Description:
------------
I'm able to connect and issue queries to DB2 with invalid credentials (but using the valid DB name) using ibm_db2.

$ db2level
DB21085I  Instance "db2inst1" uses "32" bits and DB2 code release "SQL08020"
with level identifier "03010106".
Informational tokens are "DB2 v8.1.0.64", "s040812", "MI00086", and FixPak "7".
Product is installed at "/opt/IBM/db2/V8.1".

ibm_db2 version 1.1.4

Reproduce code:
---------------
<?php

$db="SAMPLE"; // the DB is valid
$dsn = "DSN=$db;User Id=blah;Password=blahblah;";
$conn = db2_connect($dsn, "", "");
var_dump($conn);

db2_exec($conn, "SELECT 1 FROM SYSIBM.SYSDUMMY1"); 
var_dump(db2_fetch_array($r));

?>

Expected result:
----------------
I would expect db2_connect() to fail like it does when I use invalid DB name.

Actual result:
--------------
resource(5) of type (conn struct)
array(1) {
  [0]=>
  int(1)
}