<?php
if ($_GET['p'])
{
$tUrl = $_GET['p'];
$rUrl = $_GET['r']; //Referer
if ( empty($rUrl) ) {
$rUrl = $tUrl;
}
<?php
if ($_GET['p'])
{
$tUrl = $_GET['p'];
$rUrl = $_GET['r']; //Referer
if ( empty($rUrl) ) {
$rUrl = $tUrl;
}