基于登录模块的不同页面上的PHP多用户登录表单

Question

我正在尝试创建一个登录页面，该页面将根据用户的登录模块将用户发送到不同的index.php页面。例如，如果具有“Admin”角色的用户登录，他们将被发送到“admin.php”，如果具有“branch”角色的用户登录，他们将被发送到“branch.php”页。

<?php


  session_start(); // Starting Session

  $error=''; // Variable To Store Error Message

    if (isset($_POST['submit']))
   {
  if (empty($_POST['username']) || empty($_POST['password']))
  {
  $error = "Username or Password is invalid";

     }
       else
    {
   // Define $username and $password
      $usr=$_POST['username'];

     $pwd=$_POST['password'];

     // Establishing Connection with Server by passing server_name, user_id              and password as a parameter

      $con = mysql_connect("localhost", "root1", "oec@123") or die('Error Connecting to mysql server');

     // To protect MySQL injection for Security purpose

  $username = stripslashes($usr);

 $password = stripslashes($pwd);

 $username = mysql_real_escape_string($usr);

  $password = mysql_real_escape_string($pwd);

   // Selecting Database

   $db = mysql_select_db("rms", $con);

     // SQL query to fetch information of registerd users and finds user match.

    $query = mysql_query("select Sl_no, username, password from login where         password='$pwd' AND username='$usr'", $con) or die('Error querying database');
    $rows = mysql_num_rows($query);

       $dbusr=$rows['username'];

     $dbpwd=$rows['password'];

    $dbsl= $rows['Sl_no'];


    if ($rows > 0)

      {
   switch($dbsl)
    {
   case 1 : header("Location: admin.php");
             break;
   case 2 : header("Location:branchadmin.php");
             break;
   case 3 : header("Location:accountant.php");
              break;
   case 4 : header("Location:reporter.php");
             break;
   default : header("Location:index.php");
     }
      $_SESSION['login_user']=$usr; // Initializing Session
      //header("location: admin.php"); // Redirecting To Other Page
             }

                        else {
    $error = "Username or Password is invalid";
      }
       mysql_close($con); // Closing Connection
   }
      }
     ?>