当我将数据输入表单时，它不会重定向到success.php，我似乎看不到我在做什么错。重定向应该在验证用户名和密码后发生，在这种情况下为$ username＆$ password。如果我还要设置一个PHP函数来使用数据库中的登录详细信息验证登录凭据，我将如何做呢？
<!DOCTYPE html>
<html>
<head>
<title>Bookstore</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="view/stylesheet/loginstyle.css">
</head>
<body>
<div class="popup">
<div class="access">
<form action="controller/processlogin.php" method="post">
<legend>Sign In</legend>
<input class="form-control" type="text" name="username" placeholder="Username">
<input class="form-control" type="password" name="password" placeholder="Password">
<input class="btn btn-primary mb-2" type="submit" name="">
</form>
</div>
</div>
</body>
</html>
<?php
session_start();
//Check if session varible is true, if session varible is true it will redirect to specified page//
$password = "1";
$username = "2";
if (isset($_SESSION['logged_in']) && $_SESSION['logged_in'] == true) {
header("Location: success.php");
}
if (isset($_POST['username']) && isset($_POST['password'])) {
if ($_POST['username'] == $username && $_POST['password'] == $password) {
$_SESSION['logged_in'] = true;
header("Location: success.php");
}
}
?>
在您的代码中发现一个非常严重的错误，
您的表单操作具有页面网址，因此来自表单的所有请求都将转到该页面。我从表单动作中删除了controller/processlogin.php的动作网址，
只需尝试一下。
<!DOCTYPE html>
<html>
<head>
<title>Bookstore</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="view/stylesheet/loginstyle.css">
</head>
<body>
<div class="popup">
<div class="access">
<form action="" method="post">
<legend>Sign In</legend>
<input class="form-control" type="text" name="username" placeholder="Username">
<input class="form-control" type="password" name="password" placeholder="Password">
<input class="btn btn-primary mb-2" type="submit" name="">
</form>
</div>
</div>
</body>
</html>
<?php
session_start();
//Check if session varible is true, if session varible is true it will redirect to specified page//
$password = "1";
$username = "2";
if (isset($_SESSION['logged_in']) && $_SESSION['logged_in'] == true) {
header("Location: success.php");
}
if (isset($_POST['username']) && isset($_POST['password'])) {
if ($_POST['username'] == $username && $_POST['password'] == $password) {
$_SESSION['logged_in'] = true;
header("Location: success.php");
}
}
?>