将mysql / php代码传输到PDO - 取代了mysql_close（$ con）

Question

I am doing a long poll and so I want to shut off my connection to the database on every loop (about 1 minute loops).

I used to use mysql_close($con), so what do I use in PDO?

Also, when I was using mysql_query it seemed to return numbers as string, so when I returned them to my calling js via json it was still a string. But now, the PDO seems to actually return it as a number. Is this right?

Answer 1

    $db = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
     // use the connection here
     ...........

     // and now we're done; close it
      unset($db);