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Retrieve session data after page forwarding using the header function

Posted on 2009-03-31
4
690 Views
Last Modified: 2012-05-06
I am trying to have persons register to my website and then have Welcome <name they registered with> on the next page.
I saved formation to a session as follows in the register.php page:
$_SESSION['username']= $username;

I then forwarded the user to the hello.php where they would be greeted with the welcome message as follows:
header('Location:hello.php');

Next, I tried to retrieve information from the session variable in the hello.php as follows:
$username = $_SESSION['username'];
echo $username;

However, the username did not appear. What am I doing wrong and how can I fix it?
See code below (register.php and hello.php).
.........................Hello.php............................

<?php

session_start();
 

$username = $_SESSION['username'];

echo $username;
 

echo 'Registration successful';

session_write_close();

?>
 
 
 

..........................................Register.php...................................................

<html>

<head>

<title>Registration form</title>

</head>
 

<body>
 

<h3>Registration Form</h3>
 

<?php

session_start();

define('SALT_LENGTH', 9);

if(isset($_POST['sendUsername']))

{

    $username = $_POST['username'];

    $password1 = $_POST['password1'];

    $password2 = $_POST['password2'];

    	if(empty($username))

   	{

      	echo "You haven't filled in username!<br/>";

    	}

    	if(empty($password1))

    	{

        	echo "You haven't filled in password!<br/>";

    	}

    	else if(!preg_match("/^[a-zA-Z0-9.,?_]+$/",$password1))

    	{

		echo "You have entered an invalid password!<br/>";

	}

	else if(strlen($password1)<5)

	{

		echo "Your password must be at least 5 characters long!<br/>";

	}

	if(empty($password2))

    	{

        	echo "You haven't retyped your password!<br/>";

     	}

	else if(!preg_match("/^[a-zA-Z0-9.,?_]+$/",$password2))

    	{

		echo "You have entered an invalid password!<br/>";

	}

	else if(strlen($password2)<5)

	{

		echo "Your password must be at least 5 characters long!<br/>";

	}

	else if($password1!=$password2)

	{

		echo "Your password must be the same!<br/>";

	}

	else

	{

		$dbServer = '127.0.0.1';

		$dbUser = 'alpha';

		$dbPass = 'qwerty';

		$dbName = 'myusers';
 

		$conn = mysql_connect($dbServer, $dbUser, $dbPass) or

			die('Error connecting to mysql' . mysql_error());

		$db = mysql_select_db($dbName, $conn) or

			die('Error selecting database' . mysql_error());

		$username = mysql_real_escape_string($username);

		$password = generateHash($password1);

		$query1 = "SELECT * FROM users WHERE username = '$username'";

		$result = mysql_query($query1);

		if (mysql_fetch_assoc($result)!=0)

		{

			echo "The user name entered is already taken";

		}

		else 

		{

			$query = "INSERT INTO users(username, passwordHash) VALUES('$username','$password')";

			//mysql_query($query);

			$_SESSION['username']= $username;

			header('Location:hello.php');

		}

		

		

		mysql_close($conn);

	}

}
 
 

function generateHash($plainText, $salt = null)

{

    if ($salt === null)

    {

        $salt = substr(md5(uniqid(rand(), true)), 0, SALT_LENGTH);

    }

    else

    {

        $salt = substr($salt, 0, SALT_LENGTH);

    }
 

    return $salt . sha1($salt . $plainText);

}

session_write_close();

?>
 

<p>
 

<form method="post" action="register.php">

<b>Username:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</b><input name="username" type="text" size="20"  value="<?php echo $username; ?>"><br/>

<b>Password:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</b><input name="password1" type="password" size="20"  value="<?php echo $password1; ?>"><br/>

<b>Retype password:</b><input name="password2" type="password" size="20"  value="<?php echo $password2; ?>"><p>

<input name="sendUsername" type="submit" value="submit">

</form>
 

</body>

</html>

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0
Comment
Question by:kgpretty
  • 2
4 Comments
 
LVL 39

Accepted Solution

by:
Roger Baklund earned 125 total points
ID: 24035053
In Register.php, you must call session_start() before you send any output to the browser. Start it like this:

<?php session_start(); ?>
<html>
<head>
<title>Registration form</title>
</head>
0
 

Author Comment

by:kgpretty
ID: 24035839
Where should lines 26 - 111 go?
0
 
LVL 2

Expert Comment

by:toymachiner62
ID: 24035858
I think they'll be alright. Just try putting line 25 at the very beginning
0
 

Author Closing Comment

by:kgpretty
ID: 31565124
Thanks
0

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