Form Validation

I'm not too happy with the form validation call back function, and it feels as if I'm working against it for some specific cases.

Let's say I have four $_POST fields...

But I want to validate if it is valid by passing ALL four into a function and determining if it is good or not.

Can I do this?

At the moment each post field has a callback function.

I would like so that you pass all four into one function, and then if failed repopulate the form.

I can't think of a way around this so I am probably mis-using the flash data to achieve this.

Any pointers most welcomed.

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