Solved

Retrieve session data after page forwarding using the header function

Posted on 2009-03-31
4
712 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>

Open in new window

0
Comment
Question by:kgpretty
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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

Featured Post

Enroll in July's Course of the Month

July's Course of the Month is now available! Enroll to learn HTML5 and prepare for certification. It's free for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Password hashing is better than message digests or encryption, and you should be using it instead of message digests or encryption.  Find out why and how in this article, which supplements the original article on PHP Client Registration, Login, Logo…
There are times when I have encountered the need to decompress a response from a PHP request. This is how it's done, but you must have control of the request and you can set the Accept-Encoding header.
The viewer will learn how to count occurrences of each item in an array.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question