION["db_file_session_key"];
} else {
echo "Didnt work";
}