Make PDO_SQL extension work on PHP (sql server) help

I can not make the PDO_SQL extension get into PHP in any way I'm running Wampserver with PHP Version 7.1.9 in php.ini the extensions look like this:

extension=php_pdo_sqlsrv_7_ts_x64.dll
extension=php_sqlsrv_7_ts_x64.dll

The files are in the directory of php extensions correctly but in phpinfo, does not enter sqlsrv in any way I ran this script below to test but false returns

<?php
var_dump(extension_loaded('pdo_sqlsrv'));
?>

I do not know what else to do for these extensions to work, I've tried everything on other machines Who can give me an aid? Thank you very much.

Joab