modifying the POST data sent to a limited PHP form

I am using a CMS-like system, phpBMS, which defines certain fields and ways to generate a form.

Here is the sample form provided. It is possible to include javascript files and incorporate script into the form as well.

I would like to know if it is possible, within the confines of the framework I am working with, to send additional data back via POST, and to make use of it in the php form.

Going by the example there does not seem to be anywhere I could read in the new POST data and make use of it.

Ideally, I would like to modify how the POST data is treated when it comes back. However I am not sure if I can do that without modifying the code for the entire framework.

Any suggestions would be most welcome.

edit:

If I use print_r(_POST);, this is the outputI get

Array ( [chooseguests] => :08490ea8-d654-1c91-cb82-00d44a4b093b [ds-chooseguests] => Holmes, Sherlock [chooseproducts] => 75c72a6a-83d9-11df-951a-fa9c1ec271f2 [ds-chooseproducts] => Corona [quantity] => 2 [type] => cash [receiptno] => 7 [createdby] => [creationdate] => [command] => save [modifiedby] => [cancelclick] => 0 [modifieddate] => [uuid] => :4402add3-b884-43e6-04ad-c76d92ee465b [id] => )

What I want to do is take the value of [ds-chooseguests], i.e.开发者_开发技巧 in this instance "Holmes, Sherlock" and split it into two parts, so i can insert holmes into a lastname field and sherlock into a firstname field.

I am unsure how to go about this without making modifications to the actual framework...

Create new form fields using the framework code and set it from the server. Then those fields will get picked up in the form data that is sent back and you can process from php.