Making changes to the php.ini file settings will not be seen until the IIS (Internet Information Services) reloads or re-caches the settings. To check the current php.ini file settings, create a page that displays the PHP info.
Create a file named phpinfo.php, place the phpinfo(); on a page, this will show all the current PHP settings. Open your IIS 6 manager, expand the Application Pools folder, right click on DefaultAppPool and press Recycle. It only takes a second.
Then reload the sample PHP info page (phpinfo.php). The new setting will be listed.