creed3

I second writing to a csv file and this usually works. Recently I was having an issue with this very thing, where the result had cells with commas. No amount of trying to force various breaks between data cells would allow me to import into a spreadsheet without those commas …

If you only need to save the data for the time the user is on that page or site you could always set [session variables](https://www.w3schools.com/php/php_sessions.asp). But as Dani answered, once the user closes their browser or the session times out the data will be gone without it being in a …

What you're wanting to do requires javascript, such as the onclick or onselect event handlers which would then trigger a function to manipulate your other form fields. PHP is not capable of doing this.