Don't Want Page Skipping Ahead Or Going Back

I am creating an application on the browser but I do not want the user to skip pages while on certain pages in my browser. Think of this. If I want user to create something but for

Solution 1:

Your form will post back answers to your server. Your server must validate those answers. If the answers are valid, you should store them in the database. If the answers are invalid, you'll want to re-render the form, probably populated with the user's inputs, and display some kind of error, and repeat this process.

If the user's answers are valid, you'll write them to the database and redirect the user to the next page. On this next request, you can use the existence of answers for the first page to determine whether page 2 should be accessible. If not, you need to redirect them to the first page.

The extremely simplified logic within each page will look something like this:

• page1.php

  Do I have answers for page 1 questions?
    No: Render page 1 questions
    Yes: Redirect to page 2

• page2.php

  Do I have answers for page 1 questions?
    No: redirect to page 1
    Yes:
      Do I have answers for page 2 questions?
        No: Render page 2 questions
        Yes: Redirect to page 3

• page3.php

  Do I have answers for page 1 questions?
    No: redirect to page 1
    Yes:
      Do I have answers for page 2 questions?
        No: Redirect to page 2
        Yes: 
          Do I have answers for page 3 questions?
            No: Render page 3 questions
            Yes: Render "you are finished" page
  

Or more generally, each page should find the first page that doesn't have answers, and (if that's not the current page) redirect to that page.