Can CodeIgniter help me do this?

[eluser]Mark Croxton[/eluser]
There will be a learning curve if you're not used to MVC frameworks, but the payoff is that you can leverage a large body of existing and high quality code; for example, CI's core form validation class. This alone will save you massive amounts of time.

And if you're going to learn a framework then CI is without doubt the easiest to get started with thanks to the excellent documentation.