Note: Please check out this updated tutorial for creating an upload progress bar. This tutorial is outdated and may not produce the desired effect.
Introduction
In this tutorial I will explain how to create a progress bar for PHP file uploads. There is no method built into PHP for returning the status of an upload in progress, so this requires a module called the Alternative PHP Cache (APC). This allows you to store data across sessions and includes built-in functionality for storing/returning file upload stats.
