Help with Voting System (PHP)

Question

I am working on a voting system for my site, allowing users
to rate submissions.
On the submission page there is a voting meter (1-5) which is
actually five individual images side by side. Each one links the
user to the same page (index.php?page=submission&id=[id]) but
adds '&vote=[a number 1-5]' to the url. When the submission
page loads it checks if $_GET['vote'] is set and will take actions
accordingly. After these actions are taken I wanted to use the PHP
header function to reload the same page without the 'vote' variable
in the url, but I can't do this because the submission page is an
include on index.php, so it tells me the header has already been
set.
Obviously this method isn't going to work. Could someone tell
me a better way of doing this?

Answer 1

Q2) should the indexes be inserted before or after
inserting the document, or is this irrelevant?In the sense that this will not affect what the indexes contain, this is irrelevent. However, we normally recommend adding indexes before documents, or you would risk a lengthy re-index operation.
Q3) If I create the container from php as shown
before, and then I open it with dbxml it shows:
Type of default container: NodeContainer
Index Nodes: off
However if I create the container directly from dbxml
it
Type of default container: NodeContainer
Index Nodes: on
Why is that?This is a bug in the PHP API - it is also why your indexes made no difference for you. You will need to create your container outside PHP using DBXML_INDEX_NODES.
Q4) I need to repeat several times $mgr->query(....)
. Does this affect somehow the data base acces
performance?If the query is run several times, you would benefit from preparing it once, and executing it from the XmlQueryExpression object.
John