PHP example tutorial login login example code in PHP

The example in this article shares the specific implementation code of login in PHP for your reference. The specific content is as follows

<?php 
require "../include/DBClass.php"; 
$username=$_POST['UserName']; 
$password=$_POST['Password']; 
if(empty($username) || empty($password)){ 
 Go_Msg("请填写用户名，密码！","../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("注册用户还没有通过管理员审核或用户名及密码不符！请重新输入！","../default.html"); 
 exit; 
 }else{ 
 $Rs = $db -> fetch_array($result); 
 //附值，并登录 
 session_register("username"); 
 session_register("usertype"); 
 $_SESSION["usertype"]=$Rs['UserType']; 
 $_SESSION["username"]=$username; 
 //echo $_SESSION["username"]; 
 if ($_SESSION["usertype"]==1){ 
  Go_Msg("登陆成功！","default.php"); 

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

   Go_Msg("登陆成功！","../user3/default_2.php"); 
 } 
 // header('Location:default.php'); 
 } 
DBClose(); 
// 何问起 hovertree.com
?>

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