Problem with header() function

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Am new to php and currently developing simple login site.  Information can be entered and input to the mySQL database and retrieved from the database.  However when I use the header function it does not appear to redirect to the required page.  All I see are blank pages which should contain information.  The URL in the browser doesn't change either.  Have tested in both safari and firefox browsers as using a mac. 

 

Have tried using an absolute URL as follows:

 

<?phpheader('Location: http://www.ab-productions.co.uk/tvts/thanks2.php');header("Content-Length: 0");?>

 

and also the $_SERVER superglobal - this page should redirect to loggedin.php:

<?php # Script 9.1 - login.php
// Send NOTHING to the Web browser prior to the setcookie() lines!

// Check if the form has been submitted.
if (isset($_POST['submitted'])) {

require_once ('../../mysql_connect.php'); // Connect to the db.
  
$errors = array(); // Initialize error array.

// Check for an email address.
if (empty($_POST['email'])) {
  $errors[] = 'You forgot to enter your email address.';
} else {
  $e = escape_data($_POST['email']);
}

// Check for a password.
if (empty($_POST['password'])) {
  $errors[] = 'You forgot to enter your password.';
} else {
  $p = escape_data($_POST['password']);
}

if (empty($errors)) { // If everything's OK.

  /* Retrieve the user_id and first_name for 
  that email/password combination. */
  $query = "SELECT user_id, first_name FROM production WHERE email='$e' AND password=SHA('$p')";  
  $result = @mysql_query ($query); // Run the query.
  $row = mysql_fetch_array ($result, MYSQL_NUM); // Return a record, if applicable.

  if ($row) { // A record was pulled from the database.
    
   // Set the cookies & redirect.
   setcookie ('user_id', $row[0]);
   setcookie ('first_name', $row[1]);

   // Redirect the user to the loggedin.php page.
   // Start defining the URL.
   $url = 'http://' . $_SERVER['HTTP_HOST'] . dirname($_SERVER['PHP_SELF']);
   // Check for a trailing slash.
   if ((substr($url, -1) == '/') OR (substr($url, -1) == '\\') ) {
    $url = substr ($url, 0, -1); // Chop off the slash.
   }
   // Add the page.
   $url .= '/loggedin.php';
   
   header("Location: $url");
   exit(); // Quit the script.
    
  } else { // No record matched the query.
   $errors[] = 'The email address and password entered do not match those on file.'; // Public message.
   $errors[] = mysql_error() . '<br /><br />Query: ' . $query; // Debugging message.
  }
  
} // End of if (empty($errors)) IF.
  
mysql_close(); // Close the database connection.

} else { // Form has not been submitted.

$errors = NULL;

} // End of the main Submit conditional.

// Begin the page now.
$page_title = 'Login';
include ('./includes/header.html');

if (!empty($errors)) { // Print any error messages.
echo '<h1 id="mainhead">Error!</h1>
<p class="error">The following error(s) occurred:<br />';
foreach ($errors as $msg) { // Print each error.
  echo " - $msg<br />\n";
}
echo '</p><p>Please try again.</p>';
}

// Create the form.
?>
<h2>Login</h2>
<form action="login.php" method="post">
<p>Email Address: <input type="text" name="email" size="20" maxlength="40" /> </p>
<p>Password: <input type="password" name="password" size="20" maxlength="20" /></p>
<p><input type="submit" name="submit" value="Login" /></p>
<input type="hidden" name="submitted" value="TRUE" />
</form>
<?php
include ('./includes/footer.html');
?>

 

Anyone any idea what I'm doing wrong??

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[DEVILofDARKNESS]

This has nothing todo with the installation/configuration off php...

 

If you get the error: headers are already sent by ...

The browser couldn't sent the headers because there already was outputted something like an echo command.

 

If you don't get it:

I think it should be:

header('Location: ' . $url);