<?php
$user = 'username';
$passowrd = 'password';
$conn = new PDO('mysql:host=ip;dbname=DBName;port=3306',$user,$passowrd);
?>

<?php
include 'DB.php';

class Manager {

    function jsonQuery() {

        $response = array ();


        $st = $conn->query ( "query");

        $response ["results"] = array ();

        foreach ( $st->fetchAll () as $row ) {

            //my stuff with the query
        }

        $response ["success"] = 1;

        echo json_encode ( $response );
    }

}

$object = new Manager();

$object->jsonQuery();

?>