如何在另一个会话中使用$ _SESSION ['variable']?

时间:2019-04-19 18:50:26

标签: php file variables session session-variables

我正在制作一个Web应用程序,用户可以在其中登录并访问个人资料并进行测验。我大多数情况下都起作用,唯一的问题是,它似乎“忘记”了哪个用户登录。这意味着我无法从用户登录会话时访问任何变量。 例如,当我尝试在不同的会话或页面中使用变量$_SESSION['username'] = $username;时,我有一个$username会返回不确定的变量。另外,我还没有终止登录会话。

现在,我正尝试将测验的结果与用户的用户名一起存储到数据库中,但它仅存储得分而不是用户名。

下面是我的代码。

authenticate.php文件(其中包含有关用户名的变量)

<?php
session_start();
// Change this to your connection info.
$DB_HOST = 'localhost';
$DB_USER = 'root';
$DB_PASS = '';
$DB_NAME = 'phplogin';
// Try and connect using the info above.
$con = mysqli_connect($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
if ( mysqli_connect_errno() ) {
    // If there is an error with the connection, stop the script and display the error.
    die ('Failed to connect to MySQL: ' . mysqli_connect_error());
}
// Now we check if the data was submitted, isset will check if the data exists.
if ( !isset($_POST['username'], $_POST['password']) ) {
    // Could not get the data that should have been sent.
    die ('Username and/or password does not exist!');
}
// Prepare our SQL
if ($stmt = $con->prepare('SELECT username, password FROM users WHERE username = ?')) {
    // Bind parameters (s = string, i = int, b = blob, etc), hash the password using the PHP password_hash function.
    $stmt->bind_param('s', $_POST['username']);
    $stmt->execute();
    $stmt->store_result();
    // Store the result so we can check if the st_account exists in the database.
    if ($stmt->num_rows > 0) {
        $stmt->bind_result($username, $password);
        $stmt->fetch();
        // st_account exists, now we verify the password.
        if (password_verify($_POST['password'], $password)) {
            // Verification success! User has loggedin!
            $_SESSION['loggedin'] = TRUE;
            $_SESSION['name'] = $_POST['username'];
            $_SESSION['username'] = $username;
            include_once 'homepage.php';

            // echo 'Welcome ' . $_SESSION['name'] . '!';
        } else {
            echo 'Incorrect username and/or password!';
        }
    } else {
        echo 'Incorrect username and/or password!';
    }
    $stmt->close();
} else {
    echo 'Could not prepare statement!';
}
?>

final.php文件

<php include "process.php"?>

第24-44行

    <main>
        <div class="container">
             <h2>You are Done!</h2>
             <p>Congrats! You have completed the test</p>
             <p>Final score: <?php echo $_SESSION['score']; ?></p>
           <?php echo $score; ?>
             <a href="question.php?n=1" class="start">Take Test Again</a>
           <?php
           $DB_HOST = 'localhost';
           $DB_USER = 'root';
           $DB_PASS = '';
           $DB_NAME = 'phplogin';
           $con = mysqli_connect($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
            $query = "INSERT INTO `results`(`username`,`score`) VALUES ($username, $score)";
            mysqli_query($con, $query);
            ?>



             <?php session_destroy(); ?>
        </div>

我不知道是否需要包含process.php,但我认为显示$ score变量的来源可能会有所帮助。

process.php文件(这不是整个文件。)

<?php include 'database.php'; ?>
<?php session_start(); ?>
<?php
    //Check to see if score is set_error_handler
    if (!isset($_SESSION['score'])){
        $_SESSION['score'] = 0;
    }
    $score = $_SESSION['score'];

}
?>

对不起,如果我犯了一个非常简单的愚蠢错误,不要恨我,我在编码方面仍然很糟糕。

2 个答案:

答案 0 :(得分:2)

session_start();放在代码的最顶部,例如,在final.php文件的最顶部,而不是process.php文件。

例如;

<?php
    session_start();
    include 'database.php'; 
?>

答案 1 :(得分:0)

您可以尝试的简单解决方案

session_start();

我们必须将其添加到php文件的顶部,否则php抛出诸如“已发送标头”或“无法启动会话”之类的异常。