login system not working...

cheesybiscuits · January 31, 2012

Hi, I made a login/register system and it was working fine, but now I seem to have broken it and I'm scratching my head as to why. I think it's something to do with the $_SESSION array, the error happens from going from the login.php page to members.php, I log in successfully, but when I get to the members page it says "you must be logged in".

index.php has the form to login or a link to register.php to make an account

<?php session_start(); ?>
<html>
<head>
<title>Lincs Crusade | Login page.</title>
</head>
<body>
<form action="login.php" method="POST">
	Username:
	<input type="text" name="username"><br />
	Password:
	<input type="password" name="password"><br />
	<input type="submit" value="Login">
</form>
<a href="register.php">Click here to register!</a>
</body>
</html>

The register.php page

<?php
session_start();
echo "<h2>Register</h2>";
$submit = $_POST['submit'];
$username = strip_tags($_POST['username']); 
$password = strip_tags($_POST['password']);
$repeatpassword = strip_tags($_POST['repeatpassword']);
$email = $_POST['email'];
$date = date("Y-m-d");

if ($submit) { 
	if ($username&&$password&&$repeatpassword&&$email) {
		if ($password==$repeatpassword) {
			if (strlen($username)>65) { 
				echo "Length of username is too long!"; 
			} elseif (strlen($email)>100) { 
				echo "Length of email is too long!";
			} elseif (strlen($password)>65||strlen($password)< {
				echo "Password must be between 8 and 65 characters long!"; 
			} else {
				include('functions.php'); 
				echo "All fields were accepted! ";
				$password = md5($password);
				$repeatpassword = ($repeatpassword);
				$email = md5($email);
				connect(); 
				mysql_query(" 
					INSERT INTO users VALUES ('','$username','$password','$email','$date') 
				") or die("Could not insert values into <em>users</em> table!");
				mysql_query("
					INSERT INTO stats VALUES ('$username',10,10,0,1)
				") or die("Could not insert values into <em>stats</em> table!");
				$_SESSION['username'] == $username;
				die("You have been registered! Please return to <a href=\"index.php\">homepage</a> and login."); 
			}
		} else {
			echo "Your passwords do not match!";
		}
	} else {
		echo "Please fill in <em>all</em> fields!";
	}

}
?>
<html>
<head>
<title>Lincs Crusade | Register an Account.</title>
</head>
<body>
<form action="register.php" method="POST">
	<p>Your username:</p>
	<p>Note: Do not use your real name.</p>
	<input type="text" name="username" value="<?php echo $username ?>"/>=
	<p>Choose a password:</p>

	<input type="password" name="password" />
	<p>Please repeat password:</p>
	<input type="password" name="repeatpassword" />
	<p>Your student email:</p>
	<p>Note: This is only used for recovering a lost or forgotten password.</p>
	<input type="text" name="email" /><br />
	<input type="submit" value="Register" name="submit" />
	<p>
		Note: Your password and email are md5 encrypted. This means neither I (the author) or anyone else will be able to view your information<br />
		in plain text. For example, your password or email will look something like this "534b44a19bf18d20b71ecc4eb77c572f" once it has been encrypted.
	</p>
</form>
</body>
</html>

The login.php page that process the form data to access members.php page

<?php
session_start();
$username = $_POST['username'];
$password = $_POST['password'];
if ($username&&$password) {
	include('functions.php');
	connect();
	$query = mysql_query("SELECT * FROM users WHERE username='$username'");
	$numrow = mysql_num_rows($query); 
	if ($numrow!=0) { 
		while ($row = mysql_fetch_assoc($query)) {
			$dbusername = $row['username'];
			$dbpassword = $row['password'];
		}
		if ($username==$dbusername&&md5($password)==$dbpassword) { 
			echo "You're in! - <a href=\"members.php\">Proceed to the members page</a>";	
			$_SESSION['username'] == $username; 	
		} else {
			echo "Incorrect password!";
		}
	} else {
		die ("That user doesn't exist,<a href=\"register.php\">please register an account</a>");
	}	
} else {
	die("Please enter a username and password!");
} 
?>

The members.php page

<?php 
session_start();
?>
<html>
<head>
<title>Lincs Crusade | Members page.</title>
</head>
<body>
<?php	
	if ($_SESSION['username']) {
		echo "Welcome," .$_SESSION['username']. "!<br />";
		echo "<a href=\"stats.php\">View your stats.</a>";
	} else {
		die ("You must be logged in.");
	}
?>
</body>
</html>

and this is what is in the functions.php file

<?php
function connect() {
    mysql_connect("localhost","root","password") or die ("Unable to connect");
	mysql_select_db("database") or die ("Unable to find database");
}
?>

Thanks for your help.

scootstah · January 31, 2012

In your login script you are trying to assign $_SESSION['username'] using ==, which is a comparison operator.

So change

$_SESSION['username'] == $username;

To

$_SESSION['username'] = $username;

cheesybiscuits · January 31, 2012

Well isn't my face red thanks scootstah saved me a lot of frustration

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