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javascript - 未定义的索引：_SESSIONS 中的 userId

问题描述

我有一个用户可以登录和注册的网站。我可以同时执行这两项操作，甚至可以验证登录用户密码，但是在用户登录后我无法向网站添加注销按钮。

以下代码在 index.php 文件中有错误：

 $user = $_SESSION['userId'] ;

它在那一行中说Undefined index: userId in。如果我能让它工作，我将能够有一个注销按钮，这样用户就可以登录/注销。我在这里做错了什么，所以它无法获取userId详细信息，而是未定义？我看过类似的问题，但没有任何帮助。任何帮助表示赞赏。

在我的 login.php 中，我定义了$_SESSION['userId']

 if(password_verify($password, $hashed_password)) {
                    $_SESSION['email'] = $email;
                    $_SESSION['name'] = $row['username'];
                    $_SESSION['userId'] = $row['id'];

我在下面发布了我的其余代码。

索引.php

<?php
session_start();
error_reporting(E_ALL);
ini_set('display_errors', '1');
require "navigationbar.php";
?>

<html>
<head>
<link href="https://fonts.googleapis.com/css2?family=Dancing+Script&display=swap" rel="stylesheet">
    <link
      rel="stylesheet"
      href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
    />
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
    <script src="https://use.fontawesome.com/releases/v5.0.8/js/all.js"></script>
    <link href="stylee.css" rel="stylesheet" />
    <link href="https://fonts.googleapis.com/css2?family=Raleway:wght@100&display=swap" rel="stylesheet">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>


</head>
<body>
<?php

    $user = $_SESSION['name'] ; //it says undefined index name
if (isset($user )) {
    echo '<p>You are logged in</p>';
echo '<form action="logout.php" method="post">
<button type="submit" name="logout-submit">Logout</button>
</form>';              
    
    <link href="stylee.css" rel="stylesheet" />
    <form action="logoutbackend.php" method="post">
    <button type="submit" name="logout-submit" class="logout_button">Logout</button>
    </form>';
} else {
    echo '<p class="login-status">You are logged out!</p>';
    echo '<div class="login-container">
    <form action="./backend/loginbackend.php"  method="post">
    
    <div class="form-group row">
    <div class="col-sm-10">
        <h2>website</h2>
    </div>
    
    </div>
    
        <div class="form-group row">
            <div class="col-sm-10">
                <input type="username" class="form-control" name="username" placeholder="username">
            </div>
        </div>
    
        <div class="form-group row">
            <div class="col-sm-10" >
                <input type="password" class="form-control" name="password" placeholder="password">
            </div>
        </div>
    
    <div class="form-group row">
        <div class="col-sm-10">
            <button type="submit" class="btn btn-primary" name="login_submit">Log In</button>
        </div>
    </div>
    </form>
    <div class="form-group row">
        <div class="col-sm-10">
            
            <p>New to <span>ShowCo</span>?<a class="open-button" onclick="openForm()">Sign up</a> </p>
        </div>
    </div>
    
    <div class="form-popup" id="myForm">
        <form action="./backend/signupbackend.php" class="form-container" method="post">
        <div class="form-group row">
            <div class="col-sm-10" >
            <h1>Sign up</h1>
        </div>
    </div>
     
        <div class="form-group row">
            <div class="col-sm-10" >
                <input type="text" class="form-control" placeholder="Username" name="username" required>
           </div>
        </div>
    
       
    
         <div class="form-group row">
            <div class="col-sm-10" >
                <input type="email"class="form-control" placeholder="Email address" name="mail" required>
            </div>
        </div>
        <div class="form-group row">
            <div class="col-sm-10" >
                <input type="password" class="form-control" placeholder="Password" name="password" required>
            </div>
      </div>
    
         <div class="form-group row">
            <div class="col-sm-10" >
                <input type="password" class="form-control" placeholder="Repeat password" name="repeatpassword" required>
            </div>
        </div>  
        <div class="form-group row">
            <div class="col-sm-10" >
                <button type="submit" class="btn btn-primary" name="signup_submit">Sign up</button>
             </div>
        </div>
    
        
                <button type="button" class="close" aria-label="Close" onclick="closeForm()"><span aria-hidden="true">&times;</span></button>
           
        </form>
    </div>
    
    
    
    
    </div>
    
    <script>
    function openForm() {
        document.getElementById("myForm").style.display = "block";
    }
    function closeForm() {
        document.getElementById("myForm").style.display = "none";
    }
    
    </script>
    
';
}
?>

</body>


</html>


<?php
require "footer.php";
?>

注册后端.php

<?php 
if(isset($_POST["signup_submit"])) {
   
    require "../database_files/database_for_signup.php";
    require "../index.php";

    $username = $_POST['username'];
    $email = $_POST['mail'];
    $password = $_POST['password'];
    $repeatPassword = $_POST['repeatpassword'];

    if (empty($username) || empty($email) || empty($password) || empty($repeatPassword)) {
        header("Location: ../index.php?error=emptyfields&username=" .$username."&mail=" .$email);
        exit();
    } else if(!filter_var($email, FILTER_VALIDATE_EMAIL) && !preg_match("/^[a-zA-Z0-9]*$/",$username)) {
        header("Location: ../index.php?error=invalidmailusername");
       exit();
    } else if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        header("Location: ../index.php?error=invalidmail&username=".$username);
        exit();
    } else if (!preg_match("/^[a-zA-Z0-9]*$/",$username)) {
        header("Location: ../index.php?error=invalidusername&mail=".$email);
        exit();
    } else if($password != $repeatPassword) {
        header("Location: ../index.php?error=passwordcheck&username=".$username."&mail=".$email);
        exit();
    } else {


        $sql = "SELECT COUNT(username) AS num FROM signup_info WHERE username = :username";
        $stmt = $conn->prepare($sql);

        $stmt->bindValue(':username', $username);
        $stmt->execute();
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        if ($row['num'] > 0) {
            die('Sorry, username already exists. Please try a different username');
        }

        $passwordHash = password_hash($password, PASSWORD_BCRYPT, array("cost" => 12));
        
        $sql = "INSERT INTO signup_info(username, email, password) VALUES (:username, :email, :password)";
        $stmt = $conn->prepare($sql);

        $stmt->bindValue(':username', $username);
        $stmt->bindValue(':email', $email);
        $stmt->bindValue(':password', $passwordHash);

        $result = $stmt->execute();

        if($result) {
            echo "Registered!";
        }

       
           
    }
}
           


?>

登录后端.php

<?php
session_start();
if(isset($_POST['login_submit'])) {

    require "../database_files/database_for_signup.php";
   $username = $_POST['username'];
   $password = $_POST['password'];

   if ((empty($username)) || (empty($password))) {
       echo 'empty username/password';
       die();
   } 
  
$sql = 'SELECT username, email, password FROM signup_info WHERE username = :username';

if ($stmt = $conn->prepare($sql)) {
    $stmt->bindParam(':username', $username, PDO::PARAM_STR);
    if ($stmt->execute()) {
        if($stmt->rowCount() == 1) {
            if ($row = $stmt->fetch()) {
                $hashed_password = $row['password'];
                if(password_verify($password, $hashed_password)) {
                    $_SESSION['email'] = $email;
                    $_SESSION['name'] = $row['username'];
                    $_SESSION['userId'] = $row['id'];
                    echo "verfiied";
                } else {
                    echo "wrong password";                }
            }
        }
    }
}

  
   
}

?>

注销.php

<?php 

session_start();
unset($_SESSION['username']);
session_unset();
session_destroy();
header("Location: ./index.php");

标签： javascriptphpsqlauthentication

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