PHP登录不'；行不通
我有一个登录屏幕，但似乎有问题 单击“登录”时，出现以下错误： 出现错误\u太多\u重定向 我不知道是什么原因造成的，有人知道吗 login.php：PHP登录不'；行不通,php,session,Php,Session,我有一个登录屏幕，但似乎有问题 单击“登录”时，出现以下错误： 出现错误\u太多\u重定向 我不知道是什么原因造成的，有人知道吗 login.php： <?php include('db/login.php'); // Include Login Script if ((isset($_SESSION['email']) != '')) { header('Location: modal.php'); } ?> <!D
<?php
include('db/login.php'); // Include Login Script
if ((isset($_SESSION['email']) != ''))
{
header('Location: modal.php');
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Log In | DKTP</title>
<link rel="stylesheet" href="css/login.css" type="text/css">
</head>
<body>
<div class="wrap">
<div class="fleft">
</div>
<center>
<div id="login-form">
<form method="post">
<table align="left" width="32%">
<tbody>
<tr>
<td><img src="img/logo.png" align="center"></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td>Aanmelden met DTKP account</td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td><input type="text" name="email" placeholder="iemand@dktp.nl" required=""></td>
</tr>
<tr>
<td><input type="password" name="password" placeholder="*******" required=""></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td><input name="submit" type="submit" value=" Login "></td>
</tr>
<tr>
<div class="error"><?php echo $error;?></div>
</tr>
</tbody>
</table>
</form>
</div>
</center>
</div>
</body>
</html>
<?php
session_start();
include("db/dbconnect.php"); //Establishing connection with our database
$error = ""; //Variable for storing our errors.
if(isset($_POST["submit"]))
{
if(empty($_POST["email"]) || empty($_POST["password"]))
{
$error = "Both fields are required.";
}else
{
// Define $username and $password
$username=$_POST['email'];
$password=$_POST['password'];
// To protect from MySQL injection
$username = stripslashes($username);
$password = stripslashes($password);
$username = mysqli_real_escape_string($db, $username);
$password = mysqli_real_escape_string($db, $password);
$password = md5($password);
//Check username and password from database
$sql="SELECT * FROM users WHERE email='$username' and password='$password'";
$result=mysqli_query($db,$sql);
$row=mysqli_fetch_array($result,MYSQLI_ASSOC);
//If username and password exist in our database then create a session.
//Otherwise echo error.
if(mysqli_num_rows($result) == 1)
{
$_SESSION['username'] = $login_user; // Initializing Session
header("location: modal.php"); // Redirecting To Other Page
}else
{
$error = "Incorrect username or password.";
}
}
}
?>
登录| DKTP
Aanmelden符合DTKP账户
<?php
include('db/login.php'); // Include Login Script
if ((isset($_SESSION['email']) != ''))
{
header('Location: modal.php');
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Log In | DKTP</title>
<link rel="stylesheet" href="css/login.css" type="text/css">
</head>
<body>
<div class="wrap">
<div class="fleft">
</div>
<center>
<div id="login-form">
<form method="post">
<table align="left" width="32%">
<tbody>
<tr>
<td><img src="img/logo.png" align="center"></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td>Aanmelden met DTKP account</td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td><input type="text" name="email" placeholder="iemand@dktp.nl" required=""></td>
</tr>
<tr>
<td><input type="password" name="password" placeholder="*******" required=""></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td><input name="submit" type="submit" value=" Login "></td>
</tr>
<tr>
<div class="error"><?php echo $error;?></div>
</tr>
</tbody>
</table>
</form>
</div>
</center>
</div>
</body>
</html>
<?php
session_start();
include("db/dbconnect.php"); //Establishing connection with our database
$error = ""; //Variable for storing our errors.
if(isset($_POST["submit"]))
{
if(empty($_POST["email"]) || empty($_POST["password"]))
{
$error = "Both fields are required.";
}else
{
// Define $username and $password
$username=$_POST['email'];
$password=$_POST['password'];
// To protect from MySQL injection
$username = stripslashes($username);
$password = stripslashes($password);
$username = mysqli_real_escape_string($db, $username);
$password = mysqli_real_escape_string($db, $password);
$password = md5($password);
//Check username and password from database
$sql="SELECT * FROM users WHERE email='$username' and password='$password'";
$result=mysqli_query($db,$sql);
$row=mysqli_fetch_array($result,MYSQLI_ASSOC);
//If username and password exist in our database then create a session.
//Otherwise echo error.
if(mysqli_num_rows($result) == 1)
{
$_SESSION['username'] = $login_user; // Initializing Session
header("location: modal.php"); // Redirecting To Other Page
}else
{
$error = "Incorrect username or password.";
}
}
}
?>
<?php
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', 'Iamthebest1009');
define('DB_DATABASE', 'dktp');
$db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
?>
<?php
include("db/check.php");
?>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="css/modal.css" type="text/css" />
<link href='//fonts.googleapis.com/css?family=Philosopher' rel='stylesheet'>
</head>
<body>
<h1 class="hello">Hello, <em><?php echo $login_user;?>!</em></h1>
<br><br><br>
<a href="logout.php" style="font-size:18px">Logout?</a>
<!-- Trigger/Open The Modal -->
<button id="btn">Thema</button>
<!-- The Modal -->
<div id="myModal" class="modal">
<!-- Modal content -->
<div class="modal-content">
<div class="modal-header">
<span class="close">×</span>
<h2>Kies thema</h2>
</div>
<div class="modal-body">
<a href="tablenorm.php"><button id="btn2">Normen</button></a>
<a href="tableorden.php"><button id="btn2">Ordenen</button></a>
<a href="tableclust.php"><button id="btn2">Clusteren</button></a>
</div>
</div>
</div>
<script src="js/modal.js"></script>
</body>
</html>
你好
西玛
&时代；
基斯·西玛
<?php
include('db/dbconnect.php');
session_start();
$user_check=$_SESSION['email'];
$sql = mysqli_query($db,"SELECT email FROM users WHERE email='$user_check' ");
$row=mysqli_fetch_array($sql,MYSQLI_ASSOC);
$login_user=$row['email'];
if(!isset($user_check))
{
header("Location: modal.php");
}
?>
login.php中的：
改变
if ((isset($_SESSION['email']) != ''))
致：
关于“为什么”这应该解决问题：
在php手册中：
isset
：如果var存在且值不是NULL，则返回TRUE。否则为FALSE
代码太多。您需要自己更好地解决这个问题。我们不是调试器。您需要隔离问题并从中进行调试。如果你陷入困境，请清楚地解释什么东西不适合你。我建议你读一个好的问题和答案。另外，请务必阅读。如果（（isset（$\u SESSION['email']）！=”）
为假阳性。它需要分为两种不同的情况。一个用来检查它是否已设置，另一个用来检查它是否为空。您不应该使用md5来使用此代码，因为它不安全。你是在上网吗？可能是重定向循环？甚至可能是.htaccess
中某个地方的mod重写，谁知道呢。我认为OP已经越狱了。事实上，如果他们想检查这两种情况，应该将其设置为两种不同的条件。