$str=htmlspecialchars($_GET["do"]);
$link = mysql_connect("localhost", "login", "password")
or die("Could not connect: " . mysql_error());
mysql_select_db('db_test', $link)
or die("Could not select DB: " . mysql_error());
$qr_result = mysql_query("select id_redirect from tb_url where shfr_url='".$str."'")
or die(mysql_error());
$data = mysql_fetch_array($qr_result);
header("HTTP/1.1 301 Moved Permanently");
header("Location: ".$data['id_redirect']);