使用 password_verify() 登录系统

Question

I'm trying to make a login system with hashed passwords.我正在尝试使用散列密码制作登录系统。 What is supposed to happen is after I click on the submit button a session should be created and I should be redirected to home.php.应该发生的事情是在我点击提交按钮后，应该创建一个会话，我应该被重定向到 home.php。 If input data doesn't match the data inside the database I should get "Error 1" or "Error 2" alerts.如果输入数据与数据库内的数据不匹配，我应该收到“错误 1”或“错误 2”警报。

My problem is that when I click on a submit button all that happens is that I get redirected to login.php.我的问题是，当我点击提交按钮时，所有发生的事情就是我被重定向到 login.php。 I get no errors and no alerts, only blank screen with login.php URL.我没有收到错误和警报，只有带有 login.php URL 的空白屏幕。

I'm trying to figure how to make the password_verify() part work.我想弄清楚如何使 password_verify() 部分工作。 Any kind of help is appreciated.任何形式的帮助表示赞赏。

Picture of database: https://imgur.com/a/BXiHBN4数据库图片： https : //imgur.com/a/BXiHBN4
Picture of what happens after a login attempt: https://imgur.com/a/qKZ1tsi登录尝试后发生的情况的图片： https : //imgur.com/a/qKZ1tsi

Form code:表格代码：

<html>

<head>

<title> Login now! </title>

<meta charset="UTF-8">

<link rel="stylesheet" type="text/css" href="css/style.css"/>

</head>

<body>

<header>

  <div class="alignRight">
    <a href="registration.html"> Register </a> &nbsp; &nbsp;
  </div>

  <div class="alignLeft">
    <a href="contact.html"> Contact us </a> &nbsp; &nbsp; 
    <a href="aboutus.html"> About us </a> &nbsp; &nbsp;
    <a href="news.html"> News </a>
  </div>

</header>

<h1> Welcome back! </h1>

<h2> Log in to continue with your work. </h2> 

<form name="login-form" id="login-form" action="login.php" method="post">

    <input class="_40" type="text" name="username"  pattern="[a-zA-Z0-9_]{1,15}" 
placeholder="Username"  required /> 

    <br />

    <input class="_40" type="password" name="pwd"  placeholder="Password"  required />

    <br />

    <input id="loginSubmitButton" type="submit" value="Submit"  /> 

</form>

</body>

</html>

PHP code: PHP代码：

<?php


session_start();

$servername ="localhost";
$username = "root";
$password = "";

$link = mysqli_connect($servername, $username, $password);

mysqli_select_db($link, "users");


$username = mysqli_real_escape_string($link, $_POST["username"]);
$pwd = mysqli_real_escape_string($link, $_POST["pwd"]); 
$query = "SELECT * FROM users WHERE Username = '$username'";
$result = mysqli_query($link, $query);
$row = mysqli_fetch_assoc($result);

if(($result->num_rows > 0))
{
    while($row = mysqli_fetch_array($result))
    {
        if(password_verify($pwd, $row["Hash"]))
        {
            $_SESSION["username"] = $username;
            header("location:home.php");
        }
        else
        {
            echo '<script>alert("Error 1")</script>';
        }
    }
}
else
{
    echo '<script>alert("Error2")</script>';
}


?>

Answer 1

I think I see the problem.我想我看到了问题。

It looks like you're probably fetching the only row from the results before the if看起来您可能在 if 之前从结果中获取唯一的行

$row = mysqli_fetch_assoc($result);

Then when you fetch again here, there's nothing left to fetch.然后当你再次在这里取货时，就没有什么可取的了。

if(($result->num_rows > 0))
{
    while($row = mysqli_fetch_array($result))

(I'm assuming the query will only return one row since username is unique.) （我假设查询只会返回一行，因为用户名是唯一的。）

使用 password_verify() 登录系统

问题描述

1 个解决方案

解决方案1
2 已采纳 2020-02-18 22:03:01

使用 password_verify() 登录系统

问题描述

1 个解决方案

解决方案1 2 已采纳 2020-02-18 22:03:01

解决方案1
2 已采纳 2020-02-18 22:03:01