php get runs twice when connecting through proxy - php

Question

I have an issue where a php page which runs twice, but it only runs twice when connecting through a proxy server. This code runs fine if the user doesn't connect through a proxy.
How do I fix this so that it will only run once, whether connecting through a proxy or not?
This php code is running within a Drupal CMS page, but independent of Drupal. The user gets to this page by clicking on a hyperlink.
Is it that I am using header to redirect the user to another page?
<?php
$userId = 0;
$userId = $_GET["userId"];
$userEmail = 0;
$userEmail = $_GET["userEmail"];
$userName = 0;
$userName = $_GET["userName"];
//connect to the database
$con = mysql_connect("HOSTNAME","USERNAME","PASSWORD");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
else
{
//echo "Connected.";
//echo "<br>";
}
mysql_select_db("formredirectdata", $con);
$userId = intval($userId);
mysql_query("INSERT INTO webforms
(userid, formisactive, formname, formtitle, shortdesc, confirmationlink) VALUES('$userId', '1', 'Form Name', 'Form Title', 'Short Description', 'Confirmation Link') ")
or die(mysql_error());
$newformnum = mysql_insert_id();
$recipientname = 0;
$recipientemail = 0;
$recipientname = "default" . $newformnum;
$recipientemail = $userEmail;
//send to the next script
header('Location: addtriggernewform.php?formnum2=' . $newformnum . '&recipientemail=' . $recipientemail . '&operator=(default)&inputname=(default)&triggervalue=(default)&userName=' . $userName);
?>

Answer 1

I later found out that the reason the query was getting processed twice is that I was logged into the website (Drupal based) in two different browsers with different user accounts. After logging out in one of the browsers then the query no longer gets processed twice. This must be a quirk involving Drupal and temporary internet files.