Error!: could not find driver PHP Mysql -

i having issue connection mysql server fails above message . have made sure

1. extension folder = ext enabled,
2. the extension=php_pdo_mysql.dll enabled
3. in extension directory dll present.

i must mention - have manually downloaded , configured php , apache2 , mysql. although can run phpinfo correctly , not sure if have enable else make db connections work

although if run test

if (!defined('pdo::attr_driver_name')) {  echo 'pdo unavailable'; }  else echo('pdo available'); 

i message pdo available. when researching error came across php code test pdo available? question wherein happened above code fragment.

any appreciated.

thanks