PHP autopost

How do I post data from a PHP script? Transparently for the user. He will fill in a form, then my PHP will retrieve some data from a database, and then I want to automaticaly submit user's data combined with some of the database's results to another page, using POST. Also, some of that data is sensible, so I can't just print it on the output html and just use some javascript to submit it.

How do I do that?

>>3
ok, that would do it, but unfortunately my server does not accept pfsockopen. Any other way of doing this? something like header() but for sending headers instead of setting them?

Thank you