PHP - form action calling itself, how to display everything in 1 page?

Question

I have two .php files as such:

test1.php

Answer 1

This one is fully tested and allows you to revise the value after submission. You still have to worry about cross-site scripting attacks, etc... but that is outside of the scope of the question.

    


    
    
You have chosen 
    
    
    Please enter a number