pdo and firebird connection

Hi, I´ve trying now for hours just to connect with PDO to my firebird DB. I tried it first with a mysql db and had no problems at all. but it doesn´t work with firebird and I don´t know why (haven´t found anything helpful via google as well). I tried to use the manual from here: http://de3.php.net/manual/de/function.pdo-construct.php with the code below, I get always the error message: Fatal error: Call to a member function getAttribute() on a non-object in K:\_workspace\test1\pdo3.php on line 7 a test with the interbase driver works well (see in the code comments). => is the code correct? => where is the error!? => does the PDO firebird driver work? thx a lot for help, Michael <?php $username = 'SYSDBA'; $password = 'xxxxxx'; $dbh = new PDO( 'firebird:User=SYSDBA;Password=xxxxxx;Database=k:\_firebird\examples\EMPLOYEE.FDB;DataSource=localhost;Port=3050', $username, $password ); //$dbh = new PDO( 'firebird:User=SYSDBA;Password=xxxxxx;Database=k:\_firebird\examples\EMPLOYEE.FDB;DataSource=localhost;Port=3050' ); print $dbh->getAttribute(PDO_ATTR_AUTOCOMMIT); // <==Fatal error here! $stmt = $dbh->prepare("Select * from SHOW_LANGS('SRep',4,'Italy')"); $stmt->execute(); $stmt = null; /* // test with ibase driver $dsn = 'localhost:k:\_firebird\examples\employee.fdb'; $dbh = ibase_connect ( $dsn, $username, $password ) or die ("error in db connect"); $stmt="Select * from SHOW_LANGS('SRep',4,'Italy')"; $query = ibase_prepare($stmt); $rs=ibase_execute($query); $row = ibase_fetch_row($rs); echo $row[0]; // free result ibase_free_query($query); //ibase_free_result($rs); // close db ibase_close($dbh); */ ?>