sqlsrv扩展名未显示在phpinfo中。

Question

I'm using Win server 2k12, php 5.5.12, on wamp. Edited php.ini (both on apache dir and php dir) to add php_sqlsrv_55_ts.dll and the php_pdo_sqlsrv_55_ts.dll, and configured the extension dir path correctly. Happily, wamp is showing up those extentions at the PHP extension menu, and after ticking it and restarting all services, phpinfo is not showing up these changes! Not in the registered PHP streans entry, no anywhere. Do you have any idea why?

Thanks in advance.