Create local.xml file with customible fields using PHP?

programming
1

I just went through http://www.kirupa.com/web/php_contact_form.htm and its basicly what I need with a litle modification. Can someone tell me what to change that I will receive local.xml or local.txt file in some folder on my server. Basicly I need php that will create

local.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
    <kursna>
        <sometext>[text that I put in field 1</sometext>
        <sometext2>[text that I put in field 2</sometext2>
        ...
    </kursna>

Thanks,
S@