Question

我的会话在localhost上工作，但是每当我尝试在我的信息学类项目的Web服务器（000webhost）上使用它们时，似乎它们并没有在整个页面中“保存”。

当我在登录页面上执行print_r($_SESSION);时（按下登录按钮后），该数组将返回我预先输入的完整值。我还试图查看与数据库的连接是否存在问题，但是当我尝试从表中检索值时，它就可以正常工作。

当我尝试在“ home.php”上print_r($_SESSION);时，数组为空。

<?php
   if($_POST) {

   $connection = new PDO('mysql:host=localhost;dbname=noah', 'noah','password'); //changed the connection details because it's not usefull here

   if(empty($_POST['username']) OR empty($_POST['password'])) {
       ?>

       <div class="alert error">
     <p>Please fill in all the fields</p>
       </div>

      <script>
         $(".alert").fadeIn("500");
      </script>

      <?php

   } else {
       $username = $_POST['username'];
       $password = $_POST['password'];
       $password = hash('sha512', $password);

       $verifyExistingUser = $connection->query("SELECT name FROM user WHERE username = '$username' AND password = '$password'");

       foreach ($verifyExistingUser as $key => $value) {
           retrievedUser = $value['name'];
       }


       if (empty($retrievedUser)) {

       ?>

       <div class="alert error">
          <p>Incorrect username / password</p>
       </div>
       <script>
          $(".alert").fadeIn("500");
       </script>

       <?php

       } else {
           try {
             session_start();
             $_SESSION["username"] = $username;
             $_SESSION["name"] = $retrievedUser;
             $_SESSION["password"] = $password;

             print_r($_SESSION);
             echo "retrieved name from database: " . $retrievedUser;
         echo "<script type='text/javascript'>window.location.href = 'home.php';</script>";

           } catch(PDOException $e) {
              echo "error: " . $e->getMessage();
       }
     }
   }
}
?>

编辑1
经过更正的完整代码（输出为Cannot modify header information - headers already sent by (output started at /storage/ssd2/777/7604777/public_html/process/loginProcess.php:2) in /storage/ssd2/777/7604777/public_html/process/loginProcess.php on line 70）。
我知道这是PHP中的HTML代码引起的，但是我想在其中包含一些jQuery和CSS，我该如何解决？

<?php session_start(); ?>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <link rel="stylesheet" type="text/css" href="assets/css/php.css">
    </head>
    <body>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js"></script>
            <?php
            error_reporting(E_ALL);
            ini_set("display_errors", 1);

                if($_POST) {

                    $connection = new PDO('mysql:host=localhost;dbname=noah', 'noah','password');

                    if(empty($_POST['username']) OR empty($_POST['password'])) {

                        ?>

                            <div class="alert error">
                                <p>Please fill in all the fields</p>
                            </div>

                            <script>
                                $(".alert").fadeIn("500");
                            </script>

                        <?php

                    } else {

                        $username = $_POST['username'];
                        $password = $_POST['password'];
                        $password = hash('sha512', $password);

                        $verifyExistingUser = $connection->query("SELECT name FROM user WHERE username = '$username' AND password = '$password'");


                        foreach ($verifyExistingUser as $key => $value) {

                                $retrievedUser = $value['name'];

                        }

                        if (empty($retrievedUser)) {

                            ?>

                                <div class="alert error">
                                    <p>Incorrect username / password</p>
                                </div>

                                <script>
                                    $(".alert").fadeIn("500");
                                </script>

                            <?php

                        } else {

                            try {

                                $_SESSION["username"] = $username;
                                $_SESSION["name"] = $retrievedUser;
                                $_SESSION["password"] = $password;
                                print_r($_SESSION); //debugging
                                echo "retrieved name from database: " . $retrievedUser; //debugging
                                header('location: ' . 'home.php');

                            } catch(PDOException $e) {

                                echo "error: " . $e->getMessage();

                            }

                        }

                    }

                }

            ?>
    </body>
</html>

Answer 1

建议1 请在您的php页面顶部使用session_start（）。

建议2 重定向到另一个页面，有一种简单的方法，

header('location: ' . 'http://site.url.you.want');

会话变量在localhost上有效，但在Web服务器上无效

1 个答案: