Description:
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Getting error accessing the oracle rowid in a PDO select statement.

The NLS_LANG is set to AMERICAN_AMERICA.AL32UTF8 same as the database.
I also restartet the Apache2.2 with the php as module, to be sure it take the right parameters.

Reproduce code:
---------------
$db_username = "elements";
$db_password = "elements";
$db = "oci:dbname=XE;charset=AL32UTF8";
$conn = new PDO($db,$db_username,$db_password);

$stmt = $conn->prepare("SELECT rowid,t1,t2 FROM test");
$stmt->execute();
  while ($row = $stmt->fetch()) {
    print_r($row);
  }

Expected result:
----------------
Array ( [ROWID] => AAADVUAAEAAAAFMAAA [0] => AAADVUAAEAAAAFMAAA [T1] => test1 [1] => test1 [T2] => First test [2] => First test )

Actual result:
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Warning: PDOStatement::fetch() [function.PDOStatement-fetch]: column 0 data was too large for buffer and was truncated to fit it