Question

我创建了6个php文件teacher.php，student.php，login.php，logout.php，index.php和config.php

我做了一些编码，它显示了：

username:
password

我可以输入我在数据库中注册的帐户名和密码。

但输入我的帐户名和密码或密码错误或输入后。只需按Enter键

显示空白页面，不显示任何内容。

它有什么问题，我错过了一些编码或错误吗？

很抱歉，因为我是php新手，希望你能给我一些建议：）

我认为主要问题在于login.php，这些是代码：

<?php
include "config.php";
if(isset($_POST['log'])){   
    $user = $_POST['user'];
    $pass = md5($_POST['pass']);
    $hsl = mysql_query("select * from login where user='$user' and pass='$pass'");
    $data = mysql_fetch_array($hsl);
    $username = $data['user'];
    $password = $data['pass'];
    $type = $data['type'];
    $name = $data['name'];
    if($user==$username && $pass=$password){
            session_start();
            $_SESSION['name']=$name;
            if($type=='student'){
                echo "<script>location.assign('student.php')</script>";
            }else if($type=='teacher'){
                echo "<script>location.assign('teacher.php')</script>";
            } else{
                echo "<script>location.assign('wrong page.php')</script>";
            }
    }
}
?>

Answer 1

注意： -

mysql_ *在PHP 5.5.0中已弃用，在PHP 7.0.0中已被删除。相反，应使用MySQLi或PDO_MySQL扩展名。

试试这段代码： -

// add this line always first
session_start();
include "config.php";
if(isset($_POST['log'])){   
    $user = $_POST['user'];
    $pass = md5($_POST['pass']);
    $hsl = mysql_query("select user,type,name from login where user='$user' and pass='$pass'");

    if (!$hsl) {
        // Debug query result by below code
        //echo 'Could not run query: ' . mysql_error();
        //exit;
        echo '<script language="javascript">';
        echo 'alert("Username / Password Seems Wrong !")';
        echo '</script>';
    }else{
      $row = mysql_fetch_row($hsl);
      $username = $row[0];
      $type =  $row[1];
      $name =  $row[2];
      $_SESSION['name'] = $name;
         if($type=='student'){
                echo "<script>location.assign('student.php')</script>";
            }else if($type=='teacher'){
                echo "<script>location.assign('teacher.php')</script>";
            } else{
                echo "<script>location.assign('wrong page.php')</script>";
            }
    }

如果您想重定向到文件，请按以下方式更改您的条件： -

if($type=='student'){
                //echo "<script>location.assign('student.php')</script>";
                header("Location: student.php");
            }else if($type=='teacher'){
                //echo "<script>location.assign('teacher.php')</script>";
                header("Location: teacher.php");
            } else{
                //echo "<script>location.assign('wrong page.php')</script>";
                header("Location: wrong page.php");
            }
    }

希望它会对你有所帮助:)。

php登录系统显示空白页面

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