Login login_PHP tutorial in php

login
require "../include/DBClass.php";
$username=$_POST['UserName'];
$password=$_POST['Password'] ;
if(empty($username) || empty($password)){
Go_Msg("Please fill in the username and password!","../default.html");
exit;
}
DBConn();
$password=md5($password);
$SQL = "Select UserName,UserType,UserPass From siteuser where UserName='" . $username ."' and UserPass='" . $password . "' and isopen=1";
//echo "$SQL";
$result = $db -> exec_SQL($SQL);
$total= mysql_num_rows($result);
if($total==0){
DBClose();
Go_Msg("The registered user has not passed the administrator review or the username and password do not match! Please re-enter! ","../default.html");
exit;
}else{
$Rs = $db -> fetch_array($result);
//Add value and log in
session_register("username");
session_register("usertype");
$_SESSION["usertype"]=$Rs['UserType'];
$_SESSION["username"]= $username;
//echo $_SESSION["username"];
if ($_SESSION["usertype"]==1){
Go_Msg("Login successful!","default.php" );

//header('Location:http://163.com');
}
if ($_SESSION["usertype"]==2){
Go_Msg ("Login successful! ","../user2/default_1.php");
}
if ($_SESSION["usertype"]==3){

Go_Msg("Login successful!"," ../user3/default_2.php");
}
// header('Location:default.php');
}
DBClose();

?> ;

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