You can put a user.ini file in your FTP directory root (below the public_html directory) otherwise the configuration will default to the global php.ini on the web server. To avoid problems you should ensure that in your php.ini file you must set cgi.force_redirect=0 This is necessary for PHP to work inside IIS.
For Zend Optimizer and ioncube loader you will need to add the following lines:
Unfortunately, this feature is not available for the temporary URL.
** Once changes have been made you will need to contact support when you have uploaded your user.ini file in order for your hosting to be configured to pick this file up. **