Add command code to 3 existing PHP files in order to add a campaign name on 3 squeeze page creators

I have 3 squeeze pages with optin forms. Lets say they are located in [login to view URL] [login to view URL] [login to view URL] And I have 3 PHP squeeze page creators that work perfectly. They are located in [login to view URL] [login to view URL] [login to view URL] What these current creators already do, is, they allow the user to enter their autoresponder HTML optin form code, and it creates for them, a random URL which is a copy of the original squeeze page BUT with the USER’s optin form in this new squeeze page URL that looks like this : [login to view URL] WHAT I WANT YOU TO DO IS THIS: Add a command code in the 3 PHP creators that will ALSO make the optin form to save subscribers in a specific campaign name. This without interfering with the actions that the current creators already do.