Hi I'm having problems trying to redirect to another page using php. My code is pure php - no html before the script but I keep getting errors. The code is:
<?php
session_start(); // start the session

$errorMessage = '';
if (isset($_POST['userName']) && isset($_POST['pWord'])) {
   ob_start();
   include 'library/config.php';
   include 'library/opendb.php';
   $userId = $_POST['userName'];
   $password = $_POST['pWord'];
   // check if the user id and password combination exist in database
   $sql = "SELECT userId FROM auth_user WHERE userId = '$userId' AND userPWord = '$password'";
   $result = mysql_query($sql) or die('Query failed. ' . mysql_error());
    // if the user id and password match, 1 row at least will be returned
    if (mysql_num_rows($result) == 1) {
     // set the session
      $_SESSION['db_is_logged_in'] = true;
      // after login we move to the main page
       ob_end_flush();
      header('Location:http://localhost/morindacards/mainAmend.php');
//echo "we're in";
      exit;
   }
   else{
      $errorMessage = 'Sorry, wrong user id / password ';
      $echo $errorMessage;
   }
   include 'library/closedb.php';
}
?>

the errors are:

Warning: Cannot modify header information - headers already sent by (output started at c:\Inetpub\wwwroot\...

Can anyone help? This is driving me nuts.
G

i've found the answer - for anyone who's looking.

insert
ob_start(); at the beginning of the script to buffer the output and
ob_clean();before you want to redirect!
It's finally working!!

It'll be best, if you learn to write code ( rethink logic, loops, structure ) without buffering :D
http://www.mediasworks.com/literature/

that's helpful anshul. Thank you very much