所以我用php和mysql数据库做了一个登录成功的登录页面。我的代码成功地检查了用户名和密码，并且只允许我在正确后进入下一页。
但是，我无法在成功登录页面上打印用户名。所以我不确定我的会话是否正常运行。
登录.php
<!DOCTYPE HTML>
<html>
<?php
session_start();
?>
<head>
<title>Login</title>
</head>
<body>
<!--<form action ="SuccessfulLogin.php" method = "get"> --> // If I put this in my code, the whole program stops checking Username and Password, and just put me to the next page
<?php
//define variables and set to empty values
$nameErr = $loginErr = "";
$Username = $website = $Password = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["Username"])) {
$nameErr = "Name is required";
} else {
$Username = test_input($_POST["Username"]);
}
if (empty($_POST["Password"])) {
$passErr = "Password is required";
} else {
$Password = test_input($_POST["Password"]);
}
//continues to target page if all validation is passed
if ( $unameErr ==""&& $passErr ==""){
// check if exists in database
$dbc=mysqli_connect('localhost','testuser','password','Project')
or die("Could not Connect!\n");
$hashpass=hash('sha256',$Password);
$sql="SELECT * from Members WHERE Username ='$Username' AND Password='$hashpass';";
$result =mysqli_Query($dbc,$sql) or die (" Error querying database");
$a=mysqli_num_rows($result);
if ($a===0){
$loginErr="Invalid username or password";
}else{
$_SESSION["Username"]=$Username;
header('Location: /SuccessfulLogin.php');
}
}
}
// clears spaces etc to prep data for testing
function test_input($data){
$data=trim ($data); // gets rid of extra spaces befor and after
$data=stripslashes($data); //gets rid of any slashes
$data=htmlspecialchars($data); //converts any symbols usch as < and > to special characters
return $data;
}
?>
<h2 style="color:yellow" align="center"> Login </h2>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" align="center" style="color:#40ff00">
User Name: <input type="text" name="Username" value="<?php echo $Username;?>"/>
<span class="error">* <?php echo $unameErr;?></span>
<br/><br/>
Password:
<input type="text" name="Password" value=""/>
<span class="error">* <?php echo $passErr;?></span>
<br/><br/>
<span class="error">* <?php echo $loginErr;?></span>
<input type="submit" name="submit" value="Login"/>
</form>
<!--</form>--> // closing tag of form action SuccessfulLogin.php
</html>成功登录.php
<!doctype html>
<html>
<?php
session_start();
$Username=$_GET['Username'];
$_SESSION['Username']=$Username;
?>
<head>
<meta charset="utf-8">
<title>Login Form</title>
<link rel="stylesheet" href="RegisterLogin.css">
</head>
<body>
<!--<form action ="MemberMenu.php" method = "get">-->
<h2><?php echo "User $Username LOGGED IN"; ?></h2> // Doesn't print out the $Username
<p align="center"> <a href="MemberMenu.php"> Click here to be redirected to the menu page </a> </p>
<!--</form>-->
</footer>
</body>
</html>
3条答案
按热度按时间z0qdvdin1#
您需要检查会话是否已设置。
改变
具有
brqmpdu12#
更改这行代码
分为：
在这里阅读更多关于php会话的信息
vsdwdz233#
在本例中，您使用的$\u get[“username”]为空，然后将$\u session[“username”]设置为空变量。
这也是一种非常奇怪的用户身份验证方法。