php and xml

[sukanya.paul]

hi,
i have a form which when submitted should create an xml file with certain data being passed from the form.after that the xml file will be passed to an external url which should be able to collect the data from the xml file.
i have no idea how to do this.
Can some1 please help.
Thanks a lot.
Suk

[Snowcore]

What kind of external url?
On the same server?