If your task is to upload a huge data-set or process it on the server, while updating progress to the server you should consider going with some sort of jobs architecture, where you initiate the job and do it with some other script running on the server (for example scaling / processing images etc).

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That being said, implementing Web Sockets may be impractical for achieving just this one particular solution. chunked encoding would require you to make a update for every step you do on the server while you process the data.
You will only need to update the values when you want to notify the user. if you process You should no only link again external sites, as they could go away, but summarize the techniques, so that a reader will get at least a rough idea about them.
Websites with AJAX elements are a defacto standard on the web and have been for quite some time.
AJAX allows you to run a request on the server without actually leaving the page the user is on, executing it asynchronously while the browser waits for a response.
This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at
The W3C HTML Working Group is the W3C working group responsible for this specification's progress.However the PHP script still runs and the user will have at least some sort of feedback once the script completes.XHR DEMO This technique is a little older and not really elegant but works even in IE 8.For simple projects, then, web sockets function, which will only output to the browser every N bytes (usually 1024 bytes by default, but may be more or less depending on your server settings).This is something that can be changed, but not easily, and certainly not easily on shared hosting environments.If you are doing multiple files or multiple things in the task, you may also want to handle that logic in this step Do the job & Return the progress.