Description:
------------
---
From manual page: http://www.php.net/pdo.intransaction
---
It looks like that inTransaction() is not a PDO class static method.
It I use it as proposed

POD::inTransaction()

I get this error:

Fatal error: Uncaught Error: Non-static method PDO::inTransaction() cannot be called statically 

If I change it to 

        $db = new PDO(DB_DSN, DB_USER, DB_PASS, DB_OPT);
...
        if ($db->inTransaction())
        {
            $db->rollBack();
        }

it works.