HTTP Header with Location doesn't ID to the URL

I have a problem using a "header location", below is the code:

case 'update':
        updateUser($_GET['ticket_id']);
   开发者_如何学Python     header('Location: ../ticket/listOfTicket.php?ticket_id='.$_GET['ticket_id'].'');
        exit;
        break;

I'm using case because want to I update into a database. The problem here I believe is:

header('Location: ../ticket/listOfTicket.php?ticket_id='.$_GET['ticket_id'].'');

I don't know where to put the quote ' and ". It will outputted in the URL like this:

http://localhost/ticket/listOfTicket.php?ticket_id=

It didn't display the ticket_id. Why?

You should always sanitize your user input. I could easily pass something you're not expecting to $_GET['ticket_id']. Assuming ticket_id is an integer, this works for me when I access the page and set ticket_id to some value.

header( 'Location: ../ticket/listOfTicket.php?ticket_id=' . intval( $_GET['ticket_id']));
exit;