PHP Redirect to another page after form submit

Question

I have read all your posts about inserting headers into a php form file in order to redirect the user to another URL AFTER the form is submitted - but I can't figure out how to do it. Below is my code. Can you show me where to put the header/redirect so that the information gets e-mailed and then the user goes to another html page?

    <?php
    if(isset($_POST['email'])) {

    // EDIT THE 2 LINES BELOW AS REQUIRED
    $email_to = "[email protected]";
    $email_subject = "Mailing List Form";

    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you
       submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
        die();
    }

   // validation expected data exists
    if(!isset($_POST['first_name']) ||
        !isset($_POST['last_name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['telephone']) ||
        !isset($_POST['company']) ||
        !isset($_POST['street']) ||
        !isset($_POST['city']) ||
        !isset($_POST['state']) ||
        !isset($_POST['zip'])) {
        died('We are sorry, but there appears to be a problem with the form you 
    submitted.');      
    }

    $first_name = $_POST['first_name']; // required
    $last_name = $_POST['last_name']; // required
    $email_from = $_POST['email']; // required
    $telephone = $_POST['telephone']; // required
    $company = $_POST['company']; // required
    $street = $_POST['street']; // required
    $city = $_POST['city']; // required
    $state = $_POST['state']; // required
    $zip = $_POST['zip']; // required

    $error_message = "";
    $string_exp = "/^[A-Za-z0-9 .'-]+$/";
  if(!preg_match($string_exp,$first_name)) {
    $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$last_name)) {
    $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
  }  
    $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}$/';
  if(!preg_match($email_exp,$email_from)) {
    $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$company)) {
    $error_message .= 'The Company you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$street)) {
    $error_message .= 'The Street you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$city)) {
    $error_message .= 'The City you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$state)) {
    $error_message .= 'The State you entered does not appear to be valid.<br />';
  }
  if(!preg_match($string_exp,$zip)) {
    $error_message .= 'The Zip Code you entered does not appear to be valid.<br />';
  }
  if(strlen($error_message) > 0) {
    died($error_message);
  }
    $email_message = "Response from Mailing List Page.  Please enter in database.

";

    function clean_string($string) {
      $bad = array("content-type","bcc:","to:","cc:","href");
      return str_replace($bad,"",$string);
    }

    $email_message .= "First Name: ".clean_string($first_name)."
";
    $email_message .= "Last Name: ".clean_string($last_name)."
";
    $email_message .= "Email: ".clean_string($email_from)."
";
    $email_message .= "Telephone: ".clean_string($telephone)."
";
    $email_message .= "Company: ".clean_string($company)."
";
    $email_message .= "Street: ".clean_string($street)."
";
    $email_message .= "City: ".clean_string($city)."
";
    $email_message .= "State: ".clean_string($state)."
";
    $email_message .= "Zip: ".clean_string($zip)."
";


// create email headers
$headers = 'From: '.$email_from."
".
'Reply-To: '.$email_from."
" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);

?>

<!-- include your own success html here -->

Thanks for subscribing to our mailing list



<?php
}
?>

Answer 1

Right after @mail($email_to, $email_subject, $email_message, $headers);

header('Location: nextpage.php');

Note that you will never see 'Thanks for subscribing to our mailing list'

That should be on the next page, if you echo any text you will get an error because the headers would have been already created, if you want to redirect never return any text, not even a space!