Windows DLLs and Oracle

Hi,

From the site
http://download.swwwing.com/php4/modules/

I know these are unsupported dll's but....
Has anyone gotten the oracle dll's to work?

I have the following in my php.ini file.

extension_dir=d:\documents\httpd\php\php4\				extension=php_oci8.dll

But I keep getting the error
Fatal error: Call to undefined function: ociplogon() in include/db_oci8.inc on line 35

Which I assume means that the dll didn't load.

Any Ideas?