Login en php - Informix

[elchuri2002]

$user='usuario';
$psw='psw';
$sqltext="select cod_usuario, password from web_users where cod_usuario = '$user' and password ='$psw'";
$connid = ifx_connect("ist@infx6shm","oasisadm","itron");
$rid= ifx_query($sqltext, $connid);
$row = ifx_fetch_row ($rid, "NEXT");

if ($row!=0)
{
session_start();
session_register("autentificado");
}
else
{
echo("Login incorrecto");
}