Can someone suggest a Form Builder?

Hi everyone! I am using a WordPress MultiSite Network and I need a Form Builder that can allow me to use the data inputted into the form in a PHP script after submitted. Every plugin I’ve seen so far (FormCraft, Visual Form Builder, QuForm…) only allows you to store data into a database or email someone with the data. I need to be able to use the data in PHP, like $foo = $_POST[‘bar’];

I know that in QuForm you are able to send PHP data using this method, but I was hoping there was a plugin that would allow me to simply put in the URL to a php file instead of having to modify the functions.php file.

Is there anything like this with a drag and drop interface like FormCraft, etc. that anyone knows of? Otherwise I’ll be going with QuForm and the method I mentioned above. Thanks!