POST on redirects?

In a couple of my scripts, I do something like the following when I detect an improperly submitted form:

**    if( !valid_string( $_POST['firstname'] ) )

{

     $return_url =

"https://www.abc.com/checkout_phase1.php?error=FirstName Required";

     header( "location: $return_url" );
     exit(0);

} Recently I changed the code so that a big variable that was being passed via GET (IE, as a param in the URL) is instead being POST'd... (typically, via a hidden INPUT elem in a form)... Unfortunatley, this broke my error handling logic... Is it possible to add POST variables to a redirect? How? -- Free Linux Technical Articles http://www.linuxtecharticles.com