首先，非常感谢@NBK指出了我的password_verify问题。 我通读了他们提供的两篇推荐文章， 如何使用PHP的password_hash哈希和验证密码（7个答案） 参考-此错误在PHP中意味着什么？ （36个回答）
A，我仍然在trinasgame.joshuasplace2018.com/game/login.php上的登录表单存在问题，其中，一旦登录，就应该重定向到一个超级简单的index.php页面，该页面应显示“嗨” ，[昵称]。欢迎光临本站！但是，此时，如果您尝试登录页面，则只会踢出您的信息。
最初，我对与语法有关的问题很有信心，但我仍在努力找出错误的确切原因。已启用错误日志记录，但未看到生成任何错误，因此使用创建登录表单的步骤1 + 2从https://www.tutorialrepublic.com/php-tutorial/php-mysql-login-system.php中提取了代码。
登录页面代码如下
<?php
session_start();
require 'dbt.php';
// Check if the nick is already logged in, if yes then redirect him to welcome page
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){
header("location: index.php");
exit;
}
// Define variables and initialize with empty values
$nickname = $password = "";
$nickname_err = $password_err = "";
// Processing form data when form is submitted
if($_SERVER["REQUEST_METHOD"] == "POST"){
// Check if nickname is empty
if(empty(trim($_POST["nickname"]))){
$nickname_err = "Please enter nickname.";
} else{
$nickname = trim($_POST["nickname"]);
}
// 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($nickname_err) && empty($password_err)){
// Prepare a select statement
$sql = "SELECT * FROM `players` WHERE nickname = ?";
if($stmt = mysqli_prepare($conn, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "s", $param_nickname);
// Set parameters
$param_nickname = $nickname;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($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, $id, $nickname, $password);
if(mysqli_stmt_fetch($stmt)){
if(password_verify($password, BCRYPT)){
// Password is correct, so start a new session
session_start();
// Store data in session variables
$_SESSION["loggedin"] = true;
$_SESSION["id"] = $id;
$_SESSION["nickname"] = $nickname;
// Redirect user to welcome page
header("location: index.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
$username_err = "No account found with that username.";
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
// Close statement
mysqli_stmt_close($stmt);
}
}
// Close connection
mysqli_close($conn);
}
?>
<html>
<head>
<title>Login Page</title>
<style type = "text/css">
body {
font-family:Arial, Helvetica, sans-serif;
font-size:14px;
}
label {
font-weight:bold;
width:100px;
font-size:14px;
}
.box {
border:#666666 solid 1px;
}
</style>
</head>
<body bgcolor = "#FFFFFF">
<div align = "center">
<div style = "width:300px; border: solid 1px #333333; " align = "left">
<div style = "background-color:#333333; color:#FFFFFF; padding:3px;"><b>Login</b></div>
<div style = "margin:30px">
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
<div class="container">
<label for="nickname"><b>Nickname</b></label>
<input type="text" placeholder="Nickname" name="nickname" required>
<label for="password"><b>Password</b></label>
<input type="password" placeholder="Enter Password" name="password" required>
<button type="submit">Login</button>
<label>
<input type="checkbox" checked="checked" name="remember"> Remember me
</label>
</div>
<div class="container" style="background-color:#f1f1f1">
New here? <a href="register.php">Register!</a>
<button type="button" class="cancelbtn">Cancel</button>
<span class="psw">Forgot <a href="#">password?</a></span>
</div>
</form>
<div style = "font-size:11px; color:#cc0000; margin-top:10px"><?php echo $error; ?></div>
</div>
</div>
</div>
</body>
</html>
索引页
require 'dbt.php';
session_start();
// Check if the user is logged in, if not then redirect him to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
header("location: login.php");
exit;
}
?>
<html>
<head>
<meta charset="us-ascii"><script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script><script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
<style type="text/css">p {
font-size: 15px;
}
p#login {
border: 1px black;
}
</style>
<link crossorigin="anonymous" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" rel="stylesheet" />
<title>Trina's G-o-R | Dev mode</title>
</head>
<body>
<div class="container">
<div class="wrapper">
<div class="content">
<h2>Index/Game home page</h2>
<p>Hi, <b><?php echo htmlspecialchars($_SESSION["nickname"]); ?></b>. Welcome to the site! </p>
<br/>
<!-- button onclick="rndInt()">Roll Dice</button>
<br/>
<div>
<p class="label">Latest roll: <span id="last_roll"></span></p>
</div-->
</div>
</div>
</div>
<h2><a href = "logout.php">Sign Out</a></h2>
</body>
</html>
答案 0 :(得分：0)
重定向时呼叫exit()：
// Redirect user to welcome page
header("location: index.php");
exit();