PHP access to Oracle Server

# server - port - instance
$conn = oci_connect('huypv', 'super*secret', '//192.168.1.113:1521/bidv');
if (!$conn) {
  $e = oci_error();
  trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$stid = oci_parse($conn, 'SELECT SYSDATE from dual');
oci_execute($stid);
oci_fetch_all($stid, $res);
var_dump($res);

oci_close($conn);