<?php

session_start();

error_reporting(E_ERROR); 

$zh=$_POST['zh'];

$password=$_POST['password'];

$user=$_POST['user'];

if(!isset($user)) {

    echo "<script> alert('请选择用户类型');</script>";

    echo "<script> history.go(-1);<";/script>

}

$conn=mysqli_connect("localhost","8admin","8admin") atau mati('连接数据库失败');

$db=mysqli_select_db(");

,"8_select_db(");

="SELECT*FROM admin WHERE admin_id ='$zh' AND password='$password' ";

$sql2="select * from teacher where teach_id ='$zh' and password='$password' ";

$sql3="select * from student where stuno ='$zh' and password='$password' ";

mysqli_query($conn,"set names utf8");

switch($user){

    case 1 :$result=mysqli_query($conn,$sql)or die('查询不到'); 

               $row = mysqli_fetch_array($conn,$result);

               $count=$row[0];

         

              $url="index_admin.php";

$_SESSION['admin_name']=$row['name'];

                   $_SESSION['admin_id']=$row['admin_id'];

                                             "."location.href='".$url."'"."</script>";

               }

               lain {

        ;       skrip或密码错误'); </skrip>";

                    gema "<skrip> history.go(-1);</skrip>";

                }

   }

    kes 2:$result=mysqli_query($sql2, $conn);  

        $result=mysqli_query($sql2,$conn)or die('查询不到'); 

               $row = mysqli_fetch_array($result);

               $count=$row[0];

.                   $_SESSION['teacher_id']= $row['teach_id'];

                   echo "<script type='text/javascript'>"."location.href='".$url."'"."</script>";

.

                    gema "<skrip> history.go(-1);</ skrip>";

                }

                break;

    kes 3:$result=mysqli_query($sql3,$conn);  

        $result=mysqli_query($sql3,$conn)or die('查询不到'); .         $url="index_stu.php";

                   $_SESSION[ 'stu_name']=$row['name'];

                   $_SESSION['stu_id']=$row['stuno'];

                     javascript type='<script type='< location.href='".$url."'"."</script>";

               }

               lainnya {

           ;     cho或密码错误');</ skrip>";

                    gema "<skrip> history.go(-1);</skrip>";

                }

  

 

 

  lalai :break;

}  

mysqli_close($conn);

?>