Can i work with SESSIONS?

Question

I just tried to work with session. I get errors like session already started, you don't have permission to write.. Is it possible to do a simple script with SESSIONS? (i tried to do something where if you don't have username session than it will show a simple post form, but it don't work..)

Answer 1

I also tried it and seems sessions cant be declared on sololearn's editor. Here is a code that should work in anothrer coding enviromment, just dont forget to declare session_start before anything else.
https://code.sololearn.com/wOKJRHkKrceR/?ref=app

Answer 2

It's because the forms fails... Just try to do $_GET or POST... But it seems like it's using online tool so it cannot assign sessions because of you can cheat usernane session...