Question

我似乎无法获得$ _SESSION项来往/从不同页面传送。我已验证PHP.ini文件中的“ use_only_cookies = 1”。最初加载站点时，第一页是“ index.php”。该页面加载主页，菜单等。当用户按下“ Login”菜单选项时，代码将启动“ login.php”文件，并且在该文件中，我设置了两个$ _SESSION字段，以指示登录成功另一个保留用户名。然后，使用header（）函数的代码将调用“ index.php”文件，其中的会话字段现在显然为NULL，并且无法正确评估。下面是这两个文件以及HTML头文件，如下所示。我也看过http://stackoverflow.com/questions/5849898/php-sessions-not-working。任何帮助，将不胜感激。谢谢。

文件：Index.php

      <?php
      session_start();
      $page_title='Welcome to this Site!';
      include('php/vmenus.php');
      include('html/header.html');

      ?>

    <!-- Image Slider -->
    <div id="slideshow">
        <div>
            <img src="images/test1.jpg" width="1000" height="600">  
        </div>
        <div>
            <img src="images/test2.jpg" width="1000" height="600">
        </div>
        <div>
            <img src="images/test3.jpg" width="1000" height="600">
        </div>
    </div>

    <!-- Content Area -->
    <div id="content">
        <div class="row">
            <div class="column2left">

            <h1>Content Header</h1>

            <p>
        Paragraph of text
            </p>
        </div>
        <div class="column2right"> 
        <p> The Right Side</p><br>
            <?php
                vmenustart();
                vmenuitem("#","Calendar");
                vmenuitem("#","Public Records");
                vmenuitem("#","Menu 3");
                vmenuitem("#","Menu 4");
                vmenuend();
            ?>
        </div>
    </div>

<?php
include('html/footer.html');
?>

文件：Login.php

<?php
$page_title="Login";

// if user is already logged in to the website, then redirect them to the home page
// and terminated this script
if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
header("location: index.php");
exit;
}

include('php/vmenus.php');
include('php/forms.php');

// open the master database code
require_once "php/dbconfig.php";

$username = "";
$password = "";
$username_err = "";
$password_err = "";

// Process FORM data when the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {

//Check if username is empty
if (empty(trim($_POST["username"]))) {
    $username_err = "Please enter a valid username.";
}
else {
    $username = trim($_POST["username"]);
}

// Check if password is empty
if(empty(trim($_POST["password"]))){
    $password_err = "Please enter your password.";
} else{
    $password = trim($_POST["password"]);
}

// Validate credentials
if (empty($username_err) && empty($password_err)){
    // Prepare a select statement
    $sql = "SELECT UserID, Passwrd FROM Users WHERE UserID = ?";

    if ($stmt = mysqli_prepare($link, $sql)){

        // Set parameters
            $param_username = $username;

        // Bind variables to the prepared statement as parameters
        mysqli_stmt_bind_param($stmt, "s", $param_username);

        // Attempt to execute the prepared statement
        if (mysqli_stmt_execute($stmt)){
            // Store result
            mysqli_stmt_store_result($stmt);

            // Check if username exists, if yes then verify password
            if (mysqli_stmt_num_rows($stmt) == 1){                    
                // Bind result variables
                mysqli_stmt_bind_result($stmt, $username, $hashed_password);
                if (mysqli_stmt_fetch($stmt)){
                    if (SHA1($password) == $hashed_password) {
                        // Password is correct
                        // Store data in session variables
                        $_SESSION["loggedin"] = true;
                        $_SESSION["username"] = $username;                            

                        // Redirect user to welcome page
                        header("location: index.php");
                    } 
                    else{
                        // Display an error message if password is not valid
                        $password_err = "The password you entered was not valid.";
                    }
                }
            } else{
                // Display an error message if username doesn't exist
                $username_err = "No account found with that username.";
            }
        } else{
            echo "Oops! Something went wrong. Please try again later.";
        }
    }

    // Close statement
    mysqli_stmt_close($stmt);
}

// Close connection
mysqli_close($link);
}       

include('html/header.html');

// start the page, check for errors
echo '<div class="page" style="font-family:arial">';
formStart("login.php","","wrapper");
formFieldSetStart("");
    echo '<h2 class="hdr-contactus">User Login</h2>';

    //check for errors, if errors then display them
    if (!empty($username_err) || !empty($password_err)) {
        echo '<h1>Error(s):</h1>';
        if (!empty($username_err)) {
            echo $username_err.'<br>';
        }
        if (!empty($password_err)) {
            echo $password_err.'<br>';
        }
    }

    formDivStart("fields");

        formParaStart("row");
        fieldAdd("text","username","User Name","Y","field-large","");
        formParaEnd();

        formParaStart("row");
        fieldAdd("password","password","Password","Y","field-large","");
        formParaEnd();

    formDivEnd();
formFieldSetEnd();

fieldAddSubmit("Login");

formEnd();
echo '</div>';

include('html/footer.html');

文件：Header.html

<!DOCTYPE html>
<html lang="en">
<head>
<title><?php echo $page_title; ?></title>
<link rel="stylesheet" href="css/style.css" type="text/css" />
<meta http-equiv="cache-control" content="no-cache, must-revalidate, post-check=0, pre-check=0" />
<meta http-equiv="cache-control" content="max-age=0" />
<meta http-equiv="expires" content="0" />
<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
<meta http-equiv="pragma" content="no-cache" /> 
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<script src="js/jquery-3.4.0.js"></script>
</head>
<body>
<div class="headerimg">
    <img src="images/test1.jpg" width="150" height="125">
</div>  
<div class="header">
    <h1>Title</h1>
    <h2>Sub-Title</h2>
</div>

<?php
    hmenustart();
    hmenuitem("#","Home");
    hmenudropstart("About");
        hmenudropitem("aboutus.php","About Us");
        hmenudropitem("#","Our History");
    hmenudropend();
    hmenudropstart("Board");
        hmenudropitem("#","Board Members");
        hmenudropitem("#","Committees");
        hmenudropitem("#","Documents");
        hmenudropitem("#","Message Baord");
    hmenudropend();
    hmenudropstart("Members");
        hmenudropitem("#","Calendar");
        hmenudropitem("#","FAQ");
        hmenudropitem("#","Member Directory");
        hmenudropitem("#","Member Documents");
        hmenudropitem("requestmgr.php","Member Requests");
        hmenudropitem("#","Questionaire");
    hmenudropend();
    hmenuitem("#","Photos");
    hmenuitem("contactus.php","Contact Us");

    if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {
        hmenuitemfloatright("logout.php","Logout");
    }
    else {
        hmenuitemfloatright("login.php","Login");
    }

    hmenuend();
?>

<!-- Start of Page specific content --!>

Answer 1

您忘记在每个.php文件中使用session_start()。

请注意，这应该是网页上的第一件事。在调用该函数之前输出HTML会导致错误。

PHP SESSION项目不能跨页面携带

1 个答案: