PHP - MySQL 登录表单在提交后未重定向到登录页面

Question

I am trying to create a simple login form using php and mysql.我正在尝试使用 php 和 mysql 创建一个简单的登录表单。 My code does not display any errors so I suppose the login is successful however it does not redirect me to the next paged (dashboard.php).我的代码没有显示任何错误，所以我认为登录成功但是它不会将我重定向到下一页（dashboard.php）。 The sql script of my database table and my php code can be found below.我的数据库表的 sql 脚本和我的 php 代码可以在下面找到。

My login.php code我的登录名.php 代码

<?
include('header.php');
include('connect.php');


//Initialize the session
if (session_status() == PHP_SESSION_NONE) {
  session_start();
}

// Include config file
require_once "config.php";

// Check if the user is already logged in, if yes then redirect him to welcome page
if (isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true) {

  if ($_SESSION["type"] == "ADMIN") { //check usertype
    header("Location: dashboard.php"); //if normal user redirect to dashbord.php
    exit();
  } else if ($_SESSION["type"] == "ACCOUNTANT") {
    header("Location: dashboard.php"); //if accountant user redirect to empty.php
    exit();
  } else if ($_SESSION["type"] == "MANAGER") {
    header("Location: dashboard.php"); //if manager user redirect to admin.php
    exit();
  }
}


// Define variables and initialize with empty values
$username = $password = "";
$username_err = $password_err = "";

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

  // Check if username is empty
  if (empty(trim($_POST["username"]))) {
    $username_err = "Please enter 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 id, fname, username, password, type FROM users WHERE username = ?";

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

    // Set parameters
    $param_username = $username;

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

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

            if (session_status() == PHP_SESSION_NONE) {
              session_start();
            }

            // Store data in session variables
            $_SESSION["loggedin"] = true;
            $_SESSION["id"] = $id;
            $_SESSION["fname"] = $fname;
            $_SESSION["username"] = $username;
            $_SESSION["type"] = $type;

            // Redirect user to welcome page
            if ($_SESSION["type"] == "ADMIN") { //check usertype         
              header("Location: dashboard.php");
              exit();
            } else if ($_SESSION["type"] == "ACCOUNTANT") {
              header("Location: dashboard.php");
              exit();
            } else if ($_SESSION["type"] == "MANAGER") {
              header("Location: dashboard.php");
              exit();
            }
          } 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 "Something went wrong. Please try again later.";
    }

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

// Close connection
mysqli_close($link);
}

?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
    <link rel="stylesheet" href="assets/css/style.css">
</head>
<body>
    <div class="login-container">
        <div class="login-form">
            <h3>Login</h3>
            <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
        
              <div class="form-container">
                <label for="username">Username</label>
                <div class="input-container">
                  <input type="text" name="username" placeholder="username" class="text-input"/>
                  <img src="assets/img/svg/icon-user.svg" alt="user icon">
                </div>
              </div>
        
              <div class="form-container">
                <label for="password">Password</label>
                <div class="input-container">
                  <input type="password" name="password" placeholder="password" class="text-input"/>
                  <img src="assets/img/svg/icon-password.svg" alt="password icon">
                </div>
              </div>

              <div class="btn-container"> 
                <input type="submit" class="login-btn" value="Login">
              </div>
        
            </form>
          </div>
          
    </div>
    
</body>
</html>

My config.php code我的 config.php 代码

<?php
/* Database credentials. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_NAME', 'erp_system');
 
/* Attempt to connect to MySQL database */
$link = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);
 
// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
?>

My header.php code我的 header.php 代码

<?php
if (session_status() == PHP_SESSION_NONE) {
    session_start();
}
?>
<!DOCTYPE html>
<html lang="zxx">

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
    <link rel="stylesheet" href="assets/css/style.css">
</head>
<body>
<?php 
if (session_status() == PHP_SESSION_NONE) {
    session_start();
}
?>

My connect.php code我的 connect.php 代码

<?php
$servername = "localhost";
$username = "";
$password = "";
$dbname = "erp_system";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

Table SQL Scirpt表 SQL 脚本

CREATE TABLE `users` (
  `id` int(11) NOT NULL,
  `fname` varchar(45) NOT NULL,
  `username` varchar(45) NOT NULL,
  `password` varchar(45) NOT NULL,
  `type` varchar(45) NOT NULL,
  `created_at` date NOT NULL DEFAULT current_timestamp()
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

Answer 1

header("dashboard.php");

This should be:这应该是：

header("Location: dashboard.php");

https://www.php.net/manual/en/function.header.php https://www.php.net/manual/en/function.header.php

I am assuming you already (somewhere) have done validation etc to set the SESSION .我假设您已经（某处）已经完成验证等来设置SESSION 。

PHP - MySQL 登录表单在提交后未重定向到登录页面

问题描述

1 个解决方案

解决方案1
1 2021-04-12 21:33:40

PHP - MySQL 登录表单在提交后未重定向到登录页面

问题描述

1 个解决方案

解决方案1 1 2021-04-12 21:33:40

解决方案1
1 2021-04-12 21:33:40