PHP while loop array return

I try to implement something like:

$data = my_obj::get_rows();

$data is now a PDO Statement,

my_obj is my class ( i have one for every db table ), implements __set and __get magic

get_rows() is a static method that return a PDO Statement.

Now i want convert $data to an my_obj instance, so I can have access to class method, something like :

 while( $d = my_obj::inject( $data ) ){
         $d->my_method();
 }

Now, i try to write my ::inject static method:

     static function inject($pdo_statement) {

        $data = $pdo_statement->fetchAll(PDO::FETCH_ASSOC);

        //and now?

    }

Can anyone help to solve this method?