Print out post values
For extra credit, I always have:
function pre($data) {
print '<pre>' . print_r($data, true) . '</pre>';
}
Whenever I need to debug an array - which is very often - I just do pre($arr); to get a nicely formatted dump.
You should be able to do a var_dump($_REQUEST);
http://us2.php.net/manual/en/reserved.variables.request.php
http://us2.php.net/manual/en/function.var-dump.php