I checked a few websites related to this topic but I could not find anything to start with ?
http://ditio.net/2008/08/06/detect-connection-speed-with-javascript/

http://www.emanueleferonato.com/2006/05/31/determine-connection-speed-with-php/

Using any of these is not giving the right result !!
What should I do ?

Please help!

Sorry for the wrong question .... what I intended was:
Is it possible to measure correct internet connection speed using PHP?

What is your definition of "correct internet connection speed" ?