Some more information to this:

If you still have the client and server on the same machine, and you are getting "Access denied" from your PHP code but not from the console app, it could be because the PHP code runs with different users credentials than the console app (which you probably run from you user's interactive session). If your PHP code is running inside a Web server such as IIS, it probably is running under a dedicated account (such as IUSR_xxxx or IWAM_xxxx) with limited privileges.

In order to verify this, try to configure the Web server to use e.g. your own user account instead. If that helps, you will know that the problem is related to the account security settings.

Regards