For unlimited requests the dutch registry requires us to connect to their whois db with the following command:

whois -h 'is'

(we have to use the 'is' command)

Now I want to use php to do this, but I don't want the output directly to the browser, I want to store it in a string and filter it.

How can I do this?

If I use system or passthru then the result is stored to the browser no matter what I try.

Any ideas?