Intelligent forms

[toplisek]

I like to set IF sentences based on different value inside forms.

Is there any solution to manage some kind of agreggate. In other words I like to manage
collection of items that are gathered together to form a result.

Example: If value is larger than 250 USD it will compare to form results like number of users and send an email to specific group. It is actually similar like bestbuy.com service.

How to do in the correct way?

[penders]

Are you referring to processing form submissions? Are you using vanilla PHP? (No framework or form controller?)

How to do in the correct way?

What's the wrong way? :)