Simple PHP Login Script Problem

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#1

Hey,

I am trying to use this simple php login script and it returns some error on row 6 ("if ($_SESSION["valid_user"])
" row. It does however login properly, with right user and email ofcourse but returns the error

"Notice: Undefined index: valid_user in c:\server\htdocs\login.php on line 6"

Any master php dev up for fixing this in a sec

Heres the login.php code, im using 3 more php files ( reg.php, welcome.php, logout.php)

<?php
session_start();
// This part sets up the connection to the
// database (so you don't need to reopen the connection
// again on the same page).
if ($_SESSION["valid_user"])
{
// User not logged in, redirect to login page
Header("Location: welcome.php");
}
// is selected.
if (isset($_POST['submit']))
{
$name = $_POST['name'];
$email = $_POST['email'];

$file = file_get_contents("data.txt");
if(strstr($file, "$name||$email"))
{

$_SESSION["valid_user"] = $_POST["name"];
$_SESSION["valid_time"] = time();

// Redirect to member page
Header("Location: welcome.php");
}
else
{
// Login not successful
print '<script> alert ("Sorry! You have entered a Invalid Login Id or Password."); window.location="login.php"; </script>';
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Login Page Test Script.</title>
</head>

<body>
<form method="post" action="login.php" >
enter name:
<input type="text" name="name" />
<br/>
<br/>
enter email:
<input type="text" name="email" />
<br/>
<br/>
<input type="submit" value="login" name="submit"/>
</form>
</body>
</html>