PHP variable redirect to external website?

Hello everyone I want to send a variable into a redirect page? I was using the code below but with no luck. + Rep, for the first person that posts a solution.

Here's my code.

<?php
header( 'Location: http://www.domain.com/<?php echo str_replace("\\", "", $_GET[id]); ?>">' ) ;
?>

PHP:

I also made this code by it's not working either?

<?php

$id = $_GET['id'];

header('Location: 'http://www.domain.com/[$id]');

?>

PHP:

 

This isn't tested, but try:

<?php
header( 'Location: http://www.domain.com/'.str_replace("\\", "", urlencode($_GET['id'])));
?>

PHP:

 

Yes that works, +Rep!