Question

登录后，我的代码不会将我重定向到下一页。

<?php
$con = mysqli_connect("localhost","myusername","mypassword","mydatabase");  

include ("connection.php");
session_start();

if(isset($_POST['login']))
{
    $username = $_POST['username'];
    $password = $_POST['password'];

    $check = "SELECT * FROM admin WHERE username='$username' and password='$password'";
    $queryString = mysqli_query($db, $check) or die('ERROR:' . mysqli_error($db)); 
    if (mysqli_num_rows($queryString) > 0)
    {
        $admin = mysqli_fetch_assoc($queryString);

        $_SESSION['username'] = $admin['username'];
        session_write_close();
        header("location: http://mywebsite.com/home.php");
        die();
    } 
    else   
    {
        echo '<div class="popup-position">
                <div id="popup-wrapper">
                    <h3>Invalid user name or password.</h3><br/><a href="login.php">OK</a>
                </div>
               </div>';
    }
}

mysqli_close($con);

这是登录后下一页的身份验证：

<?php
session_start();
if (!isset($_SESSION['username']))
{
    header("location: login.php");
    exit();
}

Answer 1

try this

/send user to index. if he is login/ 

<?php 

require_once("inc/ header.inc.php");

if(isset($_SESSION['id']))

{ header("Location: index.php"); 
exit(); } 

<div class="container">
    <div class="form-container">
        <p class="heading text-center">Login</p>
<form action=" <?php echo $_SERVER['PHP_SELF'] ?>" method="post">
<div class="form-group">
                <input type="text" name="username" placeholder="Enter your Username" class="form-control">
            </div>
            <div class="form-group">
                <input type="password" name="password" placeholder="Enter your Password" class="form-control">
            </div>
            <input type="submit" value="Login" class="btn btn-primary" name="login">
        </form>
        <?php
            //login script
            if(isset($_POST['login'])){
                $username = trim( htmlspecialchars ($_POST['username']));
                $password = trim( htmlspecialchars ($_POST['password']));

                //if username or password is empty
                if(empty($username) || empty($password)){
                    echo "<div class='alert alert-danger'>Fill in all the fields</div>";
                    exit();
                }

                //check username and password match the db record
                $q = mysqli_query($con,"SELECT id FROM `user` WHERE username='$username' AND password='$password'");
                if(mysqli_num_rows($q) != 1){
                    echo "<div class='alert alert-danger'>Invalid username or password</div>";
                    exit(); 
                }

                //fetch the if of the logged in user start the session
                $row = mysqli_fetch_assoc($q);
                //set the session with logged in user id
                $_SESSION['id'] = $row['id'];
                $_SESSION['username'] = $username;
                header("Location: index.php");
                exit();
            }
        ?>
    </div>
</div>

Answer 2

让我帮你登录。

<强>的login.php

<html>
<head>
    <title>Hospital Login</title>
    <link href="login.css" rel="stylesheet" type="text/css">
</head>

<body>
    <form name="form1" method="post" action="process_login.php">    
        <fieldset class="formDisplay">          
            <legend><strong>Member Login </strong></legend>
            <strong>Username</strong></br></br> <input name="myusername" type="text" id="myusername">
            </br></br>
            <strong>Password</strong></br></br><input name="mypassword" type="password" id="mypassword">
            </br></br>
            <input type="submit" name="Submit" value="Login">
            </br></br>
            <?php
            echo $message;
            ?>
        </fieldset>
    </form>
</body>
</html>

上面的代码实际上应该是你的登录脚本中的内容，忘记了fieldset的事情，我只是将它用于别的东西：）

现在我们想要一个纯PHP文件来处理登录我们系统的输入。

<强> process_login.php

<?php
 include('database_connection.php');
 $myusername = mysqli_real_escape_string($DBConn, $_POST['myusername']);
 $mypassword = mysqli_real_escape_string($DBConn, $_POST['mypassword']);
$query="SELECT * FROM $doctor_table WHERE username='$myusername' AND passwd='$mypassword'";
 $result=mysqli_query($DBConn, $query);
 if(!$result){
echo "<p>
                        There was an error with the query.<br />\n" .
                        "The error was " .
                        htmlspecialchars(mysqli_error($DBConn), ENT_QUOTES) . 
                        ".<br />\nThe query was '" .
                        htmlspecialchars($query, ENT_QUOTES ) . 
                        "'</P>\n";
}
else if (!mysqli_num_rows($result)){
$message = "<p>Failed to Log In. Please check your username/password</p>\n";
include 'login.php';
}
else{
   $count=mysqli_num_rows($result);

                // If result matched $myusername and $mypassword, table row    must be 1 row
                if($count==1){

                // Register $myusername, $mypassword and redirect to file "login_success.php"
                session_start();
                $_SESSION['myusername'] = $myusername;
                $_SESSION['mypassword'] = $mypassword;
                header("Location: login_success.php");
                }
}
?>

现在，当您的身份验证成功时，您应该显示主页面。

请注意，您必须“清理”用户的每个条目，以避免SQL注入（有助于阻止ppl窃取数据库中的数据）

这些完整的代码完美无缺，我建议您使用我提供的代码，并随意调整以供自己使用：）

登录后不会重定向到下一页

2 个答案: