Hi,

I want to fill some html forms automatically. I have all the required
details to enter into the form, but this should be posted automatically
to this site's form. I don't have any access to this particular site.

Is it possible with PHP ?

Any reply is greatly appreciated.

thank you.

Yes this is possible.
You can post the variables and get the result page.
For this you have to use curl with php.
http://in2.php.net/manual/en/ref.curl.php

Regards
Rajesh