Login.php重定向到主页，而不是标题位置

我试图做一个公告板，只有管理员可以登录和张贴更新（学校），我是非常新的php。我的代码在mac上的MAMP服务器上运行良好，但当我将其上载到000webhost.com进行测试时，它在登录后不会重定向到正确的页面，而是重定向到index.php页面

这是我的密码。我没有在conf.php文件中启动会话

<?php

// Check if the user is already logged in, if yes then redirect him to welcome page
if (isset($_SESSION['loggedin']) && $_SESSION['loggedin'] === true) {
   header('location: logout.php');
   exit;
}

//check if not authorized

// Include config file
require_once '../conf.php';

// Define variables and initialize with empty values
$email = $password =  '';
$email_err = $password_err =  '';

// Processing form data when form is submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {

   // Check if email is empty
   if (empty(trim($_POST['email']))) {
      $email_err = 'Please enter email.';
   } else {
      $email = trim($_POST['email']);
   }

   // 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($email_err) && empty($password_err)) {
      // Prepare a select statement
      $sql = 'SELECT id, email, password FROM users WHERE email = ?';


      if ($stmt = mysqli_prepare($link, $sql)) {
         // Bind variables to the prepared statement as parameters
         mysqli_stmt_bind_param($stmt, 's', $param_email);

         // Set parameters
         $param_email = $email;

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

            // Check if email exists, if yes then verify password
            if (mysqli_stmt_num_rows($stmt) == 1) {
               // Bind result variables
               mysqli_stmt_bind_result($stmt, $id, $email, $hashed_password);
               if (mysqli_stmt_fetch($stmt)) {
                  //if ( password_verify( $password, $hashed_password ) ) {
                  if (($password == $hashed_password)) {
                     // Password is correct, so start a new session
                     //session_start();

                     // Store data in session variables
                     $_SESSION['loggedin'] = true;
                     $_SESSION['id'] = $id;
                     $_SESSION['email'] = $email;

                     // Redirect user to welcome page
                     header('Location: add_notice.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 email doesn't exist
               $email_err = 'No account found with that email.';
            }
         } else {
            echo 'Oops! Something went wrong. Please try again later.';
         }

         // Close statement
         mysqli_stmt_close($stmt);
      }
   }

   // Close connection
   mysqli_close($link);
}
?>

---

只想结束这个问题

如果在conf.php文件中调用
session\u start（）
，则需要在调用
$\u session[]
变量之前包含它

现在，在使用
SESSION\u start（）
初始化
$\u会话之前，您正在检查
$\u会话['loggedin']

移动require_once'../conf.php'；在该if语句之上，它将起作用，例如

<?php
// Include config file
require_once '../conf.php';

// Check if the user is already logged in, if yes then redirect him to welcome page
if (isset($_SESSION['loggedin']) && $_SESSION['loggedin'] === true) {
   header('location: logout.php');
   exit;
}

//check if not authorized

// Define variables and initialize with empty values
$email = $password =  '';
$email_err = $password_err =  '';

// Processing form data when form is submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {

   // Check if email is empty
   if (empty(trim($_POST['email']))) {
      $email_err = 'Please enter email.';
   } else {
      $email = trim($_POST['email']);
   }

   // 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($email_err) && empty($password_err)) {
      // Prepare a select statement
      $sql = 'SELECT id, email, password FROM users WHERE email = ?';


      if ($stmt = mysqli_prepare($link, $sql)) {
         // Bind variables to the prepared statement as parameters
         mysqli_stmt_bind_param($stmt, 's', $param_email);

         // Set parameters
         $param_email = $email;

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

            // Check if email exists, if yes then verify password
            if (mysqli_stmt_num_rows($stmt) == 1) {
               // Bind result variables
               mysqli_stmt_bind_result($stmt, $id, $email, $hashed_password);
               if (mysqli_stmt_fetch($stmt)) {
                  //if ( password_verify( $password, $hashed_password ) ) {
                  if (($password == $hashed_password)) {
                     // Password is correct, so start a new session
                     //session_start();

                     // Store data in session variables
                     $_SESSION['loggedin'] = true;
                     $_SESSION['id'] = $id;
                     $_SESSION['email'] = $email;

                     // Redirect user to welcome page
                     header('Location: add_notice.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 email doesn't exist
               $email_err = 'No account found with that email.';
            }
         } else {
            echo 'Oops! Something went wrong. Please try again later.';
         }

         // Close statement
         mysqli_stmt_close($stmt);
      }
   }

   // Close connection
   mysqli_close($link);
}
?>

是
logout.php
您的欢迎屏幕吗？请同时添加formMove require_once'../conf.php'；“直接到顶端。”弗雷格利把它移到顶端对我很有用。非常感谢您的帮助。@MaxMuster我知道表单工作正常，所以我没有添加它。我接受了您的回答。而且，这也有道理。非常感谢你的帮助。