php+sqlsrv เลือกฐานข้อมูล SQL Server 2008 R2 - Windows 7 64 Bit ใครพอทราบบอกทีครับ

<?php

$ip = "";
$user = "";
$pass = "";
$db = "";

$connectionInfo = array( "Database"=>$db, "UID"=>$user, "PWD"=>$pass);
$conn = sqlsrv_connect($ip, $connectionInfo);

if( $conn ) {
     echo "Connection established.<br />";
}else{
     echo "Connection could not be established.<br />";
     die( print_r( sqlsrv_errors(), true));
}
?>