Description:
------------
I use PDO with dblib (Freetds / Sybase) : when I try to execute a procedure that doesn't exists on the server (or something else that return an error) with PDO, I have not the correct error returned by errorInfo. However, with previous versions of PHP like 5.2.4 it's worked correctly.

Test script:
---------------
$pdo = new PDO("dblib:host=MY_SERVER", "MY_LOGIN", "MY_PWD");
$st = $pdo->prepare("EXEC A_UNKNOW_PROCEDURE");
$good = $st->execute();
if (!$good) {
    $error = $st->errorInfo();
    var_dump($error);
}

Expected result:
----------------
The error returned by the Sybase server like : Stored procedure 'A_UNKNOW_PROCEDURE' not found. Specify owner.objectname or use sp_help to check whether the object exists (sp_help may produce lots of output)

Actual result:
--------------
General SQL Server error: Check messages from the SQL Server [2812] (severity 16)