How to control a form fetched with curl

[cipango]

Hi, I'm fetching some forms with curl, in order to fill in. The form uses POST and is displayed in the browser. That's where I try to fill it.
1. one question is, how do I read the form's fields (need some hidden values to pass back)? can I use $_POST (this didn't seem to work much, so I used domdocument to get to the fields' values. This works fine on my computer, but my webhost doesn't have php 5 yet, so domdocument doesn't work)? what other way there is?
2. another related question is, how do I detect the submit button is clicked and then submit the form?

[sarahk]

Check out the curl page at php.net: http://www.php.net/curl there are some good examples.

Most pages where you post are probably "known" and you've written your script specifically for that type of page. You would need to do some ereg work if you were just scanning for forms to submit to.