Yii2 Oracle PDO

I have the following in my php.ini file

extension=php_oci8_11g.dll

extension=php_pdo_oci.dll

When I run phpinfo() I get the following back:

enter image description here

Does PDO_OCI being blank mean i'm missing something - if so what?

Whilst going through Yii docs (http://www.yiiframework.com/doc-2.0/yii-db-connection.html) it says

Connection represents a connection to a database via PDO.

My queries have worked fine until, I've tried to use bindParam(). In which now I get Class 'app\models\PDO' not found as an error?

I have just ran if(class_exists("PDO")) and it returned true.

I spent some time on gitter and looking into it. It does seem that I need to namespace PDO to run these queries as Ryan mentioned

So declare in the model.

use PDO;