performance - How to detect internet speed in PHP?

Question

How can I create a PHP page that will detect the user's internet speed and show it on the page? Something like,

Your internet speed is ??? Kbps

Answer 1

This might not be completely what you're looking for (read the bold part), but I doubt if anything else is possible.

This script sends 512 KB of HTML comments to your client. Parsing that HTML may add to the total transfer time, so don't take this as your raw download speed.

Quoted from: PHP Speed test

Source is here:

http://jan.moesen.nu/code/php/speedtest/index.php?source=1

Hope that helps.