Description:
------------
Hi,

if I try to connect to Oracle DB I get this error since PHP 5.2.4, with 5.2.0 or 5.2.1 work well

Regards,
Thomas

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

 /**
 * php.ini  (v5.2.4)
 *
 * ; Windows Extensions
 * extension=php_pdo.dll
 * extension=php_pdo_oci.dll
 * 
 */
 define('DBUSER','user');
 define('DBPASS','password');
 define('DBNAME','database');  

 try {
 
  // Connect to Oracle Windows v9.2 or v10
  $dbh = new PDO('oci:dbname='.DBNAME.';charset=ISO-8859-1',DBUSER,DBPASS);  
  echo 'Connect ok';
  
  $dbh = null;
  
 } catch (PDOException $e) {
 
  // Connect failed: SQLSTATE[HY000]: OCINlsCharSetNameToId: unknown character set name (ext\pdo_oci\oci_driver.c:488)
  echo 'Connect failed: ';  
  echo $e->getMessage();
  die();
 }

?>

Expected result:
----------------
Connect ok


Actual result:
--------------
Connect failed: SQLSTATE[HY000]: OCINlsCharSetNameToId: unknown character set name (ext\pdo_oci\oci_driver.c:488)