<?php
session_start();
$key = ini_get("session.upload_progress.prefix") . $_GET["key"];
if (!empty($_SESSION[$key])) {
$current = $_SESSION[$key]["bytes_processed"];
$total = $_SESSION[$key]["content_length"];
echo $current < $total ? ceil($current / $total * 100) : 100;
}else{
echo 100;
}