1
我遇到了一個麻煩的世界，試圖讓我登錄的帳戶訪問我的網站。我使用PHP來記錄在樹莓派上訪問SQL數據庫。它正在工作。我可以做賬;但是，我無法登錄到它們。無法使用PHP在mySQL上登錄帳戶
我使用的代碼here
我調整了名稱，但大部分是相同的。至於我的名爲Users的數據庫，它只是一個名爲users的表中的ID（int），用戶名（varchar）和密碼（char）。這是我的登錄頁面的代碼，將信息發送到login_submission。
這裏是登錄頁面
<html>
<head>
<title>Login</title>
</head>
<body>
<h2>Login Here</h2>
<form action="login_submit.php" method="post">
<fieldset>
<p>
<label for="username">Username</label>
<input type="text" id="username" name="username" value="" maxlength="20" />
</p>
<p>
<label for="password">Password</label>
<input type="text" id="password" name="password" value="" maxlength="20" />
</p>
<p>
<input type="submit" value="Login" />
</p>
</fieldset>
</form>
</body>
</html>
這裏是Login_submission頁：
<?php
/*** begin our session ***/
session_start();
/*** check if the users is already logged in ***/
if(isset($_SESSION['user_id']))
{
$message = 'Users is already logged in';
}
/*** check that both the username, password have been submitted ***/
if(!isset($_POST['username'], $_POST['password']))
{
$message = 'Please enter a valid username and password';
}
/*** check the username is the correct length ***/
elseif (strlen($_POST['username']) > 20 || strlen($_POST['username']) < 4)
{
$message = 'Incorrect Length for Username';
}
/*** check the password is the correct length ***/
elseif (strlen($_POST['password']) > 20 || strlen($_POST['password']) < 4)
{
$message = 'Incorrect Length for Password';
}
/*** check the username has only alpha numeric characters ***/
elseif (ctype_alnum($_POST['username']) != true)
{
/*** if there is no match ***/
$message = "Username must be alpha numeric";
}
/*** check the password has only alpha numeric characters ***/
elseif (ctype_alnum($_POST['password']) != true)
{
/*** if there is no match ***/
$message = "Password must be alpha numeric";
}
else
{
/*** if we are here the data is valid and we can insert it into database ***/
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$password = filter_var($_POST['password'], FILTER_SANITIZE_STRING);
/*** now we can encrypt the password ***/
$password = sha1($password);
/*** connect to database ***/
/*** mysql hostname ***/
$mysql_hostname = 'localhost';
/*** mysql username ***/
$mysql_username = 'root';
/*** mysql password ***/
$mysql_password = 'raspberry';
/*** database name ***/
$mysql_dbname = 'Users';
try
{
$dbh = new PDO("mysql:host=$mysql_hostname;dbname=$mysql_dbname", $mysql_username, $mysql_password);
/*** $message = a message saying we have connected ***/
/*** set the error mode to excptions ***/
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
/*** prepare the select statement ***/
$stmt = $dbh->prepare("SELECT user_id, username, password FROM users
WHERE username = :username AND password = :password");
/*** bind the parameters ***/
$stmt->bindParam(':username', $username, PDO::PARAM_STR);
$stmt->bindParam(':password', $password, PDO::PARAM_STR, 40);
/*** execute the prepared statement ***/
$stmt->execute();
/*** check for a result ***/
$user_id = $stmt->fetchColumn();
/*** if we have no result then fail boat ***/
if($user_id == false)
{
$message = 'Login Failed';
}
/*** if we do have a result, all is well ***/
else
{
/*** set the session user_id variable ***/
$_SESSION['user_id'] = $user_id;
/*** tell the user we are logged in ***/
$message = 'You are now logged in';
}
}
catch(Exception $e)
{
/*** if we are here, something has gone wrong with the database ***/
$message = 'We are unable to process your request. Please try again later"';
}
}
?>
<html>
<head>
<title>PHPRO Login</title>
</head>
<body>
<p><?php echo $message; ?>
</body>
</html>
任何幫助是極大的讚賞。謝謝！
'mysql'在本地主機上運行？你嘗試沒有密碼？ – chriz
你看到了什麼錯誤？這會有很大的幫助。 –
請給出你得到的錯誤。謝謝 – Thomas